为您找到与九年级方差公式相关的共491个结果:
三年级数学是个坎,要想孩子数学好,首先帮他打好基础,那么三年级数学知识点有哪些呢?以下是小编准备的一些三年级数学知识点及公式,仅供参考。
每份数×份数=总数,
总数÷每份数=份数,
总数÷份数=每份数,
1倍数×倍数=几倍数,
几倍数÷1倍数=倍数,
几倍数÷倍数=1倍数,
速度×时间=路程,
路程÷速度=时间,
路程÷时间=速度,
单价×数量=总价,
总价÷单价=数量,
总价÷数量=单价,
工作效率×工作时间=工作总量,
工作总量÷工作效率=工作时间,
工作总量÷工作时间=工作效率,
因数×因数=积,
积÷一个因数=另一个因数,
被除数÷除数=商,
被除数÷商=除数,
商×除数=被除数,
周长:围成一个封闭图形的所有边长的总和叫做周长,
正方形周长:边长+边长+边长+边长=周长或边长__4=周长,
正方形的特点:四条边相等,四个直角,
长方形周长:长+长+宽+宽=周长 (长+宽)__2=周长,
长方形的特点:对边平行且相等四个直角,
平行四边形的特点:对边平行且相等容易变形没有直角且对角相等。
知识点是知识中的最小单位,最具体的内容,有时候也叫“考点”。那么关于小学四年级数学知识点有哪些呢?以下是小编准备的一些四年级数学知识点及公式,仅供参考。
一、填空
1、学校有足球24个,是篮球的3倍,学校有足球,篮球共( )个
2、甲数是15,乙数比甲数的2倍多3,乙数比甲数多( )
3、甲、乙两数的平均数是14,乙、丙两数的平均数是18,甲、丙两数的平均数是16、甲、乙、丙三数的平均数是( )
二、选择正确答案的字母填在括号里
1、12除24的商乘24与12的差,积是多少?正确列式是 [ ]
A、(24-12)×(24÷12)
B、24÷12×(24-12)
2、生产小组第一天生产玩具24件,第二天生产26件,第三天上午生产18件,下午生产20件、平均每天生产多少件?正确列式是 [ ]
A、(24+26+18+20)÷3
B、(24+26+18+20)÷4
三、列综合算式计算
1、78减去17除102的商,再乘以64,积是多少?
2、23个915除以5的商,比4500少多少?
四、计算下面各题
(2626÷13-112)×45
6970÷(142×3-385)
五、一本书,小华看了45页,没看的比看了的3倍少8页,这本书共有多少页?
六、师徒二人共同加工一批零件,师傅每小时加工125个,徒弟每小时加工100个,8小时完成任务,完成任务时,师傅比徒弟共多加工多少个零件?师傅和徒弟共加工多少个零件?
七、已知甲、乙、丙三个数的平均数是268,丁数为148,求这四个数的'平均数是多少?
八、同学们参加环保活动,六一班42人,平均每人清理环境80平方米,六二班38人,共清理环境2800平方米,两个班平均每人清理环境多少平方米?
参考答案
一、1、32 2、 18 3、16
二、1、A 2、 A
三、1、4608 2、291
四、1、4050 2、170
五、45×3-8+45=172(页)
六、(125-100)×8=200(个)
(125+100)×8=1800(个)
七、(268×3+148)÷4=238
八、(80×42+2800)÷(42+38)= 77(平方米)
对于小学低年级孩子来说,如何学好数学对今后的能力养成十分重要,那么二年级数学知识点有哪些呢?以下是小编准备的一些二年级数学知识点及公式,仅供参考。
(一)被除数、除数、商
被除数÷除数=商,
被除数÷商=除数,
商×除数=被除数,
除数×商+余数=被除数
(二)四则运算定律
加法交换律:a+b=b+a,
加法结合律:(a+b)+c=a+(b+c),
乘法交换律:ab=ba,
乘法结合律:(ab)c=a(bc),
乘法分配律:(a±b)c=ac±bc。
(三)四则混合运算
在四则运算中,加法和减法称为第一级运算,乘法和除法称为第二级运算。
在没有括号的算式里,如果只含有同一级运算,要从左往右一次计算;如果含有两级运算,要先做第二级运算,再做第一级运算。
在有括号的算式里,要先算括号里面的,如果既有小括号又有中括号,要先算小括号里面的,再算中括号里面的,最后算括号外面的。
(四)小学数学减法的基本性质
a-(b+c)=a-b-c
a-b-c=a-(b+c)
数学是人类对事物的抽象结构与模式进行严格描述的一种通用手段,那么小学数学知识点及公式有哪些呢?以下是小编准备的一些小学数学知识点及公式,仅供参考。
时间单位换算
1世纪=100年1年=12月
大月(31天)有:135781012月
小月(30天)的有:46911月
平年2月28天,闰年2月29天
平年全年365天,闰年全年366天
1日=24小时1时=60分
1分=60秒1时=3600秒
重量单位换算
1吨=1000千克
1千克=1000克
1千克=1公斤
人民币单位换算
1元=10角
1角=10分
1元=100分
体(容)积单位换算
1立方米=1000立方分米
1立方分米=1000立方厘米
1立方分米=1升
1立方厘米=1毫升
1立方米=1000升
面积单位换算
1平方千米=100公顷
1公顷=10000平方米
1平方米=100平方分米
1平方分米=100平方厘米
1平方厘米=100平方毫米
长度单位换算
1千米=1000米1米=10分米
1分米=10厘米1米=100厘米
1厘米=10毫米
和差问题的公式
(和+差)2=大数
(和-差)2=小数
和倍问题
和(倍数-1)=小数
小数倍数=大数
(或者和-小数=大数)
利润与折扣问题
利润=售出价-成本
利润率=利润成本100%=(售出价成本-1)100%
涨跌金额=本金涨跌百分比
折扣=实际售价原售价100%(折扣1)
利息=本金利率时间
税后利息=本金利率时间(1-20%)
浓度问题
溶质的重量+溶剂的重量=溶液的重量
溶质的重量溶液的重量100%=浓度
溶液的'重量浓度=溶质的重量
溶质的重量浓度=溶液的重量
流水问题
顺流速度=静水速度+水流速度
逆流速度=静水速度-水流速度
静水速度=(顺流速度+逆流速度)2
水流速度=(顺流速度-逆流速度)2
追及问题
追及距离=速度差追及时间
追及时间=追及距离速度差
速度差=追及距离追及时间
相遇问题
相遇路程=速度和相遇时间
相遇时间=相遇路程速度和
速度和=相遇路程相遇时间
盈亏问题
(盈+亏)两次分配量之差=参加分配的份数
(大盈-小盈)两次分配量之差=参加分配的份数
(大亏-小亏)两次分配量之差=参加分配的份数
植树问题
1.非封闭线路上的植树问题主要可分为以下三种情形:
⑴如果在非封闭线路的两端都要植树,那么:
株数=段数+1=全长株距-1
全长=株距(株数-1)
株距=全长(株数-1)
⑵如果在非封闭线路的一端要植树,另一端不要植树,那么:
株数=段数=全长株距
全长=株距株数
株距=全长株数
⑶如果在非封闭线路的两端都不要植树,那么:
株数=段数-1=全长株距-1
全长=株距(株数+1)
株距=全长(株数+1)
2.封闭线路上的植树问题的数量关系如下
株数=段数=全长株距
全长=株距株数
株距=全长株数
差倍问题
差(倍数-1)=小数
小数倍数=大数
(或小数+差=大数)
小学数学图形计算公式
1.正方形C周长S面积a边长周长=边长4C=4a面积=边长边长S=aa
2.正方体V:体积a:棱长表面积=棱长棱长6S表=aa6体积=棱长棱长棱长V=aaa
3.长方形C周长S面积a边长 周长=(长+宽)2C=2(a+b)面积=长宽S=ab
4.长方体V:体积s:面积a:长b:宽h:高(1)表面积(长宽+长高+宽高)2S=2(ab+ah+bh)(2)体积=长宽高V=abh
5.三角形s面积a底h高面积=底高2s=ah2三角形高=面积2底三角形底=面积2高
6.平行四边形s面积a底h高面积=底高s=ah
7.梯形s面积a上底b下底h高面积=(上底+下底)高2s=(a+b)h2
8.圆形S面积C周长d=直径r=半径 (1)周长=直径=2半径C=d=2r(2)面积=半径半径
9.圆柱体v:体积h:高s;底面积r:底面半径c:底面周长(1)侧面积=底面周长高(2)表面积=侧面积+底面积2(3)体积=底面积高(4)体积=侧面积2半径
10.圆锥体v:体积h:高s;底面积r:底面半径体积=底面积高3总数总份数=平均数
单位换算
(1)1公里=1千米1千米=1000米1米=10分米1分米=10厘米1厘米=10毫米
(2)1平方米=100平方分米1平方分米=100平方厘米1平方厘米=100平方毫米
(3)1立方米=1000立方分米1立方分米=1000立方厘米1立方厘米=1000立方毫米
(4)1吨=1000千克1千克=1000克=1公斤=1市斤
(5)1公顷=10000平方米1亩=666.666平方米
(6)1升=1立方分米=1000毫升1毫升=1立方厘米
小学数学是通过教材,教小朋友们关于数的认识,四则运算等一系列的知识,那么小学数学知识点及公式有哪些呢?以下是小编准备的一些小学数学知识点及公式总结,仅供参考。
一、“相信你的能力!”请你耐心填一填。(本题共20分,每空1分)
1、二十亿零三十万写作(2000300000 ),改写成用“万”作单位的数是( 200030万 ),省略“亿”后面的尾数约是( 20亿 )。
2、一个蛋糕生2千克,把它平均分给10个小朋友,每个小朋友分得这个蛋糕的(0.1),分得的重量是(0.2)千克。
3、向南走200米记作+200米,那么-350米表示(向北350米)。
4、0.006千克=(6)克 2.15小时=(2)小时(9)分
5升9毫升=(5.09)立方分米 980平方分米=(9.8)平方米
5、六(1)班今天出勤48人,有2人因病请假,今天六(1)班学生的出勤率是(46/48)。
6、 5; 20; 0.6 .
