期中考试试题

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初中期中考试试题及答案

初中期中考试试题及答案

初中期中考试试题及答案一、选择题(每题2分,共20分)1. 下列哪个选项是正确的?A. 地球是宇宙的中心B. 地球围绕太阳转C. 太阳围绕地球转D. 地球是静止不动的答案:B2. 以下哪位科学家提出了相对论?A. 牛顿B. 爱因斯坦C. 伽利略D. 霍金答案:B3. 以下哪种植物是被子植物?A. 松树B. 蕨类C. 苔藓D. 银杏答案:D4. 以下哪个国家是亚洲国家?A. 巴西B. 阿根廷C. 韩国D. 墨西哥答案:C5. 以下哪个选项是化学变化?A. 水的沸腾B. 铁的生锈C. 玻璃的破碎D. 冰的融化答案:B6. 以下哪个朝代是中国历史上的最后一个封建王朝?A. 唐朝B. 宋朝C. 明朝D. 清朝答案:D7. 以下哪个国家是联合国常任理事国之一?A. 德国B. 巴西C. 印度D. 法国答案:D8. 以下哪种动物是哺乳动物?A. 蛇B. 鸟C. 鱼D. 蝙蝠答案:D9. 以下哪个选项是正确的?A. 光在真空中的速度是最快的B. 声音在真空中可以传播C. 光在空气中的速度比真空中慢D. 声音在空气中的速度比水中快答案:A10. 以下哪个选项是正确的?A. 0是自然数B. 0不是自然数C. 0是整数但不是自然数D. 0既不是自然数也不是整数答案:A二、填空题(每题2分,共20分)1. 地球的自转周期是_________小时。

答案:242. 牛顿第三定律指的是作用力和__________。

答案:反作用力3. 植物的光合作用主要发生在__________。

答案:叶绿体4. 亚洲最大的国家是__________。

答案:中国5. 相对论包括狭义相对论和__________相对论。

答案:广义6. 唐朝的开国皇帝是__________。

答案:李渊7. 联合国的总部位于__________。

答案:纽约8. 哺乳动物的主要特征包括__________和哺乳。

答案:胎生9. 光在真空中的速度是__________米/秒。

期中考试题库及答案

期中考试题库及答案

期中考试题库及答案一、单项选择题(每题2分,共20分)1. 以下哪个选项是正确的?A. 地球是平的B. 地球是圆的C. 地球是三角形的D. 地球是正方形的答案:B2. 世界上最长的河流是?A. 亚马逊河B. 尼罗河C. 长江D. 密西西比河答案:A3. 以下哪个国家是位于南美洲的?A. 加拿大B. 巴西C. 澳大利亚D. 南非答案:B4. 以下哪个选项是计算机的基本组成部分之一?A. 键盘B. 鼠标C. 显示器D. 以上都是答案:D5. 以下哪个选项是人体最大的器官?A. 心脏B. 肝脏C. 皮肤D. 肺答案:C6. 以下哪个选项是正确的?A. 光速是宇宙中最快的速度B. 光速是宇宙中最慢的速度C. 光速是宇宙中唯一的速度D. 光速是宇宙中唯一的速度答案:A7. 以下哪个选项是正确的?A. 氧气是人体必需的B. 二氧化碳是人体必需的C. 氮气是人体必需的D. 氦气是人体必需的答案:A8. 以下哪个选项是正确的?A. 牛顿是物理学家B. 爱因斯坦是化学家C. 达尔文是数学家D. 霍金是生物学家答案:A9. 以下哪个选项是正确的?A. 地球的自转周期是24小时B. 地球的公转周期是24小时C. 地球的自转周期是365天D. 地球的公转周期是365天答案:A10. 以下哪个选项是正确的?A. 1公斤等于1000克B. 1公斤等于100克C. 1公斤等于10克D. 1公斤等于1克答案:A二、填空题(每题2分,共20分)1. 地球的自转方向是________。

答案:自西向东2. 人体最大的淋巴器官是________。

答案:脾3. 计算机的中央处理器简称为________。

答案:CPU4. 光年是天文学中用来表示________的单位。

答案:距离5. 人体最长的神经是________。

答案:坐骨神经6. 牛顿的三大定律是________、________和________。

答案:第一定律、第二定律、第三定律7. 人体最大的消化腺是________。

七年级上册数学期中考试试卷附答案

七年级上册数学期中考试试卷附答案

七年级上册数学期中考试试题2022年一、单选题1.据媒体报道,我国因环境污染造成的巨大经济损失,每年高达680000000元,这个数用科学记数法表示正确的是()A .6.8×109元B .6.8×108元C .6.8×107元D .6.8×106元2.如果向东为正,那么-50m 表示的意义是()A .向东行进50mB .向南行进50mC .向西行进50mD .向北行进50m 3.下列计算正确..的是()A .(3)21-+=B .(3)21--=-C .(2)(1)(2)-⨯-=-D .(6)23-÷=-4.2--的相反数是()A .12-B .2-C .12D .25.已知有理数a 、b 在数轴上对应的点如图所示,则下列式子正确的是()A .a•b >0B .a+b <0C .|a|<|b|D .a ﹣b >06.下列代数式3a ,﹣xy ,2x,10,x ﹣y ,b ,2x 2y 3中,单项式有()个.A .3B .4C .5D .67.下列各组是同类项的一组是()A .xy 2与﹣12x 2yB .3x 2y 与﹣3xyzC .﹣a 3b 与12ba 3D .a 3与b 38.一个多项式与x 2﹣2x+1的和是3x ﹣2,则这个多项式为()A .x 2﹣5x+3B .﹣x 2+x ﹣3C .﹣x 2+5x ﹣3D .x 2﹣5x ﹣139.对于有理数a ,b ,定义一种新运算,规定a※b =﹣a 2﹣b ,则(﹣2)※(﹣3)=()A .7B .1C .﹣7D .﹣110.某公园计划砌一个形状如图(1)的喷水池(图中长度单位:m ),后来有人建议改为图(2)的形状,且外圆的直径不变,请你比较两种方案,砌各圆形水池的周边需要的材料多的是()(提示:比较两种方案中各圆形水池周长的和)A .图(1)B .图(2)C .一样多D .无法确定二、填空题11.计算:4ab 2﹣5ab 2=_______,(﹣25)﹣(﹣35)=_______,10÷3×13=______.12.多项式1﹣3x ﹣2xy ﹣4xy 2是___次___项式,其中二次项是___.13.数轴上有一点A 对应的数为﹣2,在该数轴上有另一点B ,点B 与点A 相距3个单位长度,则点B 所对应的有理数是_______.14.列代数式表示:“a ,b 和的平方减去它们差的平方”为________________.15.若ab =﹣2,a+b =3,那么2a ﹣ab+2b 的值为___.16.单项式2332a b π的系数是__,次数是__.17.下列图案是晋商大院窗格的一部分,其中“○”代表窗纸上所贴的剪纸,则第n 个图中所贴剪纸“○”的个数为_____个.三、解答题18.计算题:(1)13﹣(﹣18)+(﹣7)﹣15;(2)﹣24+(﹣3)3﹣(﹣1)10;(3)12﹣6÷(﹣3)﹣22332⨯;(4)﹣|﹣23|﹣|﹣12÷32|﹣(1341-).19.整式的计算:(1)4x 2﹣5x+2+x 2+3x ﹣4;(2)(8a ﹣7b )﹣2(4a ﹣5b );(3)3x 2﹣[5x ﹣(12x ﹣3)+2x 2].20.有8筐白菜,以每筐25千克为准,超过的千克数记作正数,不足的千克数记作负数,称后的记录如下:2,﹣3,1.5,﹣0.5,1,﹣2,﹣1.5,﹣2.5.(1)这8筐白菜中,最重的一筐白菜比最轻的一筐白菜重了多少千克?(2)若白菜每千克售价3元,则出售这8筐白菜可卖多少元?21.已知多项式A =2x 2-xy ,B =x 2+xy -6,求:(1)4A -B ;(2)当x =1,y =-2时,求4A -B 的值.22.化简求值:4xy-(2x 2+5xy-y 2)+2(x 2+3xy),其中212(02x y ++-=..23.两船从同一港口同时出发反向而行,甲船顺水,乙船逆水,两船在静水中的速度都是40km/h ,水流速度是akm/h .(1)3h 后两船相距多远?(2)4h 后甲船比乙船多航行多少千米?24.阅读理解,并解答问题:观察下列各式:11112122==-⨯,111162323==-⨯,1111123434==-⨯,......,请利用上述规律计算(要求写出计算过程):(1)1111111261220304256++++++;(2)11111111335577991111131315++++++⨯⨯⨯⨯⨯⨯⨯.25.阅读下列材料:我们知道(0)0(0)(0)x x x x x x >⎧⎪==⎨⎪-<⎩现在我们可以用这个结论来化简含有绝对值的代数式,如化简代数式12x x ++-时,令10x +=,求得1x =-;令20x -=,求得2x =(称-1,2分别为1x +,2x -的零点值).在有理数范围内,零点值-1和2可将全体有理数分成不重复且不遗漏的如下3种情况:①当1x <-时,原式()()1221x x x =-+--=-+;②当12x -≤≤时,原式()123x x =+--=;③当2x >时,原式1221x x x =++-=-.综上所述,21(1)123(12)21(2)x x x x x x x -+<-⎧⎪++-=-≤≤⎨⎪->⎩通过以上阅读,请你解决以下问:(1)分别求出2x +和4x -的零点值;(2)化简代数式24x x ++-.26.探究性问题:在数学活动中,小明为了求23411112222++++……+12n 的值(结果用含n 的式子表示).设计了如图1所示的几何图形.(1)利用这个几何图形,求出23411112222++++ (12)的值为;(2)利用图2,再设计一个能求23411112222++++ (12)的值的几何图形.参考答案1.B 【解析】【详解】680000000元=6.8×108元.故选:B .【点睛】考点:科学记数法—表示较大的数.2.C 【解析】【分析】首先审清题意,明确“正”和“负”所表示的意义;再根据题意作答.【详解】∵向东为正,∴-50m表示的意义为向西50m.故选C.【点睛】本题考查正负数的意义,解题关键是理解“正”和“负”的相对性,明确什么是一对具有相反意义的量.3.D【解析】【分析】根据有理数加、减、乘、除运算法则计算出各项的结果,再进行判断即可.【详解】-+=--=-,选项A计算错误,故不符合题意;解:A.(3)2(32)1--=-+=-,选项B计算错误,故不符合题意;B.(3)2(32)5-⨯-=⨯=,选项C计算错误,故不符合题意;C.(2)(1)212-÷=-÷=-,计算正确,符合题意.D.(6)2(62)3故选:D.【点睛】本题考查了有理数的混合运算,解答本题的关键是有理数混合运算的计算方法.4.D【解析】【分析】|-2|去掉绝对值后为2,而-2的相反数为2.【详解】2--的相反数是2,故选:D.【点睛】本题考查了相反数和绝对值的概念,本题的关键是首先要对原题进行化简,然后在求这个数的相反数;其中,正数的相反数是负数,负数的相反数是正数,0的相反数是0.5.D【解析】【详解】试题解析:由数轴可知:10,1 2.b a -<<<<A.0,ab <故错误.B.0.a b +>故错误.C.,a b >故错误.D.0.a b ->正确.故选:D .6.C 【解析】【分析】单项式:数字与字母的积,单个的数或单个的字母也是单项式,根据定义逐一判断即可得到答案.【详解】解:代数式3a ,﹣xy ,2x,10,x ﹣y ,b ,2x 2y 3中,单项式有:23,,10,,2,3axy b x y -共5个,故选C 【点睛】本题考查的是单项式的定义,熟练的运用单项式的概念判断代数式是否是单项式是解本题的关键.7.C 【解析】【分析】根据同类项是字母相同,且相同的字母的指数也相同解答即可.【详解】解:A .字母相同,但相同的字母的指数不相同,不是同类项,故此选项不符合题意;B .所含字母不尽相同,不是同类项,故此选项不符合题;C .字母相同,且相同的字母的指数也相同,故此选项符合题意;D .字母不同,不是同类项,故此选项不符合题意;故选:C .【点睛】本题考查了同类项,关键是根据同类项是所含字母相同,并且相同字母的指数也相同解答.8.C 【解析】【分析】设这个多项式为A ,根据整式的加减即可求出答案.【详解】解:设这个多项式为A ,∴A+(x 2﹣2x+1)=3x ﹣2∴A =3x ﹣2﹣(x 2﹣2x+1)=3x ﹣2﹣x 2+2x ﹣1=﹣x 2+5x ﹣3故选C .【点睛】本题考查整式的加减,掌握去括号和合并同类项是关键.9.D 【解析】【分析】由新定义列式可得:()()223,----再先计算乘方,最后计算加减运算即可.