7、把一根木料锯成4段要用12分钟,照这样,如果要锯成6段,一共需要(18)分钟。
8、从一个边长为20厘米的正方形纸片中,剪出一个最大的圆,这个圆的面积是(314)平方厘米。
9、从甲城到乙城,货车要行3小时,客车要行4小时,货车与客车的时间最简比是(3:4),货车与客车的速度最简比是(4:3)。
10一个圆柱和一个圆锥的底面积和体积分别相等,圆锥的高是1.8分米,圆柱的高是(0.6)分米。
二、请你判一判。你认为对的,请在每小题的后面括号里打上“√”,错的打上“×”。(本题共8分,每空1分)
1、公历年份是4的倍数的一定都是闰年。 (×)
2、半圆的周长就是它所在圆周长的一半。 (×)
3、一个数的倒数不一定比这个数小。 (√)
4、如果两条直线平行,那么这两条直线一定在同一平面内。 (×)
5、一吨煤用去它的40%,还剩下60%吨。 (×)
6、小数点的后面添上0或者去掉0,小数的大小不变。 (×)
7、一个长方体,它的长、宽、高都扩大2倍,它的体积扩大6倍。 (×)
8、把5个苹果放入3个抽屉里,至少有一个抽屉里的苹果不少于3个。 (×)
三、请你精心选一选。把正确的答案的`序号填在括号里。(本题共5分,每空1分)
1、用一个放大100倍的放大镜来观察一个30度的角,则观察到的角( A )。
A、大小不变 B、缩小了100倍 C、放大了100倍
2、一个三角形的三个内角度数比是2:3:5,这个三角形是( C )。
A、锐角三角形 B、钝角三角形 C、直角三角形
3、 是大于10的自然数,下列分数中分数值最小的是( B )。
A、 B、 C、
4、一种商品,原价600元,现按九折出售,现在的价格比原来便宜( C )。
A、530元 B、40元 C、60元
5、用一条长200厘米的铁丝围成以下图形,面积最大的是( B )。
A、正方形 B、圆 C、长方形
四、坚信你的“运算本领”。请你细心算一算。(本题共32分)
1、直接写出下面各题的得数。(本题共8分,每小题1分)
25.7 9.14 3.5 0.99
5/4 3.6 24/7 1/3
2、计算下面各题(能简算的要简算)。(本题共12分,每小题3分)
解:原式=40×0.25=10 解:原式=(1.8+2.2)×0.25=1
解:原式=[1-1/4]×2/3 解:原式=12×[7/6×3]
=3/4×2/3=0.5 =12×7/2=42
3、解比例或解方程。(本题共6分,每空=小题3分)
解:原方程得10.1-2.9=4x 解:原方程得 24x=12×7.5
4x=7.2 24x=90
X=7.2÷4 x=3.75
X=1.8
4、列综合算式或方程计算。(本题共6分,每空3分)
(1)10与3.5除0.7的商相加,再乘0.2,积是多少?(列综合算式)
解:(10+0.7÷3.5)×0.2=(10+0.2)×0.2=20.4
(2)4.32的 比一个数的60%少6,求这个数是多少?(用方程解)
解:设这个数为x
4.32× =60%x-6
0.45×5=0.6x-6
0.6x=8.25
X=13.75
五、做一做、画一画。(单位:厘米)(共10分)
(1)求下列阴影部分的面积。(3分) (2)求圆锥的体积。(3分)
20cm
解:S阴=20×20-3.14×102
=400-314=86
解:V圆锥= ×3.14× ×15
=62.8
(3)画一画。
1、画出三角形ABC的BC边上的高。(2分)
2、根据右图中提供的信息,不用没量任何数据,画一个与三角形ABC面积相等的三角形。(2分)
六、“发挥你的聪明才智”请你用心解一解。(本题共25分,每小题5分)
1、在比例尺是 的地图上,量得甲、乙两地之间的距离是2.4厘米,求甲、乙两地实际距离是多少千米?
解:设甲、乙两地实际距离为xcm
=2.4:x
X=2.4×3500000=840000cm
X=840km
答:设甲、乙两地实际距离为840km
2、利民果园有梨树180棵,其中苹果树的棵数比梨树多 。果园里有苹果树多少棵?
解:180+180×1/4=225
3、一种手机,现在售价是1200元,比原来降低了400元。降低了百分之几?
解:设降低了百分之x
1200(1-x)=1200-400
X=400/1200=33.3%
4、甲、乙两港相距140千米,一艘轮船从甲港驶往乙港用了4.5小时,返回时因为是逆行,比去时多用了1小时,求这艘轮船往返的平均速度?
解:(140×2)÷(4.5+1+4.5),
=280÷10,
=28(千米/时);
答:这艘轮船往返的平均速度是28千米/时.
5、某车间要生产一批电视机零件900个,由甲组单独做12天完成,由乙组单独做18天完成,先由甲组做7天,剩下的两组合作,还要几天完成?
解:先算出甲每天完成900÷12=75个,乙每天完成900÷18=50个。
然后得出(900-7X75)÷(75+50)=3,所以先由甲单独做7天,剩下的两组合作,还要3天才能完成。
对于很多人来说,高中物理是噩梦一般的存在,那么高考物理必背公式及知识点有哪些呢?以下是小编准备的一些高考物理必背公式整理总结,仅供参考。
一、三种产生电荷的方式:
1、摩擦起电:
(1)正点荷:用绸子摩擦过的玻璃棒所带电荷;
(2)负电荷:用毛皮摩擦过的橡胶棒所带电荷;
(3)实质:电子从一物体转移到另一物体;
2、接触起电:
(1)实质:电荷从一物体移到另一物体;
(2)两个完全相同的物体相互接触后电荷平分;
(3)、电荷的中和:等量的异种电荷相互接触,电荷相合抵消而对外不显电性,这种现象叫电荷的中和;
3、感应起电:把电荷移近不带电的导体,可以使导体带电;
(1)电荷的基本性质:同种电荷相互排斥、异种电荷相互吸引;
(2)实质:使导体的电荷从一部分移到另一部分;
(3)感应起电时,导体离电荷近的一端带异种电荷,远端带同种电荷;
4、电荷的基本性质:能吸引轻小物体;
二、电荷守恒定律:电荷既不能被创生,亦不能被消失,它只能从一个物体转移到另一物体,或者从物体的一部分转移到另一部分;在转移过程中,电荷的总量不变。
三、元电荷:一个电子所带的电荷叫元电荷,用e表示。
1、e=1.6×10-19c;
2、一个质子所带电荷亦等于元电荷;
3、任何带电物体所带电荷都是元电荷的整数倍;
四、库仑定律:真空中两个静止点电荷间的相互作用力,跟它们所带电荷量的乘积成正比,跟它们之间距离的二次方成反比,作用力的方向在它们的连线上。电荷间的这种力叫库仑力,
1、计算公式:F=kQ1Q2/r2(k=9.0×109N.m2/kg2)
2、库仑定律只适用于点电荷(电荷的体积可以忽略不计)
3、库仑力不是万有引力;
五、电场:电场是使点电荷之间产生静电力的一种物质。
1、只要有电荷存在,在电荷周围就一定存在电场;
2、电场的基本性质:电场对放入其中的电荷(静止、运动)有力的作用;这种力叫电场力;3、电场、磁场、重力场都是一种物质
六、电场强度:放入电场中某点的电荷所受电场力F跟它的电荷量Q的比值叫该点的电场强度;
1、定义式:E=F/q;E是电场强度;F是电场力;q是试探电荷;
2、电场强度是矢量,电场中某一点的场强方向就是放在该点的正电荷所受电场力的方向(与负电荷所受电场力的方向相反)
3、该公式适用于一切电场;4、点电荷的电场强度公式:E=kQ/r2
七、电场的叠加:在空间若有几个点电荷同时存在,则空间某点的电场强度,为这几个点电荷在该点的电场强度的矢量和;解题方法:分别作出表示这几个点电荷在该点场强的有向线段,用平行四边形定则求出合场强;
八、电场线:电场线是人们为了形象的描述电场特性而人为假设的线。
1、电场线不是客观存在的线;
2、电场线的形状:电场线起于正电荷终于负电荷;G:用锯木屑观测电场线.DAT
(1)只有一个正电荷:电场线起于正电荷终于无穷远;
(2)只有一个负电荷:起于无穷远,终于负电荷;
(3)既有正电荷又有负电荷:起于正电荷终于负电荷;
3、电场线的作用:
1、表示电场的强弱:电场线密则电场强(电场强度大);电场线疏则电场弱电场强度小);
2、表示电场强度的方向:电场线上某点的切线方向就是该点的场强方向;
4、电场线的特点:
1、电场线不是封闭曲线;2、同一电场中的电场线不向交;
九、匀强电场:电场强度的大小、方向处处相同的电场;匀强电场的电场线平行、且分布均匀;
1、匀强电场的电场线是一簇等间距的平行线;2、平行板电容器间的电是匀强电场;场
十、电势差:电荷在电场中由一点移到另一点时,电场力所作的功WAB与电荷量q的比值叫电势差,又名电压。
1、定义式:UAB=WAB/q;2、电场力作的功与路径无关;
3、电势差又命电压,国际单位是伏特;
十一、电场中某点的电势,等于单位正电荷由该点移到参考点(零势点)时电场力作的功;
1、电势具有相对性,和零势面的选择有关;2、电势是标量,单位是伏特V;
3、电势差和电势间的关系:UAB=φA-φB;4、电势沿电场线的方向降低;
时,电场力要作功,则两点电势差不为零,就不是等势面;
4、相同电荷在同一等势面的任意位置,电势能相同;
原因:电荷从一电移到另一点时,电场力不作功,所以电势能不变;
5、电场线总是由电势高的地方指向电势低的地方;
6、等势面的画法:相另等势面间的距离相等;
十二、电场强度和电势差间的关系:在匀强电场中,沿场强方向的两点间的电势差等于场强与这两点的距离的乘积。
1、数学表达式:U=Ed;
2、该公式的使适用条件是,仅仅适用于匀强电场;
3、d是两等势面间的垂直距离;
十三、电容器:储存电荷(电场能)的装置。
1、结构:由两个彼此绝缘的金属导体组成;
2、最常见的电容器:平行板电容器;
十四、电容:电容器所带电荷量Q与两电容器量极板间电势差U的比值;用“C”来表示。
1、定义式:C=Q/U;
2、电容是表示电容器储存电荷本领强弱的物理量;
3、国际单位:法拉简称:法,用F表示
4、电容器的电容是电容器的属性,与Q、U无关;
十五、平行板电容器的决定式:C=εs/4πkd;(其中d为两极板间的垂直距离,又称板间距;k是静电力常数,k=9.0×109N.m2/c2;ε是电介质的介电常数,空气的介电常数最小;s表示两极板间的正对面积;)
1、电容器的两极板与电源相连时,两板间的电势差不变,等于电源的电压;
2、当电容器未与电路相连通时电容器两板所带电荷量不变;
十六、带电粒子的加速:
1、条件:带电粒子运动方向和场强方向垂直,忽略重力;
2、原理:动能定理:电场力做的功等于动能的变化:W=Uq=1/2mvt2-1/2mv02;
3、推论:当初速度为零时,Uq=1/2mvt2;
4、使带电粒子速度变大的电场又名加速电场;
高考数字是比较难的,那么同学们总结过相应的数学常用公式吗?关于高考数学知识点及公式又有哪些呢?以下是小编准备的一些高考数学知识点总结及公式,仅供参考。
两角和公式
sin(A+B)=sinAcosB+cosAsinB sin(A-B)=sinAcosB-sinBcosA
cos(A+B)=cosAcosB-sinAsinB cos(A-B)=cosAcosB+sinAsinB
tan(A+B)=(tanA+tanB)/(1-tanAtanB) tan(A-B)=(tanA-tanB)/(1+tanAtanB)
ctg(A+B)=(ctgActgB-1)/(ctgB+ctgA) ctg(A-B)=(ctgActgB+1)/(ctgB-ctgA)
倍角公式
tan2A=2tanA/(1-tan2A) ctg2A=(ctg2A-1)/2ctga
cos2a=cos2a-sin2a=2cos2a-1=1-2sin2a
半角公式
sin(A/2)=√((1-cosA)/2) sin(A/2)=-√((1-cosA)/2)
cos(A/2)=√((1+cosA)/2) cos(A/2)=-√((1+cosA)/2)
tan(A/2)=√((1-cosA)/((1+cosA)) tan(A/2)=-√((1-cosA)/((1+cosA))
ctg(A/2)=√((1+cosA)/((1-cosA)) ctg(A/2)=-√((1+cosA)/((1-cosA))
和差化积
2sinAcosB=sin(A+B)+sin(A-B) 2cosAsinB=sin(A+B)-sin(A-B)
2cosAcosB=cos(A+B)-sin(A-B) -2sinAsinB=cos(A+B)-cos(A-B)
sinA+sinB=2sin((A+B)/2)cos((A-B)/2 cosA+cosB=2cos((A+B)/2)sin((A-B)/2)
tanA+tanB=sin(A+B)/cosAcosB tanA-tanB=sin(A-B)/cosAcosB
ctgA+ctgBsin(A+B)/sinAsinB -ctgA+ctgBsin(A+B)/sinAsinB
某些数列前n项和
1+2+3+4+5+6+7+8+9+…+n=n(n+1)/2 1+3+5+7+9+11+13+15+…+(2n-1)=n2
2+4+6+8+10+12+14+…+(2n)=n(n+1) 12+22+32+42+52+62+72+82+…+n2=n(n+1)(2n+1)/6
13+23+33+43+53+63+…n3=n2(n+1)2/4 1__2+2__3+3__4+4__5+5__6+6__7+…+n(n+1)=n(n+1)(n+2)/3
正弦定理 a/sinA=b/sinB=c/sinC=2R 注: 其中 R 表示三角形的外接圆半径
余弦定理 b2=a2+c2-2accosB 注:角B是边a和边c的夹角
高考数学是高中理科中非常重要的学科,想要拿高分必须要多做题、多练习,那么高考数学必考公式及知识点有哪些呢?以下是小编准备的一些高考数学公式及知识点,仅供参考。
高中必背88个数学公式——圆的公式
1、圆体积=4/3(pi)(r^3)
2、面积=(pi)(r^2)
3、周长=2(pi)r
4、圆的标准方程(x-a)2+(y-b)2=r2【(a,b)是圆心坐标】
5、圆的一般方程x2+y2+dx+ey+f=0【d2+e2-4f>0】
高中必背88个数学公式——椭圆公式
1、椭圆周长公式:l=2πb+4(a-b)
2、椭圆周长定理:椭圆的周长等于该椭圆短半轴,长为半径的圆周长(2πb)加上四倍的该椭圆长半轴长(a)与短半轴长(b)的差.