【详解】解: a※b =﹣a 2﹣b ,(﹣2)※(﹣3)=()()223431,----=-+=-故选D 【点睛】本题考查的是新定义运算,含乘方的有理数的混合运算,理解新定义的运算法则是解本题的关键.10.C 【分析】利用圆的周长公式直接计算即可得到答案.11.2ab -15或者0.2109或者1110【解析】【分析】把同类项的系数相减,字母与字母的指数不变,可得第一空的答案;先把减法转化为加法,再计算加法可得第二空的答案;先把除法转化为乘法,再计算乘法运算即可得到第三空的答案.【详解】解:4ab 2﹣5ab 2=()2245,ab ab -=-(﹣25)﹣(﹣35)=231,555-+=10÷3×13=111010,339⨯⨯=故答案为:2110,,59ab -【点睛】本题考查的是合并同类项,有理数的减法运算,有理数的乘除混合运算,易错点是计算乘除同级运算时,不注意运算顺序.12.三四−2xy .【解析】【分析】直接利用几个单项式的和叫做多项式,每个单项式叫做多项式的项,其中不含字母的项叫做常数项.多项式中次数最高的项的次数叫做多项式的次数,进而得出答案.【详解】解:多项式1﹣3x ﹣2xy ﹣4xy 2是三次四项式,其中二次项是:−2xy .故答案为:三,四,−2xy .【点睛】此题主要考查了多项式,正确掌握多项式的相关次数确定方法是解题关键.13.1或5-##5-或1【解析】【分析】由数轴上有一点A 对应的数为﹣2,数轴上有另一点B ,点B 与点A 相距3个单位长度,则把表示2-的点向左边或右边移动3个单位即可得到答案.【详解】解: 数轴上有一点A 对应的数为﹣2,数轴上有另一点B ,点B 与点A 相距3个单位长度,231∴-+=或235,--=-B ∴对应的数为:1或5-故答案为:1或5-【点睛】本题考查的是数轴上两点之间的距离,有理数的加法与减法运算,掌握“数轴上两点之间的距离的含义”是解题的关键.14.(a +b )2−(a−b )2【解析】【分析】先列两个数和再平方,然后减去它们差的平方即可列出代数式.【详解】解:a ,b 和的平方减去它们差的平方,列出代数式为:(a +b )2−(a−b )2,故答案为:(a +b )2−(a−b )2.【点睛】本题考查了列代数式,解题的关键是理解题意准确列出代数式.15.8【解析】【分析】先把原式化为:()2,a b ab +-再整体代入代数式求值即可.【详解】解: ab =﹣2,a+b =3,∴2a ﹣ab+2b ()2a b ab=+-()=232628,´--=+=故答案为:8【点睛】本题考查的是代数式的值,掌握“整体代入法求解代数式的值”是解题的关键.16.32π5【解析】【分析】根据单项式的定义即可得【详解】因为单项式中的数字因数叫单项式的系数,所有字母的指数和叫单项式的次数,所以32πa2b3.的系数是32π,次数是5.【点睛】本题考查的知识点是单项式,解题的关键是熟练的掌握单项式. 17.3n+2【解析】【详解】解:第一个图案为3+2=5个窗花;第二个图案为2×3+2=8个窗花;第三个图案为3×3+2=11个窗花;…从而可以探究:第n个图案所贴窗花数为(3n+2)个.故答案为:3n+218.(1)9;(2)44-;(3)10;(4)11 12 -【解析】【分析】(1)先把运算统一为省略加号的和的形式,再计算即可;(2)先计算乘方运算,再计算减法运算即可;(3)先计算乘除运算,再计算加减运算即可;(4)先化简绝对值与计算括号内的运算,再计算减法运算即可.【详解】解:(1)13﹣(﹣18)+(﹣7)﹣151318715=+--31229=-=;(2)﹣24+(﹣3)3﹣(﹣1)10 1627144=---=-;(3)12﹣6÷(﹣3)﹣223 32⨯83 12232 =+-⨯14410 =-=;(4)﹣|﹣23|﹣|﹣12÷32|﹣(1341-)212132312=--⨯-2113312=---11111212=--=-【点睛】本题考查的是含乘方的有理数的混合运算,掌握“有理数的混合运算的运算顺序与运算法则”是解题的关键.19.(1)2522x x--;(2)3b;(3)293 2x x--【解析】【分析】(1)直接把同类项的系数相加减,字母与字母的指数不变,从而可得答案;(2)先去括号,再合并同类项即可;(3)先去小括号,再去中括号,再合并同类项即可得到答案.【详解】解:(1)4x2﹣5x+2+x2+3x﹣42522x x=--(2)(8a﹣7b)﹣2(4a﹣5b)87810a b a b=--+3b=(3)3x2﹣[5x﹣(12x﹣3)+2x2]22135322x x x x ⎛⎫=--++ ⎪⎝⎭22135322x x x x =-+--2932x x =--【点睛】本题考查的是整式的化简求值,熟练的运用去括号,合并同类项是解本题的关键.20.(1)4.5千克;(2)585元【解析】【分析】(1)由超过最多的一筐减去不足最多的一筐可得答案;(2)先求解这8筐白菜的总重量,再乘以单价即可得到答案.【详解】解:(1)8筐白菜中,最重的一筐白菜比最轻的一筐白菜重:()1.53 1.53 4.5--=+=千克.(2)()()()()()23 1.50.512 1.5 2.5+-++-++-+-+-Q 5,=-∴这8筐白菜的总重量为:8255195´-=千克,所以白菜每千克售价3元,出售这8筐白菜可卖:1953=585´元.【点睛】本题考查的是正负数的应用,有理数的加法与乘法的实际应用,理解题意,列出正确的运算式是解本题的关键.21.(1)7x 2-5xy +6;(2)23【解析】【分析】(1)本题考查了整式的加减,列式时注意加括号,然后去括号合并同类项;(2)本题考查了求代数式的值,把x=1,y=﹣2代入到(1)化简得结果中求值即可.【详解】解:(1)∵多项式A=2x 2﹣xy ,B=x 2+xy ﹣6,∴4A ﹣B=4(2x 2﹣xy )﹣(x 2+xy ﹣6)=8x 2﹣4xy ﹣x 2﹣xy+6=7x 2﹣5xy+6;(2)∵由(1)知,4A ﹣B=7x 2﹣5xy+6,∴当x=1,y=﹣2时,原式=7×12﹣5×1×(﹣2)+6=7+10+6=23.22.25xy y +,﹣434【解析】【分析】首先去括号合并同类项,再得出x ,y 的值代入即可.【详解】解:原式=22242523xy x xy y x xy -+-++()()22242526xy x xy y x xy =--+++25xy y =+,∵21202x y ++-=(,∴x=﹣2,y=12,故原式=5×(﹣2)×12+14=﹣434.23.(1)240km ;(2)8a km 【解析】【分析】(1)先表示顺水,逆水航行的速度,再求解两船航行3小时的路程和即可;(2)利用甲船航行4小时的路程减去乙船航行4小时的路程即可.【详解】解:(1) 船在顺水中的速度为:()40a +km/h ,船在逆水中的速度为:()40a -km/h ,∴3h 后两船相距:()()34034012031203240a a a a ++-=++-=km.(2)4h 后甲船比乙船多航行:()()440440*********a a a a a +--=+-+=km.本题考查的是列代数式,整式的加减运算,掌握“船在顺水中的速度为:()40a +km/h ,船在逆水中的速度为:()40a -km/h”是解本题的关键.24.(1)78;(2)715【解析】【分析】(1)运用题干中的裂项变形法计算即可;(2)仿照题目规律可得111=11323⎛⎫⨯- ⎪⨯⎝⎭,按照此方法裂项计算即可.【详解】(1)1111111261220304256++++++1111111111111=12233445566778-+-+-+-+-+-+-1=18-7=8(2)11111111335577991111131315++++++⨯⨯⨯⨯⨯⨯⨯11111111111111=12335577991111131315⎛⎫-+-+-+-+-+- ⎪⎝⎭11=1215⎛⎫- ⎪⎝⎭7=15【点睛】本题考查了有理数的运算,解题的关键是找到规律,运用裂项求和的方法.25.(1)2x +的零点值为-2, 4x -的零点值是4.(2)当2x <-时,原式22x =-+;当-2≤x≤4,原式6=;当4x >时,原式22x =-.【解析】【分析】(1)根据题中所给材料,求出零点值;(2)将全体实数分成不重复且不遗漏的三种情况解答;解:(1)令20x +=,解得2x =-,所以2x +的零点值为-2,令40x -=,解得4x =,所以4x -的零点值是4.(2)当2x <-时,原式()()242422x x x x x =-+--=---+=-+;当-2≤x≤4,原式()()24246x x x x =+--=+-+=;当4x >时,原式()()2422x x x =++-=-.综上所述:22(2)246(24)22(4)x x x x x x x -+<-⎧⎪++-=-≤≤⎨⎪->⎩。