3、椭圆面积公式:s=πab
4、椭圆面积定理:椭圆的面积等于圆周率(π)乘该椭圆长半轴长(a)与短半轴长(b)的乘积。
以上椭圆周长、面积公式中虽然没有出现椭圆周率t,但这两个公式都是通过椭圆周率t推导演变而来。
高中必背88个数学公式——两角和公式
1、sin(a+b)=sinacosb+cosasinbsin(a-b)=sinacosb-sinbcosa
2、cos(a+b)=cosacosb-sinasinbcos(a-b)=cosacosb+sinasinb
3、tan(a+b)=(tana+tanb)/(1-tanatanb)tan(a-b)=(tana-tanb)/(1+tanatanb)
4、ctg(a+b)=(ctgactgb-1)/(ctgb+ctga)ctg(a-b)=(ctgactgb+1)/(ctgb-ctga)
高中必背88个数学公式——倍角公式
1、tan2a=2tana/(1-tan2a)ctg2a=(ctg2a-1)/2ctga
2、cos2a=cos2a-sin2a=2cos2a-1=1-2sin2a
高中必背88个数学公式——半角公式
1、sin(a/2)=√((1-cosa)/2)sin(a/2)=-√((1-cosa)/2)
2、cos(a/2)=√((1+cosa)/2)cos(a/2)=-√((1+cosa)/2)
3、tan(a/2)=√((1-cosa)/((1+cosa))tan(a/2)=-√((1-cosa)/((1+cosa))
4、ctg(a/2)=√((1+cosa)/((1-cosa))ctg(a/2)=-√((1+cosa)/((1-cosa))
高中必背88个数学公式——和差化积
1、2sinacosb=sin(a+b)+sin(a-b)2cosasinb=sin(a+b)-sin(a-b)
2、2cosacosb=cos(a+b)-sin(a-b)-2sinasinb=cos(a+b)-cos(a-b)
3、sina+sinb=2sin((a+b)/2)cos((a-b)/2cosa+cosb=2cos((a+b)/2)sin((a-b)/2)
4、tana+tanb=sin(a+b)/cosacosbtana-tanb=sin(a-b)/cosacosb
5、ctga+ctgbsin(a+b)/sinasinb-ctga+ctgbsin(a+b)/sinasinb
高中必背88个数学公式——等差数列
1、等差数列的通项公式为:
an=a1+(n-1)d (1)
2、前n项和公式为:
Sn=na1+n(n-1)d/2或Sn=n(a1+an)/2(2)
从(1)式可以看出,an是n的一次数函(d≠0)或常数函数(d=0),(n,an)排在一条直线上,由(2)式知,Sn是n的二次函数(d≠0)或一次函数(d=0,a1≠0),且常数项为0.
在等差数列中,等差中项:一般设为Ar,Am+An=2Ar,所以Ar为Am,An的等差中项.
,
且任意两项am,an的关系为:
an=am+(n-m)d
它可以看作等差数列广义的通项公式.
3、从等差数列的定义、通项公式,前n项和公式还可推出:
a1+an=a2+an-1=a3+an-2=…=ak+an-k+1,k∈{1,2,…,n}
若m,n,p,q∈N__,且m+n=p+q,则有
am+an=ap+aq
Sm-1=(2n-1)an,S2n+1=(2n+1)an+1
Sk,S2k-Sk,S3k-S2k,…,Snk-S(n-1)k…或等差数列,等等.
和=(首项+末项)__项数÷2
项数=(末项-首项)÷公差+1
首项=2和÷项数-末项
末项=2和÷项数-首项
项数=(末项-首项)/公差+1
高中必背88个数学公式——等比数列
1、等比数列的通项公式是:An=A1__q^(n-1)
2、前n项和公式是:Sn=[A1(1-q^n)]/(1-q)
且任意两项am,an的关系为an=am·q^(n-m)
3、从等比数列的定义、通项公式、前n项和公式可以推出:a1·an=a2·an-1=a3·an-2=…=ak·an-k+1,k∈{1,2,…,n}
4、若m,n,p,q∈N__,则有:ap·aq=am·an,
等比中项:aq·ap=2ar ar则为ap,aq等比中项.
记πn=a1·a2…an,则有π2n-1=(an)2n-1,π2n+1=(an+1)2n+1
另外,一个各项均为正数的等比数列各项取同底数数后构成一个等差数列;反之,以任一个正数C为底,用一个等差数列的各项做指数构造幂Can,则是等比数列.在这个意义下,我们说:一个正项等比数列与等差数列是“同构”的.
性质:①若 m、n、p、q∈N,且m+n=p+q,则am·an=ap__aq;
②在等比数列中,依次每 k项之和仍成等比数列.
“G是a、b的等比中项”“G^2=ab(G≠0)”.
在等比数列中,首项A1与公比q都不为零.
高中必背88个数学公式——抛物线
1、抛物线:y=ax__+bx+c就是y等于ax的平方加上bx再加上c。
a>0时,抛物线开口向上;a<0时抛物线开口向下;c=0时抛物线经过原点;b=0时抛物线对称轴为y轴。
2、顶点式y=a(x+h)__+k就是y等于a乘以(x+h)的平方+k,-h是顶点坐标的x,k是顶点坐标的y,一般用于求最大值与最小值。
3、抛物线标准方程:y^2=2px它表示抛物线的焦点在x的正半轴上,焦点坐标为(p/2,0)。
4、准线方程为x=-p/2由于抛物线的焦点可在任意半轴,故共有标准方程:y^2=2pxy^2=-2p__^2=2pyx^2=-2py。
相信很多的高考生会关心高考生物必考的知识点,那么高考生物知识点及公式有哪些呢?以下是小编准备的一些高考生物知识点及公式大全,仅供参考。
(1)努力搜寻教材相关知识。
根据题目考查的知识点,努力搜寻教材相关内容是解题的关键。答题一定要有依据,很多信息题背景虽新,但考查的知识点却落脚于教材,所以,一定要用好题目中的一些关键词,努力转化成教材中学过的知识而进行破题。
(2)认真分析选择题干和选项的逻辑关系。
生物之所以是理科,是因为它具备严密的逻辑推理性。因此,答题时一定要认真思考推理,进而得出正确答案。
(3)掌握一些常用的答题小技巧。
近几年高考生物选择题中,涉及“正确的是”、“不正确的是”、“错误的是”的试题约占一半。所以,我们一定要好好利用好“错误原理”,这类题目才能迎刃而解。
英语学科对于学生来说是比较难的一个科目,那么九年级上册英语第八单元知识点有哪些呢?以下是小编准备的一些人教版九年级上册英语第八单元知识点,仅供参考。
笔试部分(共95分)
I. 单项填空(每小题1分,共15分)
( )26.----Where is Beth ? ----She to her hometown .
A. has gone B. has been C. went D. have gone
( )27. –Could you tell me Fairmont ? ---The day after tomorrow . I think.
A. when will you visit B. when you will visit C. when would you visit D. when you would visit
( )28.—He to school by bike but now he to school on foot .
A. used to going ; get used to go B. used to go ; gets used to going
C. used to go ; gets used to go D. gets used to going ; gets used to go
( )29. –Zhou Jielun is so cool . I’m his fan. ---
A. So do I B. So I do C. So am ID. So I am
( )30.Whith the help of the government, many poor Children can get chances to school.
A. go B. to go C. goes D. going
( )31.Japan is a country while china is a country.
A. developing ; developed B. developing ; developing C. developed; developing D. developed ; developed
( )32.In china about of people live in the country.
A. three fifth B. third fifth C. third fifths D. three fifths
( )33. Maria has never been to Shanghai. ?
A. isn’t she B. hasn’t she C. has she D. is she
( )34.---Why do you come here? ---We are here to the public services.
A. provide ; to B. provide ; with C. provide ; for D. provide ; in
( )35.HuMing for about two yeas.
A. has joined the army B. has been a soldier C. was a soldier D. joined the aumy
( )36. I have the Great wall twice . It is an place.
A. been to ; excited B. gone to ; exciting C. been to ; exciting D. gone to ; excited
( )37.My English is very poor. I can’t learn it well you help me .
A. if B. unless C. while D. when
( )38.Lily told John for class again next time ,
A. not late B. don’t he late C. didn’t late D. not to be late
( )39. ----What did Ann ask you just now , Tom? --- She asked for the bike.
A. did I pay how much B. I paid how much C. how much did I pay D. how much I paid
( )40.----Do you think the rain will stop tomorrow? ---- It has rained for ten days . It’s too wet every where.
A.I hope not B. I’m sure it is C. I’m afraid to will D. I hope so .
II、完形填空(每小题1分,共15分)
阅读短文,掌握其大意。然后从各小题所给的A、B、C、D四个选项中选出可以填入相应空白处的.最佳答案,并将其标号填入题前的括号内。
Pan Weihong, 14, from Taizhou, Zhejiang, was watching news on her computer when her mother came in. Her mother immediately asked her to turn off the computer, but Pan 41 .
“I was taking a rest. I wasn’t going to use it for 42 ,” said Pan. “But she didn’t listen. I couldn’t understand her!”
Many teenagers often feel the 43 as Pan. Growing up, they might feel as if their parents want to 44 them.
The main reason behind this all is that teenagers are becoming more independent (独立的) and want to make their own decisions, 45 parents have their worries too.
Pan’s mother thought Pan was “too young to use the computer 46 ”.
Besides, 47 children and parents have stresses in their own lives. Children have to study hard. Their parents need to 48 the whole family. Without a proper way to ease (减轻) the stress, it’s 49 to bring it home with you.
To solve the problem, children 50 walk in their parents’ shoes, said Xia Ziting, 15, from Nanjing, Jiangsu.
“ 51 our parents do is the life experience that we don’t have now. More often than not, they are right,” she said. “They may just use the wrong way of telling us.”
Wang Jiannan, 15, from Taiyuan, Shanxi, 52 that teenagers find the right time and right way to talk to their parents.
“Don’t argue with them when they’re very angry. It’s taken me many painful (痛苦的)
53 _ to learn that,” he laughed. Wang 54 talking to parents in an easy tone when doing housework together, during a walk, or, as he usually does, at dinnertime.
“After all, no one wants to argue on a (an) 55 stomach !” he said.