七年级下学期期中考试(语文)试题含答案

七年级下学期期中考试(语文)试题含答案

七年级下学期期中考试(语文)(考试总分:120 分)一、选择题(本题共计3小题,总分6分)1.(2分)下列各组加点词语中注音准确无误的一项是( )A.澎湃.(pài) 祈祷.(dǎo) 亘.古(gènɡ) 锲.而不舍(qiè)B.校.对(jiào) 默契.(qì) 晌.午(shǎng) 气冲斗.牛(dòu)C.嫉.妒(jì) 哺.育(bǔ) 挚.友(zhì) 鞠躬尽瘁.(cuì)D.愧怍.(zuò) 污秽.(huì) 殷.红(yān) 扑朔.迷离(shuò)2.(2分)下列词语中没有错别字的一项是( )A.草率抱歉取谛心不在焉熟能生巧B.斑斓奠基厚道大庭广众家喻户晓C.胸膛烦锁卓越妇孺皆知言外之意D.惶恐懊悔诧异群蚁排衙深恶痛决3.(2分)下列句子顺序排列最恰当的一项是( )①竹。

柔韧清秀,刚健挺拔,最宜入诗入画。

①竹如谦谦君子,它有兰的优雅,松的高洁,深受古代文人的青睐。

①那成片的竹林,风过如丝弦裂帛,雨来如琴瑟和鸣,那就是一首抒情诗,一幅水墨画。

①“虚心有致,高风亮节”是文人雅士对竹的评价:“咬定青山不放松,立根原在破岩中,千磨万击还坚劲,任尔东西南北风"则是活脱脱的人格写照了。

①郑板桥一生爱竹,自有个中缘由;苏东坡“宁可食无肉,不可居无竹”也不仅仅是情趣使然。

A.①①①①①B.①①①①①C.①①①①①D.①①①①①二、默写(本题共计1小题,总分4分)4.(4分)古诗文默写。

(1).深林人不知,__________(王维《竹里馆》)(2).__________,惟解漫天作雪飞。

(韩愈《晚春》)(3).《逢人京使》中颇带夸张意味,强调思家深情的句子是:__________,__________。

(4).《木兰诗》中表现木兰出征前紧张繁忙、周密有序的准备情形的儿句是:__________,__________.三、名著阅读(本题共计1小题,总分4分)5.(4分)名著阅读。

江苏省无锡市天一中学2023-2024学年高一上学期期中考试数学试题

江苏省无锡市天一中学2023-2024学年高一上学期期中考试数学试题

D.若 a - b Î[0] ,则整数 a , b 属同一类
四、多选题
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试卷第51 页,共33 页
1.C 【分析】利用交集的定义即可求解.
参考答案:
【详解】由题意可知, A Ç B = {x -1 £ x < 3} Ç{0,1, 2,3} = {0,1, 2} .
故选:C. 2.A 【分析】写出该命题的否定即可.
【详解】“ "x Î Z , x2 + 2x + m £ 0 ”的否定是“ $x Î Z , x2 + 2x + m > 0 ”. 故选:A 3.B 【解析】利用函数奇偶性的定义和单调性的性质分别对各个选项分析判断即可.

初中期中考试试题及答案

初中期中考试试题及答案

初中期中考试试题及答案一、选择题(每题2分,共20分)1. 下列哪个选项是正确的?A. 地球是平的B. 地球是宇宙的中心C. 地球是圆的D. 地球是太阳系的中心答案:C2. 以下哪个国家不是联合国的创始会员国?A. 中国B. 法国C. 印度D. 巴西答案:C3. 以下哪个选项是光的折射现象?A. 镜子反射B. 透镜成像C. 影子形成D. 光的直线传播答案:B4. 以下哪个选项是植物的六大器官之一?A. 根B. 茎C. 叶D. 所有选项答案:D5. 以下哪个选项是正确的化学方程式?A. 2H2 + O2 → 2H2OB. 2H2 + O2 → H2OC. H2 + O2 → H2OD. H2 + O2 → 2H2O答案:A6. 以下哪个选项是正确的数学公式?A. (a + b)^2 = a^2 + 2ab + b^2B. (a + b)^2 = a^2 + b^2C. (a - b)^2 = a^2 - 2ab + b^2D. (a - b)^2 = a^2 + 2ab + b^2答案:A7. 以下哪个选项是正确的历史事件?A. 秦始皇统一六国B. 秦始皇统一七国C. 汉武帝统一六国D. 汉武帝统一七国答案:A8. 以下哪个选项是正确的物理定律?A. 牛顿第一定律B. 牛顿第二定律C. 牛顿第三定律D. 所有选项答案:D9. 以下哪个选项是正确的生物分类单位?A. 门B. 纲C. 目D. 所有选项答案:D10. 以下哪个选项是正确的地理概念?A. 经度B. 纬度C. 经纬度D. 所有选项答案:D二、填空题(每题2分,共20分)1. 地球的自转周期是________小时。

答案:242. 联合国的总部设在________。

答案:纽约3. 光的折射现象可以通过________来观察。

答案:水中的筷子4. 植物的六大器官包括根、茎、叶、花、果实和________。

答案:种子5. 化学方程式中,反应物和生成物的________必须相等。

语文期中试题一年级(精选8篇)

语文期中试题一年级(精选8篇)

语文期中试题一年级(精选8篇)语文期中试题一年级第1篇一、看拼音,写词语。

(30分)chūn yǔɡōnɡ kè huí dá yǐ hu hǎi yánɡbiāo qiānɡ jì yì cān jiā liàn xí mù mín chī fàn xiū xi chí tánɡ jìng zǒu yǎnɡ xiā一、给下面的字加上偏旁组成新字,再组词。

(6分)也_____兆_____皮____________________三、选字或词填空。

(10分)牙芽1.春天到了,柳树发()了。

2.小朋友要保护()齿(chǐ)。

在再1.我没听清楚,请你()说一遍,好吗?2.星期天,小红()家里练字。

一束一片一声一口一位一块1.()春雷,唤醒了春笋。

4.()画家在公园里画画。

2.小山村里有()井。

5.树上掉下来()树叶。

3.小姑娘送给骑手()鲜花。

6.马路边有()大石头。

四、比一比,再组词。

(8分)特()观()指()次()牧()欢()抬()吹()五、连一连。

(8分)雪白的春天消防车不知义粉红的梨花玉不琢灭火彩色的外衣洒水车不成器浅褐色的桃花人不学给道路洒水六、把下面的句子补充完整,别忘记加标点哦。

(6分)1.你喜欢________________________吗2.________在池塘里3.一边一边七、填空。

(23分)1.我喜爱的体育运动有_________、_________、_________。

(3分)2.青蜡笔,画,蜡笔,画小燕。

要我们,画我祖国。

(5分)3.有马能,,有土能种庄稼。

有人,有水能。

(5分)4、 ()()()()()涌出了圈门,蹦跳着奔向()()()()()。

(5分)5.()()倒映在池塘里,像一群白鹅。

()()倒映在池塘里,像一只鲜红的气球。

期中考试试题

期中考试试题

八年级语文试题班级:_________ 姓名:__________ 得分:_____________一、积累和运用(14分,每小题2分)1、下列加点字注音完全正确的一项是( )A.畸.形(qí) 诘.责(jié) 油光可鉴.(jiàn)B.匿.名(nì) 不逊.(xùn) 深恶.痛疾(è)C.解剖.( pōu) 教诲.(huǐ) 抑.扬顿挫(yì)D.绯.红(fēi) 凄.然(qī) 杳.无音讯(yǎo)2、下列句中加点词的感情色彩发生变化的一项是( )A.她们闹气时,只是不说话,不答话,把脸放下来,叫人难看..。