41. A. agreed B. refused C. received D. forgot
42. A. short B. ever C. long D. years
43. A. same B. different C. serious D. unfair
44. A. understand B. love C. support D. control
45. A. but B. and C. or D. so
46. A. incorrectly B. properly C. happily D. excitedly
47. A. neither B. either C. both D. all
48. A. lose B. encourage C. support D. reply
49. A. difficult B. good C. exciting D. easy
50. A. could B. should C. would D. might
51. A. What B. Which C. That D. Whether
52. A. taught B. warned C. advised D. used
53. A. subjects B. lessons C. suggestions D. diseases
54 A. said B. continued C. imagined D. suggested
55. A. empty B. full C. big D. angry
III. 阅读理解(每小题2分,共40分)
阅读A、B、C、D、四篇材料,然后从各个小题所给的四个选项中选出最佳选项。
A
Bayfield shopping Coupons(购物券)
6 Hours Free (免费) Parking
If you spend $100 or more in our stores you will receive six hours of free parking. Take this coupon to the service desk on level 4 to stamp! Buy one, get one free
Buy one shirt or tie at Daniel's Menswear, and get another shirt or tie of the same value free.
10% Off
Show this coupon at the Book Store to get a 10% discount (折扣) on any books you buy. We have lots of books to choose, including children’s books, novels, travel guides and hobbies. You're sure to find something that you will enjoy. Free soft drink
Buy any meal for at least $6 at Mike's Cafe, and receive a free soft drink. We serve the best hamburgers and snacks in the Mall. Come in and try our delicious meals and our excellent service. You won’t be disappointed!
Half- price movie tickets
Buy any full-price movie ticket on Tuesdays or Wednesdays, and you can buy a second ticket for a friend for only half price. The latest movies are all here.
56. If you spend 100 dollars or more, you can ____________.
A. get a CD free B. get 6 hours of free parking
C. get some stamps free D. get a car free
57. Buy one tie at Daniel's Menswear, you may get another _______free.
A. cheaper tie B. more expensive tie
C. tie of the same price D. tie of different price
58. You can get a 10% discount on any books if you _______ at the Book Store.
A. buy some gifts B. buy some tickets
C. show this coupon D. buy some books
59. If you want to have free soft drink, you can go to____________.
A. Mike's Cafe B. the Book Store
C. Daniel’s Menswear D. the Movie House
60. If John pays 10 dollars for a full-price movie ticket on Tuesdays, he can buy a second ticket for only ____________.
A. 5 dollars B.10 dollars C. 15 dollars D. 20 dollars
学习要养成归纳的习惯,这也是学习任何知识的重要方法,那么九年级上册英语第九单元知识点怎么学习呢?以下是小编准备的一些九年级上册英语第九单元知识点,仅供参考。
记单词有窍门
单词是英语学习的基础,它是垒起英语这座长城的坚硬的.基石。初三复习阶段,单词的记忆是非常重要的。下面,笔者为大家介绍一些巧记单词的方法。
选择最佳记忆时间
每一个同学都有不同的记忆习惯和最佳记忆时间,通过实践摸索,同学们可以选择自己记忆效果最佳的时间。如每天清晨或每晚临睡以前,坚持每天背单词的习惯。
运用单词本身的规律
记单词时,我们应该结合单词的构词法、词性转换或同义词、反义词的归纳来巧记单词。如:care(n./V.)-careful(adj.)-careless(adj.)-carefully(adv.)-carelessly(adv.)-carefulness(n.)-care鄄lessness(n.)
利用多种感官记忆
同学们在背单词时,常常是读读写写,边读边背。事实上,利用听觉来加强记忆也能起到很好的效果。如把单词的读音、拼写和汉语词义录在录音机里,在临睡前或上下学的路上反复听,它能刺激我们的无意注意,强化记忆,轻轻松松就记住了单词。
通过归类记忆
在记忆单词时,同学们还可以有目的地进行单词整理,如把单词归类,写在小卡片上,利用平时空闲的时间进行专项的单词记忆。如体育项目类:
high-jump(跳高),long-jump(跳远),discus-throwing(掷铁饼),relay-race(接力跑),110-meterhurdles(110米跨栏),diving(跳水),fencing(击剑),boxing(拳击),tabletennis(乒乓球),tennis(网球),badminton(羽毛球),volleyball(排球),football(足球),basketball(篮球),gymnastics
(体操)等。
遵循记忆规律
在背单词的过程中,很多同学都有这样的经历,明明自己背过的单词不久以后却又忘了。这就需要我们遵循记忆规律,经常循环地复习。通常,以每两周进行一次单词总复习为宜。
同学们在日常学习中一定要养成一个及时整理知识点的习惯,那么关于九年级上册英语第五单元知识点有哪些呢?以下是小编准备的一些九年级上册英语第五单元知识点,仅供参考。
一、单项选择 (共10小题,每小题2分,计20分)
( )1. You should play with your pet for _________every day.
A. sometime B. sometimes C. some time D. some times
( )2. I saw many clothes _________ of silk and cotton on display.
A. made B. are made C. made out D. making
( )3. ---_________,Peter. That step is not safe.
--- Thanks.
A. Look up B. Look out C. Look on D. Look round
( )4. ----Oh, so many new flats! I can’t believe that. It used to be a poor village.
----Yes._______ has changed here!
A. Nothing B. Something C. Everything D. Anything
( )5. ---Excuse me. Can you tell me______________?
----Sure. There ‘s a good restaurant on Main Street.
A. Where I can post letters B. What movie I can see here
C. How I can get to the bus station D. if there ‘s a good place to eat in
( )6. There are many tall buildings on _________ side of the street.
A. either B. all C. both D. nor
( )7. Our family has bought a car so we can travel __________ than before.
A. most easily B. easier C. much easier D. more easily
( )8. ---When did the fireman leave?
---They didn’t leave until they _______ the fire.
A. put up B. put out C. put away D. put on
( )9. Mother asked me to keep the windows _________ and ________ the door.
A. open, closed B. open, close C. opened, closed D. opened, close
( )10. James with the Greens _________ Yan Du Park if it ___________ tomorrow.
A. is going to, isn’t rain B. are going to, doesn’t rain
C. is going to, wont’ rain D. is going to, doesn’t rain
二、完形填空 (共15小题,每小题1分,计15分)
In some science fiction movies, the robots are just like humans. They help with the housework and do the most 1 jobs.
Some scientists believe that there will be such robots in the future. 2 , they agree it may
3 hundreds of years. Scientists are now trying to make robots 4 people and do the same things as us.
But robot scientist James White 5 . He thinks that it will be 6 for a robot to do the same things as a person. 7 , it's easy for a child to wake up and know where they are. Mr. White thinks that robots won't be able to do this. But other scientists disagree. They think that robots will be able to talk to people 8 25 to 50 years.
Robot scientists are not just trying to make robots look like people. For example, there are already robots 9 in factories. They do simple jobs over and over again. People would not like to do such jobs and would get bored. But robots will 10 get bored.
In the future, there will be more robots everywhere, and humans will have 11 work to do. New robots will have many different 12 . Some will look like humans, and 13 might look like snakes. After an earthquake (地震), a snake robot could help look for people under buildings. That may not seem possible now, but computers, space rockets and even electric toothbrushes 14 impossible a hundred years ago. We never know 15 will happen in the future!
( )1. A. interesting B. unpleasant C. pleasant D. popular
( )2. A. But B. So C. However D. While
( )3. A. use B. spend C. pay D. take
( )4. A. look like B. look at C. look for D. look up
( )5. A. agrees B. disagrees C. likes D. dislikes
( )6. A. easy B. difficult C. important D. possible
( )7. A. For example B. Instead C. Such as D. Besides
( )8. A. after B. for C. over D. in
( )9. A. worked B. work C. working D. to work
( )10. A. always B. easily C. never D. often
( )11. A. more B. less C. fewer D. little
( )12. A. shapes B. colors C. sizes D. actions
( )13. A. the other B. other C. the others D. others
( )14. A. seem B. seemed C. got D. look
( )15. A. that B. how C. what D. when
三、阅读理解(共5小题,每小题2分,计10分)
Every 30 seconds there is an earthquake. But don't worry because most are so weak that they cannot be. felt. Only a few big ones hurt people.
Many earthquakes happened in China, such as the big one in Sichuan last month. Thousands of people died in it. So it's important to know what to do when one hits. Here are some tips on how to stay safe in an earthquake.
1. If you are indoors during an earthquake, hide (躲藏) under a desk. Stay away from windows and anything that could fall on you.
2. If you are outdoors, move to a clear place. Try to be away from trees, signs, buildings and streetlights. These could fall on you.
3. If you are in a shop and far from the door, don't try to run outside and rush for exits (出口). Everyone will be doing that and you'11 find it hard getting out. Don't get into a lift during an earthquake. Just hide under some strong cover near you.
4. When an earthquake has ended, be careful because aftershocks may still happen. These are just as dangerous as the earthquake itself. So stay under the desk until you make sure it's safe to get up.
5. If you are at home and you smell gas (煤气) , open the windows and get out of the building as quickly as you can. A gas line in your house may be broken. This could be very dangerous.
( )1. Most earthquakes are too_________ to hurt people.
A. strong B. weak C. dangerous
( )2.If you are outdoors, it would be safe to _________.
A. go to a playground B. stay under a tree C. stand by the window
( )3. If you're in a shop and far from the door, you'd better_________.
A. rush to the door fight away
B. run after the people quickly
C. hide yourself under a cover near you
( )4. The best title of this passage is "_________".
A. How dangerous the earthquake is
B. How to be safe during an earthquake
C. Don't be afraid of the earthquake
( )5. Which of the following statements is TRUE according to the passage?
A. Most earthquakes are very dangerous, so we must be very careful every day.
B. You'd better keep away from those things that may fall on you wherever you are.
C. If you smell gas at home, try to hide under a desk and don't run outside quickly.
四、词汇
Ⅰ. 根据所给中文提示及首字母写出所缺单词。(共15小题,每小题2分,计30分)
1. He is listening to John_________(静静地) in the next room.
2. The breeze(微风) sounds like a w__________(soft noise).
3. Look! There are dark clouds in the sky. It’s l__________(possible) to rain soon.
4. “Your answer isn’t c___________ at all,” the father said to his son angrily.
5. His parents are working in the factory and he is now at home a__________(only one).
6. A person without a dream is just like a bird without __________(翅膀).
7. Don’t ___________(吓唬) the little girl, or she will cry.
8. I know where he lives, so I don’t have any t_________(problem)in finding his house.
9. How many _________(刷子) are there in the bag?
10. My dog likes to c__________ and catch balls.
11. That supermarket is full of ____________(顾客) every day. What’s the secret?
12. The man is very strange. I found it d________ to get along well with him..
13. What fine weather! The sun is shining brightly ____________(穿过) the window into the room.
14. I was late for class this morning because there was too much ___________(车辆) in the street.
15. Yan cheng is f_________(well or widely known) for the long history.
Ⅱ. 用方框中所给词的适当形式填空,每词限用一次。(共10小题,每小题1分,计10分)
Dear Sir:
I would like to make a comment on the plastic bags which we use in our daily life.
I thought that 1 effect from all these bags on our environment was well-known and that most people know they should not keep 2 them but collect them in the dustbin. However, one of the 3 near my home seems to use 4 of these bags than ever before. Red ones, white ones and blue plastic ones---it 5 no difference. They don’t 6 about the problems of environment.
They still use plastic bags to wrap most of the things every day. When I went shopping the other day, I bought two things, and I 7 three bags to wrap __8____.Is it necessary 9 so many bags? Everyone should realize 10 important it is to clean our environment.
Yours sincerely,
Tony Wang
1. ____________2. ____________3. ____________4.____________5. ____________
6. ____________7. ____________8. ____________9.____________10. ___________
五、根据所给提示将下列各句译成英语 (共5 小题,每小题 3分, 计15分)
1. 跟往常一样,我们没看到什么异常。
_________________, we didn’t see ____________________.
2.张华用毯子扑灭大火。
Zhang Hua ________ _________ the fire _________the blanket.
3.我们想推荐汤姆获得今年青年奖。
We want to _________ Tom ______ this year’s Youth ________.
4. 他的叔叔整天忙于生意。
His uncle _______ ________ __________ his business all day.