B.我小时身体弱,不能跟着野蛮..的孩子们一块儿玩。

C.小时不曾养成活泼游戏的习惯,无论在什么地方,我总是文绉绉...的。

D.但她有时候也很有刚气..,不受一点人格上的侮辱。

3、下面句子中没有语病的一项是( )A.海峡两岸“三通”的正式启动,标志着两岸关系取得了历史性重大突破。

B.我们应该防止类似“三鹿奶粉事件”的情况不再发生。

C.减轻学生过重的课业负担,是目前中小学教学工作的当务之急。

D.中国加入世界贸易组织,虽然给我们带来了发展的机遇,而且使我们面临严峻的挑战。

4、古代诗文中常用典故,下列语句中不含典故的一项是()A.怀旧空吟闻笛赋,到乡翻似烂柯人。

B.东风不与周郎便,铜雀春深锁二乔。

C.其真无马邪?其真不知马也。

D.无怀氏之民欤?葛天氏之民欤?5、下列句子中没有通假字的一项是()A.蝉则千转不穷,猿则百叫无绝。

B.造饮辄尽,期在必醉,曾不吝情去留。

C.食不饱,力不足,才美不外见。

D.同舍生皆被绮绣,戴朱缨宝饰之帽,腰白玉之环。

6、下列词语中有四个错别字,请把正确的写在下面的方框里。

粗制烂造正经危坐诚皇诚恐鹤立鸡群无可臵疑郁郁寡欢引人注目藏污纳沟二、古诗背诵默写(8分,每空1分)1、《酬乐天杨州初逢席上见赠》中蕴含人生哲理,给人以鼓舞的句子是________________,____________________。

人教版九年级上册数学期中考试试卷附答案

人教版九年级上册数学期中考试试卷附答案

人教版九年级上册数学期中考试试题2022年7月一、单选题1.下面的图形中,既是轴对称图形又是中心对称图形的是()A .B .C .D .2.方程22x x =的解是()A .2x =B .122,0x x ==C .0x =D .122,1x x ==3.二次函数y =(x+1)2+2的图象的顶点坐标是()A .(﹣2,3)B .(﹣1,2)C .(1,2)D .(0,3)4.在平面直角坐标系中,点A 的坐标是(1,3),将点A 绕原点O 顺时针旋转180°得到点A′的坐标是()A .(﹣1,3)B .(1,﹣3)C .(3,1)D .(-1,﹣3)5.把二次函数2y x =-的图象向左平移1个单位,然后向上平移3个单位,则平移后的图象对应的二次函数的关系式为()A .2(1)3y x =-++B .2(1)3y x =-+-C .2(1)3y x =---D .2(1)3y x =--+6.如图,DE BC ,在下列比例式中,不能成立的是()A .AD AEDB EC=B .DE AEBC EC=C .AB ACAD AE=D .DB ABEC AC=7.在某一时刻,测得一根高为1.8m 的竹竿的影长为3m ,同时测得一根旗杆的影长为25m ,那么这根旗杆的高度为()A .10mB .12mC .15mD .40m8.一种药品原价每盒25元,经过两次降价后每盒16元设两次降价的百分率都为x ,则x 满足()A .16(12)25x +=B .25(12)16x -=C .216(1)25x +=D .225(1)16x -=9.已知二次函数y =x 2﹣6x+1,关于该函数在﹣1≤x≤4的取值范围内,下列说法正确的是()A .有最大值8,最小值﹣8B .有最大值8,最小值﹣7C .有最大值﹣7,最小值﹣8D .有最大值1,最小值﹣710.如图,在Rt ABC 中,90ACB ∠=︒,30ABC ∠=︒,将ABC 绕点C 顺时针旋转α角0180()α︒<<︒至A B C ''△,使得点A '恰好落在AB 边上,则α等于()A .150︒B .90︒C .30°D .60︒二、填空题11.若两个相似三角形的相似比是1:2,则它们的面积比是______.12.已知方程x 2﹣3x ﹣k =0有一根是2,则k 的值是_____.13.如图,已知30EAD =∠°,ADE 绕着点A 逆时针旋转50°后能与ABC 重合,则BAE ∠=_____°.14.《九章算术》勾股章有一问题,其意思是:现有一竖立着的木柱,在木柱上端系有绳索,绳索从木柱上端顺木柱下垂后,堆在地面的部分尚有3尺,牵着绳索退行,在离木柱根部8尺处时绳索用尽,请问绳索有多长?若设绳索长度为x 尺,根据题意,可列方程为_____.15.若二次函数21y ax =+,当x 取1x ,2x (12x x ≠)时,函数值相等,则当x 取12x x +时,函数值为_____.16.如图,在正方形ABCD 中,4AB =,P 是BC 边上一动点(不与B ,C 重合),DE AP ⊥于E .若PA x =,DE y =,则y 关于x 的函数解析式为_____.三、解答题17.解方程:2420x x ++=.18.已知抛物线23y ax bx =++经过点()3,0-,()2,5-.求此抛物线的解析式.19.如图,在ABC 中,90ACB ∠=︒,AC BC =,D 是AB 边上一点(点D 与A ,B 不重合),连结CD ,将线段CD 绕点C 按逆时针方向旋转90°得到线段CE ,连结BE .求证:AD BE =.20.如图,方格纸中每个小正方形的边长均为1个单位长度,小正方形的顶点成为格点.Rt ABC 的三个顶点()2,2A -、()0,5B 、()0,2C .(1)将ABC 以点C 为旋转中心旋转180°,得到11A B C ,画出11A B C ,并直接写出点1A 、1B 的坐标;(2)平移ABC ,使点A 的对应点为()22,6A --,请画出平移后对应的222A B C △;(3)若将11A B C 绕某一点旋转可得到222A B C △,请直接写出旋转中心的坐标.21.某中学课外兴趣活动小组准备围建一个矩形苗圃园,其中一边靠墙,另外三边由长为30米的篱笆围成.已知墙长为18米(如图所示),若苗圃园的面积为72平方米.求这个苗圃园垂直于墙的一边长为多少米?22.如图1,ABC 与ADE 中,90ACB AED ∠=∠=︒,连接BD 、CE ,EAC DAB ∠=∠.(1)求证:BAD CAE ∽;(2)已知4BC =,3AC =,32AE =.将AED 绕点A 旋转,当C 、E 、D 三点共线时,如图2,求BD 的长.23.某超市销售一种商品,成本每千克40元,规定每千克售价不低于成本,且不高于80元,经市场调查,每天的销售量y (千克)与每千克售价x (元)满足一次函数关系,部分数据如下表:售价x (元/千克)506070销售量y (千克)1008060(1)求y 与x 之间的函数表达式;(2)设商品每天的总利润为W (元),则当售价x 定为多少元时,厂商每天能获得最大利润?最大利润是多少?(3)如果超市要获得每天不低于1350元的利润,且符合超市自己的规定,那么该商品每千克售价的取值范围是多少?请说明理由.24.如图,在Rt ABC 中,90ACB ∠=︒,8AC =,4BC =,动点D 从点B 出发,以每秒1个单位长度的速度沿BA 向点A 运动,到达点A 停止运动,过点D 作ED AB ⊥交射线BC 于点E ,以BD 、BE 为邻边作平行四边形BDFE .设点D 运动时间为t 秒,平行四边形BDFE 与Rt ABC 的重叠部分面积为S .(1)当点F 落在AC 边上时,求t 的值;(2)求S 关于t 的函数解析式,并直接写出自变量t 的取值范围.25.定义:若两条抛物线的对称轴相同,则称这两条抛物线为同轴抛物线.若抛物线211:12C y x mx m =--+与抛物线2C :2222y x nx n =-++-为同轴抛物线,将抛物线1C 上1≥x 的部分与抛物线2C 上1x <的部分合起来记作图象G .(1)①n =_____(用含m 的式子表示);②若点(),1m -在图象G 上,求m 的值;(2)若1m =,当12x -≤≤时,求图象G 所对应的函数值y 的取值范围;(3)正方形ABCD 的中心为原点O ,点A 的坐标为()1,1,当图象G 与正方形ABCD 有3个交点时,求m 的取值范围(直接写出结果).26.在△ABC 中,点D 在BC 边上,AD CD =,点E 、F 分别在线段AC 、AD 上,连结EF ,且EFD ABC ∠=∠.(1)当点E 与点C 重合时,如图1,找出图中与EF 相等的线段,并证明;(2)当点E 不与点C 重合时,如图2,若AC kEC =,求EFAB的值(用含k 的式表示);(3)若90BAC ∠=︒,35AB BC =,23EF AB =,如图3,求EC AC 的值.参考答案1.C 【分析】根据轴对称图形与中心对称图形的概念求解.【详解】解:A 、是轴对称图形,不是中心对称图形,故此选项不合题意;B 、不是轴对称图形,是中心对称图形,故此选项不合题意;C 、既是轴对称图形又是中心对称图形,故此选项符合题意;D 、是轴对称图形,不是中心对称图形,故此选项不合题意;故选:C .2.B 【解析】利用因式分解法解一元二次方程,提取公因式x .【详解】解:22x x=()20x x -=,10x =,22x=.故选:B .3.B 【解析】根据顶点式的意义直接解答即可.【详解】解:二次函数y =(x+1)2+2的图象的顶点坐标是(﹣1,2).故选:B .4.D 【解析】根据中心对称的定义得到点A 与点A′关于原点对称,然后根据关于原点对称的点的坐标特征求解.