5. 到最近的.景点打的需要十二分钟。
It __________ twenty minutes ____________ the nearest tourist attraction _______________.
做好课前预习,有助于同学们在新课程的学习中更快更好的掌握新知识。那么关于九年级上册英语第七单元知识点怎么学习呢?以下是小编准备的一些九年级上册英语第七单元知识点,仅供参考。
一、单选:1. D 2. D 3. B 4. B 5. A 6. D 7. D 8. A 9. A 10. B11. D 12. A 13. D 14. B 15. C
二、完形填空
1. C 2. B 3. A 4. D 5. C 6. B 7. B 8. D 9. C 10. A
三、阅读: BDBCA DBADC
四、任务型阅读。1. education 2. to learn a skill 3. history
4. to show his students how to learn 5. knows how to teach himself/herself
五、根据首字母和句意写出单词:1. provide 2. represent 3. veterinarian 4. thrilling 5. searching
综合填空1. stand 2. next 3. started 4. before 5. tried
6. with 7. move 8. other 9. pleased 10. write
六、写作。Visiting the Great Wall
There are many places of interest in Beijing. And my favorite one is the
Great Wall.
The Great Wall is considered as one of the seven wonders of the world. It’s about six or seven metres high and four or five metres wide. It has a long history of 2,500 years. It was built by the Ancient Chinese working people.
When we stood on it, we saw around. There are mountains around it. It looked like a huge dragon, magnificent and grand. It’s so famous that many people coming from every parts of the world visit it. The Great Wall is the pride of our nation.
只要你能坚持天天学习,九年级英语上册的重点知识一定能学好,那么关于九年级上册英语第六单元知识点怎么学习呢?以下是小编准备的一些九年级上册英语第六单元知识点,仅供参考。
一. 1-5 BCABD 6-10DBCAA 11-15 DACBB
二. 1-5 DACDD 6-10 BACAB
三. 1-5 DGAFB
四. 1-5 BCDAD 6-10 AACCD
11. Kids 30 years ago could run faster and longer than kids today. / Today’s kids are 12 percent less healthy than kids from years ago.
13. By comparing. 63. Two.
14. At least 60 minutes of exercise.
15. Some advice for today’s kids. / What kids should do.
五. 1. daily 2. listed 3. Canadians 4. suddenly 5. customers
六. 1 without doubt 2. taken place 3. by accident 4. translating; into 5. fell into
七. 1. seems 2 like 3. Scientists 4. important 5. looks
6. attention 7. comparing 8. dropped 9. spent 10. Although
八. One possible version:
Hello, everyone! There are many inventions that have changed the world. Here’s a short introduction of some useful inventions.
The telephone was invented by Alexander Bell in 1876. Using a telephone, people can talk to each other no matter how far they’re from each other. The car was invented by Carl Benz in 1885. The car takes people from one place to another quickly so as to help people save time. The TV was invented by John Baird in around 1927. It helps people to know what is happening all over the world. People can not only learn a lot but also relax through watching it.
That’s all. Thanks!
要把学九年级上册英语知识当作一个体力活,要尽可能多地去接触英语材料,那么九年级上册英语第三单元知识点有哪些呢?以下是小编准备的一些九年级上册英语第三单元知识点,仅供参考。
一. 单项选择(每小题1分,共15分)
从A、B、C、D四个选项中选择可以填入空白处的最佳答案。
( )1. There’s ______ mall near my house. ______ mall sells the best clothes.
A. a; A B. the; The
C. the; A D. a; The
( )2. Go straight until you see a museum ______ your left.
A. with B. at
C. on D. from
( )3. The building has ______ floors and our classroom is on the ______ floor.
A. four; four B. fourth; fourth
C. fourth; four D. four; fourth
( )4. You can ask the policeman for help ______ you don’t know the way.
A. though B. if
C. unless D. until
( )5. Jack’s mother taught me how ______ Yunnan rice noodles last weekend.
A. to make B. making
C. make D. to making
( )6. It’s ______ for my son to go to school from here. It only takes five minutes on foot.3原创作品
A. interesting B. dangerous
C. convenient D. difficult
( )7. I asked Julie to go to the movies with me, but she refused me ______.
A. normally B. cheaply
C. politely D. easily
( )8. I think you must be excited ______ your grandfather and uncle.
A. seeing B. see
C. to seeing D. to see
( )9. Linda thinks ______ conversations with friends in English is really helpful.
A. having B. has
C. to having D. have
( )10. He ______ two books. Which should we buy?
A. lost B. suggested
C. returned D. borrowed
( )11. —______ do you wish to speak to at the party?
—Mrs. Green.
A. When B. What
C. Why D. Whom
( )12. Peter wonders if there’s a good place ______ in the city.
A. to have fun B. having fun
C. have fun D. to having fun
( )13. I want to go to Mrs. Li’s home. Could you tell me her ______?
A. address B. name
C. story D. hobby
( )14. —Excuse me, do you know ______?
—Yes, there is a flower shop on Jiefang Road.
A. how can I buy some flowers
B. where I can buy some flowers
C. how I can buy some flowers
D. where can I buy some flowers
( )15. —Sorry to trouble you, but could you please help me carry this heavy box?
—______. Where do you want to put it?
A. Sorry, I can’t B. I hope not
C. Of course D. Good idea
二. 完形填空(每小题1分,共10分)
先通读下面短文,掌握其大意,然后从A、B、C、D四个选项中选择可以填入空白处的最佳答案。
Mr. White is a blind man who likes traveling alone. However, as a blind man, he has met a lot of 1 during his trips.02
Once Mr. White traveled to Texas. It was his first time to go there. On the plane, he sat next to a woman who 2 Texas. The woman told him that everything was 3 and better in her city. When Mr. White arrived, he found a 4 and decided to spend the night there. 【1:3】
After dinner, Mr. White went to a wine bar (酒吧) and ordered a glass of wine. When the waiter (服务员) brought him one, he was 5 . “Wow! How big!” he said. Mr. White doesn’t drink often, 6 he was a little drunk (喝醉) after drinking the wine. He wanted to go to the restroom, so he asked another waiter for 7 . “Turn right at the information desk and it is the second door on the right,” said the waiter.
When Mr. White walked past the first door, he fell down. He missed (错过) the 8 and went towards the third door instead. He walked forward and then 9 into the swimming pool. At that time he 10 that everything there was bigger. “Don’t flush (冲洗)! Don’t flush!” he shouted as soon as he got his head above water.
( )1. A. animals B. troubles
C. strangers D. visitors
( )2. A. came from B. heard from
C. looked at D. arrived at
( )3. A. smaller B. newer 【0:4】
C. older D. bigger
( )4. A. museum B. restaurant
C. hotel D. supermarket
( )5. A. nervous B. surprised
C. upset D. bored
( )6. A. although B. until
C. or D. so
( )7. A. addresses B. directions
C. orders D. suggestions
( )8. A. second B. third
C. fourth D. fifth
( )9. A. got B. turned
C. fell D. jumped
( )10. A. remembered B. dreamed
C. discovered D. hoped
三. 情景交际(每小题1分,共5分)
根据对话内容,从方框中选择恰当的选项补全对话,其中有两项多余。
A: Excuse me, I’m new here. I wonder if you can help me.
B: I’d love to.
A: Thanks. (1)______
B: Yes, there are two. One is on New Street, and the other is on Green Street.
A: (2)______
B: I think the one on New Street is better. It has the newest books.
A: (3)______
B: You can take a bus and it only takes ten minutes.6
A: Thank you. And could you tell me if there is an Italian restaurant around here?
B: Sure. (4)______ The food there is delicious, but it is always crowded. You should go a little earlier to get a table.
A: I see. But could you tell me how I can get there?
B: (5)______ It’s across from the post office.
A: Thanks a lot.
B: You’re welcome.
A. How can I get there?
B. Walk straight for about five minutes, and you will see it.
C. Could you tell me what kind of books the bookstore sells?
D. Could you tell me if there are any bookstores in this town?
E. I often read there.
F. There’s one just on this street.
G. Which is better?
四. 阅读理解(每小题2分,共30分)
A
It’s hard to imagine that just 25 years ago, Berlin was a city split (分开) into two by the Berlin Wall. I’ll never forget how people were excited as the Berlin Wall came down in 19__. Since then, Berlin has become one of the coolest cities in Europe. Here are the main reasons why I think Berlin is cool.
It’s affordable. Berlin has cheap hotels and everyday objects. You don’t have to worry about spending too much money when visiting Berlin.
It has fantastic festivals. Berlin knows how to give parties, and there is a festival here every month of the year. Perhaps the most famous is the Berlin International Film Festival.
It has great architecture (建筑设计). Berlin has beautiful architecture of its own. The Brandenburg Gate, built in the 18th century, is one of the city’s most famous buildings, symbolizing more than 200 years of history. The TV Tower is as good as the Eiffel Tower in Paris and the London Eye.
The art scene is flourishing (繁荣). Berlin is a city of living art. Artists are allowed to create works of art on the sides of buildings.
If you want to visit an affordable European city with culture and lots of colors, Berlin is the place to be. What are you waiting for? Get to Europe’s coolest city before everyone else discovers it.
根据材料内容选择最佳答案。
( )1. How did people feel when the Berlin Wall came down?
A. Surprised. B. Excited.
C. Upset. D. Crazy.
( )2. The underlined word “affordable” in Paragraph 2 means “_____” in Chinese.
A. 可利用的 B. 可触及的
C. 付得起的 D. 用得住的
( )3. How often is there a festival in Berlin?
A. Once a week. B. Twice a week.
C. Once a month. D. Twice a month.
( )4. What’s the TV Tower famous for according to the passage?
A. Its color. B. Its history.
C. Its location. D. Its architecture.
( )5. What does the writer think of Berlin?
A. He can’t stand it. B. He thinks it’s boring.
C. He doesn’t mind it. D. He thinks it’s cool.
B
Without a man, there would be no “happiest place on earth”, also known as Disneyland. That man was Walt Disney.
Disney was born in 1901 in Chicago, Illinois. As a child, he enjoyed drawing and even sold his pictures to his neighbors. In 1918, Disney joined the Red Cross and drove an ambulance (救护车) in France during World War I (第一次世界大战). After the war ended, Disney started making short cartoons in Kansas City, but soon he used up all his money. He decided to get a job in Hollywood. He went to California with only $20 with him.
It took a while, but Disney began to enjoy success with his cartoons. He created Mickey Mouse, the most famous cartoon character ever. Then in 1937, Snow White and the Seven Dwarfs came out and it was a huge success. During the following years, Disney made many more movies that we still watch today, including Pinocchio, Dumbo, and Bambi.
In the 1940s, Disney had an idea of building a fun park for families and the idea grew bigger and bigger ... Years after Disney first had the idea, the first Disneyland opened in 1955 in Anaheim, California. At that time, the ticket cost a dollar. By 1965, 50 million visitors had visited Disneyland.
Disney died in 1966, 5 years before the opening of his next dream park, Disney World in Lake Buena Vista, Florida.
If you ever visit one of the Disney parks, or go to a Disney movie, think of the man who started it all.
根据材料内容选择最佳答案。
( )6. In 1918, Walt Disney ______.
A. moved to California
B. joined the Red Cross
C. made his first short cartoon
D. sold his pictures to his neighbors
( )7. Which of the following Disney movies is NOT mentioned in the passage?
A. Pollyanna. B. Dumbo.
C. Bambi. D. Pinocchio.
( )8. Disney World in Lake Buena Vista, Florida opened in ______.
A. 1940 B. 1965
C. 1966 D. 1971
( )9. Which of the following is TRUE according to the passage?
A. A ticket to Disneyland cost $10 in 1955.
B. Walt Disney showed interest in drawing when he was young.04
C. Snow White and the Seven Dwarfs was not very popular at first.
D. Walt Disney began to enjoy success soon after he went to Hollywood.
( )10. Which is the best title of the passage?
A. Disneyland
B. Disney World
C. The story of Walt Disney
D. Famous Disney cartoon characters
C
Who wants to spend 24 Hours in the Desert? It’s the name of an unusual book. At the beginning, this book describes what a desert is, and then it explains the different kinds of deserts. This book mainly talks about the Sahara Desert, because it is the world’s largest desert. It has an area of about 3.5 million square miles in northern Africa!
Morning life in a desert is described next. In this part, wind, sand, water, and plants relative (有关的) to the desert are discussed. Afternoon life, evening life, and nightlife in a desert are also described. Did you know that the Sahara Desert holds the record for the highest air temperature? Did you also know that sand from the Sahara Desert can ride the winds all the way across the Atlantic Ocean and reach a beach in Florida, USA?
Near the end of the book, one page gives some facts about the Sahara Desert. In the rest of the book, you can find a glossary (术语汇编), a “find out more” part and an index (索引). The “find out more” part gives some books and websites to find out more information about the Sahara Desert.
This book is full of interesting pieces of information. It would be perfect for middle school students.
根据材料内容简要回答下列问题。
11. What does the book 24 Hours in the Desert describe first?
___________________________________________
12. Why does the book mainly talk about the Sahara Desert? 04
___________________________________________
13. Does the book talk about plants relative to the desert?21032
___________________________________________
14. What is the “find out more” part about?
___________________________________________
15. Who would the book be perfect for?
___________________________________________
五. 词汇运用(每小题1分,共5分)
根据句意,用括号内所给单词的适当形式填空。
1. Jim has collected two hundred ________(stamp) since three years ago.
2. I looked around to see who was the ________(speak).5
3. He has to make a ________(choose) between the two shirts.
4. Mr. Liu, did I spell the word ________(correct)?
5. Don’t forget ________(mail) the letter to your sister.
六. 完成句子(每小题1分,共5分)
根据各题后括号内的要求完成下列各题,每空词数不限。
1. Is there a bank near your school? (补全否定答语)
No, _______________.
2. When does the park close? Do you know? (改为含宾语从句的复合句)
Do you know when _______________?
3. Mona doesn’t know what to do next. (改为同义句)
Mona doesn’t know what _______________ next.
4. The restrooms are behind the teaching building. (对划线部分提问)
_______________ the restrooms?
5. The girl felt scared at first. (对划线部分提问)
_______________ the girl feel at first?
七. 综合填空(每小题1分,共10分)
根据材料内容及首字母提示补全文中所缺单词。
Wanda and Tina studied at the same school and they were best friends. They a (1) ate together, played together and studied together. That’s w (2) Wanda was so surprised one day when Tina wouldn’t talk to her. She saved (保留) Tina a seat in the dining hall, b (3) when Tina came in she went off and sat by herself.
Wanda didn’t know what was w (4). Could Tina be angry with her? She thought about what she did and said recently. Was Tina upset because Wanda did b (5) on the history test than her? No, Tina didn’t c (6) about that kind of thing. She was happy that Wanda did well in school.
Wanda d (7) to find out what was the matter. She walked over to Tina. “Tina,” she said softly, “is something wrong?”
Tina l (8) up and was surprised to see Wanda standing next to her. “Oh, hi, Wanda,” she said. “Yes, something is wrong. My cat Zorro d (9) today. I feel really sad. Thanks for asking. You’re a true f (10).” Then she smiled. Wanda sat down next to her friend and gave her a big hug (拥抱).
八. 书面表达(20分)
外籍教师Mrs. Green应邀将在本周五下午来你们学校作报告。假如你是学生会主席张勤,请你根据以下提示用英语给Mrs. Green写一封电子邮件,告诉她如何到你们学校。
提示:1. 乘坐12路公共汽车到和平路下车,沿着和平路直走;
2. 在第二个十字路口向左拐,会看到一个超市;
3. 你们学校就在超市后面。
要求:1. 根据提示内容进行写作,可适当发挥;
2. 80词左右。电子邮件的格式已给出,不计入总词数。
Dear Mrs. Green,
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
Yours faithfully,
Zhang Qin
知识点是很重要的,甚至能提高我们自己的成绩。那么九年级上册英语第四单元知识点有哪些呢?以下是小编准备的一些初中九年级上册英语第四单元知识点,仅供参考。
一、单项选择 15%
( )1. — Our holiday cost a lot of money.
— Did it? Well, it doesn’t matter _____ we enjoyed ourselves.
A. unless B. so that C. as long as
( )2. — What are we supposed to do first if we want to develop our village?
— Lots of new roads _____, I think.
A. must built B. can build C. must be built
( )3. — It’s been five years _____ we met last time.
— Yes. What a long time!
A. when B. until C. since
( )4. —Wow! What a beautiful coat!
—I bought it in Suzhou last year. It’s _____ silk. It’s dear.
A. made of B. made from C. made in
( )5. I don’t know_____.
A. what to do B. where to do C. how to do
( )6. No one can say for _____ what they are talking about.
A. certain B. certainly C. true
( )7. Your DNA is _____ your parents’, but it is _____ others’.
A. the same as; different from B. similar to; different from C. different from; similar to
( )8. Our teacher often _____ us to think _____ ourselves.
A. makes; for B. lets; of C. warns; for
( )9. Two-fifths of the paintings _____ Spring.
A. is named for B. are named by C. are named after
( )10. The machine always works _____ , but yesterday it went_____
A. well; wrong B. badly; wrong C. well; bad
( )11. A Disneyland Park _____ in Shanghai Pudong New Area in the near future.
A. builds B. has built C. will be built
( )12. — When did China _____ Shenzhou Ⅶ, do you remember?
— In September, 2008. The astronaut Zhai Zhigang took the Chinese first spacewalk.
A. send up B. sent out C. put up
( )13. They were searching the whole playground _____ the _____ book.
A. for; lose B. of; missed C. for; lost
( )14. — What do you think of Qian Xuesen?
— He made a great contribution _____ developing the space science of China.
A. to B. for C. by
( )15. — Do you know the earth is bigger than Mars?
— Yes. The earth is _____ as Mars
A. four times big B. as four times big C. four times as big
二、完型填空 10%
Man has done much research in our universe. Man has even invented four kinds of satellites. The first kind of satellite studies the geography of 1 , our home. It is used to make maps and also help countries to see where they may 2 oil and gold.
The second kind of satellite is used to guide ships and planes. A ship or a plane can 3 a message to the satellite, and can find out where it is.
The third kind studies the weather. These satellites watch clouds and strong wind 4 across the earth. They warn countries to be ready when the 5 weather is coming. They 6 of the earth from thousands of miles above it and send the photos to weather stations on the ground.
7 kind is used for communication. Telephone calls 8 countries can be sent by these satellites. Some can carry hundreds of calls at one time. A call is sent to the satellite, then the 9 sends it to a station in the country. These satellites also carry pictures. They can 10 and send about eight pictures at a time. People can send pictures to each other by mobile phones.
( ) 1. A. the sun B. the moon C. the earth
( ) 2. A. buy B. choose C. find
( ) 3. A. get B. send C. put
( ) 4. A. moving B. running C. walking
( ) 5. A. fine B. bad C. sunny
( ) 6. A. take photos B. make drawing C. have a look
( ) 7. A. The other B. Another C. The last
( ) 8. A. between B. in C. from
( ) 9. A. man B. satellite C. telephone
( ) 10. A. take B. bring C. receive
三、口语运用 15%
A搭配左右两栏的.句子,组成意思通顺的对话。5%
( )1. Do you believe there are aliens? A. No, I haven’t.
( )2. What are you going to be? B. I’m afraid not.
( )3. Have you found any life on Mars? C. I want to be a dancer.
( )4. Let’s go to see the movie E.T. D. Because I’m not allowed to play soccer.
( )5. Why are you unhappy? E. Good idea. I can’t wait
B从方框里选择适当的句子完成对话使句间通顺 10%
A: Look at that strange thing. Kangkang! What’s that?
A. Who was it invented by?
B. When was it invented?
C. What’s it used for?
D. What was it made of?
E. How can I ride and fly it
B: It’s a key.
A: 1
B: It’s used for opening and locking our auto-bike.
A: Auto-bike? 2
B: It was invented by my father.
A: What’s it then?
B: It’s a battery-operated machine and it was invented by me!
A: That’s funny. 3
B: A few days ago.
A: 4
B: It was made of iron. And it’s used for riding or flying.
A: Flying? That sounds interesting. 5
B: You can just ride it like an auto-bike and it will fly as it goes fast enough.
四、阅读理解 40%
A 10%
根据短文内容,判断正(A)误(B)
How to Lose Weight
Jack Brown was very fat and his wife was worried about his weight.
“You should see the doctor.” She said. “ Ask him how to lose weight. It’s not good for your health.”
“OK.” Jack said, and he went to see a doctor.
The doctor weighed him. Then he said, “You are 50 kilos too heavy. You must lose at least 30 kilos. Eat only fruit and vegetables and run five kilometers a day for the next 100 days. Then call and tell me how much you weigh.”
Jack went home and did what the doctor told him. One hundred days later, he called the doctor.
“Jack Brown here, doctor,” he said, “ I'm calling to tell you about my weight. You will be happy to know that I have lost 30 kilos.” .
“Excellent, " the doctor said.
“Yes, but there's a problem,” Jack said. “ I'm 500 kilometers away from home now!”
( )1. Jack went to see a doctor in order to become thinner.
( )2. The doctor asked Jack to take some medicine.
( )3.Jack followed the doctor's advice and lost 50 kilos.
( )4.The doctor was pleased with Jack's efforts at losing weight.
( )5.Jack is so far from home because he didn't turn around.
B 10%
Few people knew his name or his face. But when he came back to the earth after a 21-hour trip to space, Yang Liwei’s smile was seen across the world.
The 38-year-old astronaut was sent into space at 9:00 a.m. October 15, 2003 by China’s Shenzhou V spaceship, and it traveled around the earth 14 times. He landed safely at 6:23 a.m. the next day. So China became the third country to successfully send a person into space, after the former Soviet Union(前苏联) and the U.S.A.
Yang was pleased with his job. “I think ours was one of the most successful,” he said.
If you saw the breaking-up of the space plane named Columbia(哥伦比亚号) in February of 2003, you would know that Yang Liwei would be in great danger.
Yang experienced very high temperature, while the gravitational forces(地心引力) on taking off(起飞) and landing was strong enough to make tears from his eyes.
He has spent five years training to become a spaceman after 1350 hours’ flying in the air. Although it was hard work, Yang loved it. Yang’s success was well worth all the hard work. Yang has become China’s first spaceman.
( ) 1. What time was Yang Liwei sent into space?
A. At 9:00 a.m. B. At 21 o’clock. C. At 6:23 a.m.
( ) 2. From the passage, we know China has become _____ to send a man into space.
A. the first one B. the second one C. the third one
( ) 3. Which sentence is right?
A. Yang Liwei was pleased with his job. B. Yang Liwei works hard on his work. C. A and B
( ) 4. Shenzhou V spaceship spent _____ traveling around the earth at a time.
A. one hour B. two hours C. one hour and a half
( ) 5. How many times did Yang Liwei go around the earth?
A. 21 times. B. 14 times. C. Only one time.
C 10%
Cye is said to be the best and cheapest home robot on the market. It can’t make the bed or take out the rubbish, but it can carry things, clean the house and find a charger(充电器) when its battery is flat! The most advanced (先进的) robot in the world is Honda’s famous “Asimo”. It can walk like a human and even walk up and down stairs! Sony’s “Aibo” is a home robot that looks and acts like a dog.
What can home robots do now? Here are some examples:
Cleaning
Home robots can vacuum(用吸尘器清扫) the house, even if you’re not at home.
Entertainment
Robotics(机器人技术) is an exciting hobby for many people around the world. There are a lot of clubs, websites, newspapers and books for those who are interested in the topic. Home robots can play games, tell jokes, sing songs and even dance to music!
Danger detection(探测)
It will be easy to connect fire, smoke and other detectors to a home robot. Every night the robot can “make the rounds” to make sure that everything is OK.
( )1.According to the passage, Cye can’t .
A. carry things B. clean the house C. make the bed or take out the rubbish
( )2.The most advanced robot in the world .
A. can’t find a charger B. looks and acts like a dog C. can walk up and down stairs
( )3. Which of the following is NOT true about home robots?
A. They can play games, tell jokes, and even dance to music.
B. They can’t vacuum the house when you’re not at home.
C. They can try their best to make sure that everything is OK in your house.
( )4. The underlined phrase “make the rounds” means “ ” in Chinese.
A. 巡视 B.转圈 C.翻滚
( )5. What’s the best title for the passage?
A. Home Robots and People
B. Home Robots Are Coming
C. The History of Home Robots
D 10%
Herb was at home alone one night while his parents were out. 1 , so he wasn’t afraid.As he waited for his parents to return home, he watched the late film on TV. His eyes became heavier and heavier as the time passed.
2 What was that noise in the next room? Herb heard the window slowly being inched open. For a minute Herb was so frightened that he could not move, and his body felt like ice.
3 and began to think of the things he could do, He couldn't reach the telephone without passing the windows, where he had heard the noise and he couldn't reach the door. Again he heard the sound of somebody trying to climb into his home through the window.
Herb's drums were standing in the corner near the TV. “ 4 ,” thought Herb. He picked up the drumsticks and beat his drums as he could. The commotion(振动声)was so terrible that Herb surprised even himself. He also surprised the person in the window, who ran away as fast as possible. The burglary(盗窃) was out of sight soon!
Herb had just used his drums in a very unusual way. “ 5 ,” thought Herb with a smile on his face.
阅读上面短文,把A.B.C.D.E五个句子填入文中空缺处,使短文内容完整正确。
A. Suddenly Herb's eyes were opened wide
B. Maybe drums aren't such bad instruments after all
C. He had often stayed alone before
D. He knew that he mustn't lose his head
E. Wait, maybe there is something I can do
五、综合填空 5%
根据短文内容,用所给单词的适当形式填空
leg fast write box strange
Shlander is a man from space. He thinks the people and things on the earth are very 1 . He is 2 a letter to his friend at home now. Here is part of his letter. Read it and answer the questions.
Now I am in a strange world. It is very nice. There are many new things here. There are many earth monsters(怪物) here, too. The earth monsters look very funny. They have just one head, two arms and two 3 . They have thin black strings on their heads. Some earth monsters have brown or yellow strings. The earth monsters have a hole in their face. Every day, they put nice things and balls from the trees into the hole. They pour water into the hole, too. The earth monsters do not walk very 4 . They move from place to pace in tin boxes.
At night, the earth monsters like to look at a square window 5 . This box has very small earth monsters in it.
六、词汇 10%
A选词填空 5%
1. Several (thief /thieves) stole some famous pictures from the museum last night.
2. Edison (invented / discovered) the light bulb.
3. We (expect / hope) him to come back tomorrow.
4. It is reported that some animals have been (canceled /cloned) me not to play too much.
5. Some spaceships have gone (beyond / before) the solar system.
B根据中文提示,完成句子 5%
1. cloning can help save those animals in danger (无疑地)
2.This film is a science fiction (以 ……为基础)
3.The book reading (值得)
4.I will believe there are aliens I see them with my own eyes. (直到……才)
5.I dancing singing songs. (喜欢……胜过)
七、遣词造句 10%
1 2 3 4 5
1. hand in , on time ________________________________________________________
2. make, carbon ________________________________________________________
3. use, cut _________________________________________________________
4. allow, in the office _________________________________________________________
5. wish, some day _________________________________________________________
八、书面表达: 15%
网络已成为人们生活中很重要的一部分。它为我们的工作与生活提供了许多便利。请你以I like the Internet 为题,写一篇80词左右的短文。
虽然在学习的道路上我们会遇到许多困难,但只要努力解决,你将会感觉到无比的轻松,那么九年级上册英语第二单元知识点有哪些呢?以下是小编准备的一些人教版九年级上册英语第二单元知识点,仅供参考。
Mooncake ['mu:nke?k] n. 月饼
lantern [?l?nt? (r)n] n. 灯笼
stranger [?streind?? (r)] n. 陌生人
relative [?rel?tiv] n. 亲属;亲戚
put on 增加(体重);发胖
pound [paund] n. 磅(重量单位);英镑
folk [f?uk] adj. 民间的;民俗的
goddess [?g?des][?ɡɑd?s] n. 女神
whoever [hu:?ev? pron.无论是谁;不管谁;任何人
steal [sti:l] v. (stole [st?ul], stolen [st?ul?n]) 偷;窃取
lay [lei] v. (laid [leid], laid) 放置;产(卵)
lay out 摆开;布置
dessert [di?z?:(r)t] n.( 饭后)甜点;甜食
garden [ga:(r)dn] n. 花园;园子
tradition [tr??d??n] n.传统
admire [?d?mai? (r)] v. 欣赏;仰慕
tie [tai] n. 领带 v. 捆;束
haunted [?h?:ntid] adj.有鬼魂出没的
ghost [g?ust] n. 鬼;鬼魂
trick [trik] n. 花招;把戏
treat [tri:t] n. 款待;招待;请客
spider [?spaid?r)] n. 蜘蛛
Christmas [?krism?s] n. 圣诞节
lie [laI] v. (lay [leI], lain [leIn]) 存在;平躺;处于
novel [?n?vl] [?na:vl] n.(长篇)小说
eve [i:v] n.(尤指宗教节假日的)前夕;前夜
dead [ded] adj.死的;失去生命的
business [?bizn?s] n. 生意;商业
punish [?p?nis] v. 处罚;惩罚
warn [w?:(r)n] v. 警告;告诫
end up 最终成为;最后处于
present [preznt] n. 现在;礼物 adj. 现在的
nobody [n?ub?di] [n?uba:di] pron. 没有人
warmth [w?:(r)mθ] n. 温暖;暖和
spread [spred] v. 传播;展开 n. 蔓延;传播
Macao [m??kau] 澳门
Chiang Mai [?t?i?n?maI], [d?a:nmaI] 清迈(泰城市)
Water Festiwal 泼水节
Mid-Autumn中秋节
Mother's Day母亲节
Father's Day 父亲节
Halloween [?h?l?u?i:n] 万圣节前夕
A Christmas Carol 《圣诞欢歌》(小说名)
Easter 复活节
Clara [?kla:r?] [?kler?] 克拉拉(女名)
Santa [?s?nt?] Claus [kl?:z] 圣诞老人
Charles [t?a:(r)lz] Dickens [?dik?nz] 查尔斯 ? 狄更斯(英)
Scrooge [skru:d?] 斯克鲁奇 n.(非正式)吝啬鬼
Jacob [?d?eik?b] Marley [?ma:(r)li] 雅各布 ? 马利
九年级上册英语第一单元主要讲解了语言基本功的学习和掌握,那么九年级上册英语第一单元知识点有哪些呢?以下是小编准备的一些九年级上册英语第一单元知识点,仅供参考。
一.单项选择(20分,每题1分)
i.词语释义(5分,每小题1分)
1.The cup is filled with milk.
A.is covered by B.is full of C.is full with D.is covered with
答案:B
2.Thet seem to be very happy with the actress.
A.satisfied with B.worried about C.pleased D.happy for
答案:A
3.Tom glanced at the watch and ran out of the classroom without saying anything.
A. took a look at B. threw away C. put down D. saw angrily
答案:A
4.The soldier jumped into the cold water to save the boy without hesitation.
A. after he thought about himself B. as soon as he saw him
C. because he realized that the boy was his son D. in order to tell others that he was brave
答案:B
5. My grandpa used to go for a walk after dinner.
A.did something regularly in the past
B.use something to do somthing
C.have experienced something and it has become a habit
答案:A
ii.选择填空(15分,每小题1分)
6.I _____________ whether his statement is true.
A.think B.believe C.doubt D.know
答案:C
7.The hall was ____________ of people.
A.fill B.filled C.full D.fulled
答案:C
8.We can’t work out the physical problem. Can you tell us____________?
A.how to do B.what to do it C.how to do it D.what should to do
答案:C
9.—The box is too heavy to carry. What’s in it?
—Oh, it is ____________books.
A.filled with B.covered with C.used for D.asked for
答案:A
10.___________ a beautiful car!I’ve never seen it before.
A.What B.Which C.How D.Whether
答案:A
11.She is from England, ____________she?
A.isn’t B.won’t C.hasn’t D.doesn’t
答案:A
12.—Could I use your bike today?
—________________.I’m not using it.
A.Sure,go ahead B.I have no idea C.No,you can’t D.Never mind
答案:A
13.—What else do you need for your trip?
—__________.I’ve packed everything.
A.Something else B.Else everything C.Nothing else D.Else nothing
答案:C
14.—Why don’t you go out to play?
—I’m afraid I can’t. I have much homework___________.
A.do B.does C.doing D.to do
答案:D
15.—Your sweater looks very nice. What’s it made________?
—Wool.
A.by B.of C.from D.in
答案:B
16.—___________weather it is!
—Yes, we can’t go boating on the Xuanwu lake.
A.What good B.How good C.How bad D.What bad
答案:D
17.Tom had his 15th birthday party last night, ___________?
A.didn’t he B.did he C.hadn’t he D.was he
答案:A
解析:反意疑问句。主句是肯定句式,所以反意疑问句要用否定,并且借助助动词did.
18.I don’t think the newly-directed film by Zhaowei is as interesting as people say, _______?
A. do you B. isn’t it C. is it D. don’t you
答案:C
19.—__________ does your new friend look like?
—He is tall with short blonde hair and big blue eyes.
A. How B. What C. Who D. Where
答案:B
20.—Jim had nothing for breakfast this morning, _______?
—______. He got up too late.
A. had she; Yes B. hadn’t he; Yes C. did he; No
答案:C
二.完形填空(10分,每小题1分)
One day a poor man was traveling on horseback. At noon, he tied his horse to a tree and
then 1 to eat something. A few minutes later, a rich man came along and tied his horse to
the same tree.
“Please tie your horse to another tree,” said the poor man.“My horse is wild(野蛮的). It will kill yours.”
2 the rich man said,“I shall tie my horse as I like!” he tied up his horse and had his
lunch nearby. After a moment they heard a terrible 3 , the two horses were fighting. They went up to them, but it was too 4 . The rich man‘s horse was killed. “See what you horse
has done!”cried the rich man. “You will have to 5 it.”And he brought the poor man before Mr. Know.
Mr. Know asked the poor man some questions. But he made no 6 . At last Mr. Know said,
“This man is dumb(哑的). He cannot speak.”
“Oh,” the rich man shouted 7 .“He can! He spoke to me when I met him.”
“Are you sure?” asked Mr. Know.“What did he 8 ?”
“He told me not to tie my horse to the same tree because his horse was wild and would
kill my horse.”
“Oh,” said Mr. Know.“So he 9 you. Then can you expect to get money 10 him? ”
The rich man said nothing and left silently.
( )1. A. put down B. set down C. sat down D. turned down
( )2. A. So B. But C. And D. Though
( )3. A. song B. word C. bell D. noise
( )4. A. late B. slow C. hard D. quick
( )5. A. pay for B. look for C. wait for D. care for
( )6. A. idea B. mistake C. money D. answer
( )7. A. quietly B. angrily C. happily D. heavily
( )8. A. speak B. tell C. talk D. say
( )9. A. helped B. thanked C. warned D. ordered
( )10.A. for B. from C. with D. about
答案:1-5 C B D A A 6-10 D B D C B
三.阅读理解(35分,每小题1分)
i. 阅读下列短文,从每小题的A、B、C、D四个选项中选择最佳答案(25分,每小题1分)
A
Rachel felt sad as she walked to the school bus stop. Her neighborhood looked like a junkyard. There was a lot of rubbish on the road. The front door to Lee‘s Grocery was covered with ugly graffiti(涂鸦).
Yuck! Rachel said as she brought her foot back to kick (踢) an empty bottle off. Then she changed her mind, picked the bottle up and threw it into a rubbish basket on the corner. She hurried to meet her friends at the bus stop.
Mr Lee felt sad as he looked out of his grocery store window. Hmph, he said as the girl passed by. She‘s perhaps another troublemaker, he thought. One of those kids painted graffiti all over my door. Kids today are just no good. What the girl did next, though, surprised him. She picked up the bottle and dropped it into a rubbish basket.
That‘s a switch, thought Mr Lee. All morning he kept picturing that girl. At noon, when he walked to the corner to mail a letter, he saw the rubbish that was in front of his store. He thought of that girl again, then got a broom and started sweeping(打扫) the walk.
( ) 1. Where would Rachel go when she saw the empty bottle?
A. To school. B. To a party. C. To hospital. D. To her grandma‘s.
( ) 2. What might be the reason that Mr Lee started sweeping the walk?
A. His wife asked him to do so.
B. He saw Rachel placing a bottle into the rubbish basket.
C. He wanted more people to buy things in his store.
D. He heard other people say something bad about his store.
( ) 3. Who might learn most from reading this story?
A. Someone who wants to buy some nice trees. .
B. Someone who wants to get along with a bad neighbor.
C. Someone who wants to plant a flower garden.
D. Someone who wants to make a difference in the neighborhood.
( ) 4. What does the underlined word trouble-maker mean in Chinese?
A. 幸运者 B. 送货人 C. 捣乱者 D. 顾客
( ) 5. What is this story mostly about?
A. How a group of people learn to be friends.
B. A neighborhood that learns to reuse bottles.
C. How one person‘s actions (行动) can make others change.
D. Neighbors working together to do their spring cleaning.
答案:1-5 A B D C C
B
Do you get angry when someone stands too close to you or talks too loudly?
Many of us do. What makes us feel uncomfortable about these people? Perhaps it‘s about
personal space.
Some scientists say that humans need a distance between themselves and strangers.
Personal space means not only space around the body, but around the senses (感官). People may feel uncomfortable when with sounds, smells or for some people don‘t like
the sound of a man shouting into a mobile phone in a shop. Or maybe they don‘t like sitting next to a woman on a bus with a lot of perfume (香水) on.
While people like to protect their personal space, they may not know they are doing it.
Manypeople hold newspapers in front of them on the subway. Perhaps they are using the newspaper to separate (分离) themselves from other people.
How much people care about personal space is different from culture to culture.Some
scientists say that people in the US need more personal space than people in other countries.
But in Latin cultures, people are more comfortable standing close to each other.
( )6. What does the passage mainly tell us about?
A. How to get angry. B. Personal space.
C. Different cultures. D. Understanding each other.
( )7. Which of the following statements is true, according to the scientists?
A. People in the US need the most personal space.
B. In Latin cultures, people feel uncomfortable if others get very close to them.
C. Personal space only means space around the body.
D. People are always aware that they are protecting their personal space.
( )8. Which of the following is NOT an example of behavior that hurts personal space in the
story?
A. Talking loudly into a mobile phone. B. Wearing dirty clothes at a party.
C. Wearing too much perfume. D. Standing too close to somebody.
( )9. According to the scientists, if people hold a newspaper closely, they ______.
A. just want to read it.
B. are probably thinking about some problem.
C. are probably protecting their personal space, but don’t realize it.
D. probably like reading very much.
( )10.According to this passage, people will feel uncomfortable _____________.
A. when someone stands too close to you.
B. when with certain sounds
C. when with certain smells or looks
D. all the above.
答案:6-10 B A B C D
C
On December 14, 1911, Norwegian scientist Amundsen and his four team members became the first people to reach the South Pole (南极).On Wednesday, exactly 100 years later, Norway‘s prime ministers remembered them with scientists at the bottom of the South Pole.
In the early 1900s, there was a race to see who could get to the South Pole first. Amundsen beat British scientist Scott by five weeks. On March 8, 1912, after learning of Amundsen‘s success, The New York Times wrote, A new world has now been discovered.
After learning that American scientist Robert had reached the North Pole first in April 1909, Amundsen made secret plans for a trip to the South Pole.
On October 19, 1911, Amundsen set out with 52 dogs. His success was helped by careful planning. And his dogs also helped. Amundsen and his four team members, together along with 11 dogs, made it back on January 25, 1912. Their trip was quicker than expected(期待).
Antarctica(南极洲), is a place for many science projects. It holds many clues(线索) to the earth‘s past and future changes. Especially there are many things about weather change.
( ) 11. How many dogs died during the trip?
A. 63. B. 52. C. 41. D. 11.
( ) 12. What made Amundsen decide to travel to the South Pole?
A. The fact that Robert bad reached the North Pole. B. His dream.
C. A book. D. A story.
( ) 13. What helped him succeed?
A. Careful planning and his dogs. B. Norway‘s prime minister.
C. Good weather. D. Many clues in Antarctica.
( ) 14. What can we learn best in Antarctica?
A. Mountain change. B. River change. C. Forest change. D. Weather change.
( ) 15. The passage is mainly about ______.
A. the earth‘s past and future B. a great scientist who reached the South Pole
C. special Antarctica D. Norway‘s prime minister
答案:11-15 C A A D B
D
IN Journey to the West (《西游记》), the Monkey King often turns into a bug (虫子) and watches monsters. Today, scientists are trying to turn the story into reality by making
robt bugs.
Robot bugs are small robots that look like bugs. People can use them to take pictures
in dangerousareas, follow suspects(嫌犯),or help find survivors in broken buildings.Work on robotic bugs started after World War II. But today they are more advanced.
Harvard University scientists have made a very small robot that looks like a fly. It weighs
just 65 milligrams, or a little more than the plastic head of a push pin (大头钉). The robot needs a wire (电线) to get power.
Japanese scientists don‘t need wires for their robots. They have made very small ones
that look like moths (蛾). People control the robots by radio.
Scientists are trying to turn real bugs into robots. US scientists have put computer chips
(芯片) into moths so people can control them.
But sometimes these robots get into danger. Birds can eat them. Other times they can get
caught in spiders‘ webs (网).
( )16. The passage mainly tells us about_______.
A. making robot bugs B. robot bugs
C. what robot bugs look like D. what robot bugs can do
( )17. The robot which was made by Harvard University scientists is like ______.
A. a fly B. a dragonfly C. a moth D. a butterfly
( )18. These robot bugs have many advantages except_____.
A. they can be used to take pictures in dangerous areas
B. they can follow suspects
C. they can be eaten by birds
D. they can help find survivors in destroyed buildings
( )19. In the future people will be able to control a real moth ______.
A. using a wire B. with a radio C. using a telephone D. with a computer chip
( )20. According to the passage which statement is true?
A. US scientists have made a very small robot that looks like a moth.
B. Japanese scientists have made very small robots that look like flies.
C. The robot fly can only fly when it is connected to a power wire.
D. Scientists began to work on the robot bugs after World War I.
答案:16-20 B A C D C
E
Anuska‘s first day in Seattle was tiring. Her father had arrived several days earlier to begin moving boxes. He met Anuska and her mother at the airport and drove them to their new apartment. The family spent the day unpacking boxes.
Anuska was tired, but she wanted to see more of Seattle. Her parents said that they would go out and explore(探索) Seattle the next day.
Anuska and her mother went out of the front door for a rest. Then Anuska heard a voice.
Hello. You must be new here. Anuska turned to see a girl smiling at her. Yes, she said. We just moved here this morning.
My name is Tisha. I live next door.
I‘m Anuska. We moved here from Alaska.
Alaska? Wow, I‘ve never met anybody from Alaska, said Tisha.
What school are you going to?
My mom says I‘m going to that school. .
That‘s my school, Tisha replied. Maybe we‘ll be in the same class.
Anuska smiled. It would be nice to start school and already know someone.
Tisha‘s eyes suddenly got wide. Have you ever been to an aquarium(水族馆)?
Anuska shook her head.
They have all kinds of sea animals there. I‘m going with my older brother tomorrow. Do you and your parents want to come with us?
Anuska looked at her mother.
I think that‘s a good idea, her mother said. We should go out and see some of Seattle. This is a good chance.
( ) 21. How did Anuska and her mother go to Seattle?
A. By car. B. By bus. C. By train. D. By air.
( ) 22. How did Anuska and her parents spend their first day in Seattle?
A. Meeting Tisha‘s family. B. Looking for a new school.
C. Unpacking boxes. D. Walking through the city.
( ) 23. What will Anuska do tomorrow?
A. Go back to Alaska. B. Go to her new school.
C. Go to see fishes. D. Go to visit Tisha.
( ) 24. Which word best describes Tisha?
A. Worried. B. Shy. C. Serious. D. Welcoming.
( ) 25. What‘s the best title for the passage?
A. Anuska‘s first day in Seattle. B. Anuska‘s new neighbor.
C. Anuska‘s mother. D. Anuska‘s family exploring Seattle.
答案:21-25 D C C D B
ii. 选择下列单词或者短语完成对话。(5分,每小题1分)
( A student and a teacher are talking )
A: Excuse me, could you give me some (1)___________?
B: Sure. What do you want to know?
A: How can I (2)_________ my English?
B: It might be a good idea if you practice (3)_________ English as much as you can.
A: Not a bad idea!
B: And if I were you, I‘d like to (4)__________ the English radio programs every day.
A: OK, I‘ll try.
B: If you (5)_________ any help, please come to ask me anytime.
A: Thanks. I will.
B: You‘re welcome.
1._________ 2. __________ 3.__________ 4._________ 5. _________
答案:1.advice 2.improve 3.speaking 4.listen to 5.need
iii. 选择下列选项完成下面对话。(5分,每小题1分)
A: Hi, Mike. Would you like to help save the environment?
B: Of course, I would like to. But what should I do firstly?
A: Well. (1) _________
B: Yes, it‘s a piece of cake. Sometimes I turn off the lights without thinking. What‘s next?
A: Secondly, you can ride a bicycle. (2) __________
B: That will save money, too. What else?
A: Thirdly, try to recycle(回收) paper.
B: Mm. Newspapers, magazines, mail ... (3) __________ Good idea.
A: The fourth idea is turning off the shower when you are not using it.
B: You mean when I have shampoo in my hair?
A: Yes. Get wet, (4) _________, put the shampoo in your hair and then turn on the shower and wash it out.
B: Will that help the environment?
A: Yes, we have to save water. And fifthly, take a bag when you go shopping. (5) __________
B: OK. My parents do most of the shopping. I‘ll tell them.
答案:1.A 2.D 3.F 4.G 5.B
四. 用所给词汇的适当形式填空。(10分,每小题1分)
1.I’m looking forward to the O___________ Games.
2.According to an __________(古老的)Chinese legend, the emperor Shen Nong discovered tea.
3.Would you like ___________( sell ) the ticket to me?
4.The fields around us looked like a ________(gold) sea.
5.—How do you study English?
—By __________ ( ask ) teachers for help.
6.I think the way we say something is____________( important ) than the thing we say.
7.Can you give me some____________ ( advise ) ?
8. You’ll ____________(解决)the problem if you concentrate on it.
9. What he did is to make a good ______________ (impress) on his boss.
10. We must find out the ___________(true)of the matter
答案:1.Olympic 2.ancient 3.to sell 4.golden 5.asking
6.more important 7.advise 8.solve 9.impression 10.truth
五. 书面表达(10分)
假如你是Jim. 你的朋友Simon 邀请你参加本周六的同学聚会,但你因为要去医院照顾生病的母亲而无法前往。请给Simon回复。要求:条理清楚,格式正确。日期为9月11日。