【详解】∵线段OA 绕原点O 顺时针旋转180°,得到OA′,∴点A 与点A′关于原点对称,而点A 的坐标为(1,3),∴点A′的坐标为(﹣1,﹣3).故选D .5.A 【解析】根据二次函数图象的平移规律解答即可.【详解】解:由题意知,平移后抛物线的解析式是()213y x =-++,故A 正确.故选:A .【点睛】本题考查了二次函数图象的平移,解题的关键在于掌握二次函数图象平移的规律:左加右减,上加下减.6.B 【解析】平行线分线段成比例定理:两条直线被一组平行直线所截,所得的对应线段的长度成比例.【详解】DE BC ∥,AD AE DB ABDB EC EC AC∴==.ADE ABC ∴ ∽DE AE AEBC AC EC∴=≠B.错误故选B .【点睛】平行线分线段成比例定理:两条直线被一组平行直线所截,所得的对应线段的长度成比例.7.C 【解析】根据同时同地物高与影长成正比,列式计算即可得解.【详解】设旗杆高度为x 米,由题意得,1.8325x,解得:x=15,故选C.【点睛】本题考查了相似三角形的应用,熟知同时同地物高与影长成比例是解题的关键.8.D【解析】等量关系为:原价×(1-降价的百分率)2=现价,把相关数值代入即可.【详解】第一次降价后的价格为:25×(1-x);第二次降价后的价格为:25×(1-x)2;∵两次降价后的价格为16元,∴25(1-x)2=16.故选:D.9.A【解析】把函数解析式整理成顶点式解析式的形式,然后根据二次函数的最值问题解答.【详解】∵y=x2﹣6x+1=(x﹣3)2﹣8,∴在﹣1≤x≤4的取值范围内,当x=3时,有最小值﹣8,当x=﹣1时,有最大值为y=16﹣8=8.故选A.【点睛】本题考查了二次函数的最值问题,把函数解析式转化为顶点式形式是解题的关键.10.D【解析】【分析】由旋转的性质可得CA=CA',∠ACA'=α,由等腰三角形的性质可得∠A=∠CA'A=60°,由三角形内角和定理可求α的值.【详解】解:90ACB ∠=︒ ,30ABC ∠=︒,60A ∴∠=︒,将ABC ∆绕点C 顺时针旋转α角0180()α︒<<︒至△A B C '',CA CA '∴=,ACA α'∠=,60A CA A '∴∠=∠=︒,60ACA ∴'∠=︒,60α∴=︒,故选:D .【点睛】本题考查了旋转的性质,等腰三角形的性质,掌握旋转的性质是本题的关键.11.1:4【解析】【分析】根据相似三角形的面积比等于相似比即可求得.【详解】∵两相似三角形的相似比为1:2,∴它们的面积比是1:4,故答案为:1:4.【点睛】本题考查了相似三角形的面积的比等于相似比的平方的性质,熟记性质是解题的关键.12.-2【解析】【分析】直接把x =2代入方程x 2﹣3x ﹣k =0,得到关于k 的方程,然后解一次方程即可.【详解】解:把x =2代入方程x 2﹣3x ﹣k =0得4﹣6﹣k =0,解得k =﹣2.故答案为﹣2.【点睛】本题考查了一元二次方程的解:能使一元二次方程左右两边相等的未知数的值是一元二次方程的解.13.20【解析】【分析】利用旋转的性质得出50DAB ∠=o ,进而得出BAE ∠的度数.【详解】∵30EAD =∠°,ADE 绕着点A 逆时针旋转50°后能与ABC 重合,∴50DAB ∠=o ,则BAE ∠=503020DAB DAE ∠-∠=-=o o o 故答案为:20°【点睛】此题主要考查了旋转的性质,得出旋转角DAB ∠的度数是解题关键.14.()22238x x -+=【解析】【分析】根据题意可直接进行列式求解.【详解】由题意易得:()22238x x -+=;故答案为()22238x x -+=.【点睛】本题主要考查勾股定理的应用,熟练掌握勾股定理的应用是解题的关键.15.1【解析】【分析】y=ax 2+1的对称轴是y 轴,当x 取x 1,x 2(x 1≠x 2)时,函数值相等,所以x 1,x 2互为相反数,即x 1+x 2=0,由此可以确定此时函数值.【详解】解:∵在y=ax 2+c 的对称轴是y 轴,当x 取x 1,x 2(x 1≠x 2)时,函数值相等,∴x 1,x 2互为相反数,∴x 1+x 2=0,∴y=0+1=1.故答案为:1.【点睛】本题考查了二次函数图象上点的坐标特征,主要利用了二次函数的对称性.16.(164y x x=<<【解析】【分析】根据正方形的性质以及DE ⊥AP 即可判定△ADE ∽△PAB ,根据相似三角形的性质即可列出y 与x 之间的关系式,需要注意的是x 的范围.【详解】解:∵四边形ABCD 为正方形,∴∠BAD =∠ABC =90°,∴∠EAD+∠BAP =90°,∠BAP+∠APB =90°,∴∠EAD =∠APB ,又∵DE ⊥AP ,∠AED =∠B =90°,∴△ADE ∽△PAB .∴=AD DEAP AB,即4=4y x∴(164y x x=<<.故答案为:(164y x x=<<【点睛】本题考查相似三角形,解题关键是熟练运用相似三角形的判定与性质,本题属于中等题型.17.12x =-+22x =--【解析】【分析】方程利用配方法求出解即可.∵2420x x ++=,∴242x x +=-,∴24424x x ++=-+,∴()222x +=,∴2x =-∴12x =-22x =--18.223y x x =--+.【解析】将点()3,0-,()2,5-代入抛物线23y ax bx =++解方程组求出b 、c 的值即可得答案.【详解】由题意得,93304235a b a b -+=⎧⎨++=-⎩解得,12a b =-⎧⎨=-⎩,则二次函数的解析式为223y x x =--+.19.见解析.【解析】由旋转的性质可得CD =CE ,∠DCE =90°,由“SAS”可证△ACD ≌△BCE ,从而得出结论.【详解】∵将线段CD 绕点C 按逆时针方向旋转90°得到线段CE ,∴CD CE =,90DCE ∠=︒,∴90DCE ACB ∠=∠=︒,∴ACD DCB DCB BCE ∠+∠=∠+∠,∴ACD BCE ∠=∠,且AC BC =,CD CE =,∴()ACD BCE SAS ≌,∴AD BE =.20.(1)图见解析,()12,2A ,()10,1B -;(2)图见解析;(3)(0,2)-.(1)先根据旋转的性质画出点11,A B ,再顺次连接点11,,A B C 即可得,然后根据点C 是11,A A B B 的中点即可求出点11,A B 的坐标;(2)先根据点2,A A 的坐标得出平移方式,再根据点坐标的平移变换规律可得点22,B C 的坐标,然后画出点222,,A B C ,最后顺次连接点222,,A B C 即可得;(3)先根据旋转中心的定义可得线段12B B 的中点P 即为旋转中心,再根据点12,B B 的坐标即可得.【详解】(1)先根据旋转的性质画出点11,A B ,再顺次连接点11,,A B C 即可得11A B C ,如图所示:设点1A 的坐标为1(,)A a b ,点C 是1A A 的中点,且()2,2A -,()0,2C ,202222ab -+⎧=⎪⎪∴⎨+⎪=⎪⎩,解得22a b =⎧⎨=⎩,1(2,2)A ∴,同理可得:1(0,1)B -;(2)()()2,62,2,2A A --- ,∴从点A 到点2A 的平移方式为向下平移8个单位长度,()()0,5,0,2B C ,()()220,58,0,28B C ∴--,即()()220,3,0,6B C --,先画出点222,,A B C ,再顺次连接点222,,A B C 即可得222A B C △,如图所示:(3)由旋转中心的定义得:线段12B B 的中点P 即为旋转中心,()12(0,1),0,3B B -- ,0013(,)22P +--∴,即(0,2)P -,故旋转中心的坐标为(0,2)-.21.这个苗圃园垂直于墙的一边长为12米.【解析】设这个苗圃园垂直于墙的一边长为x 米,利用长方形面积公式列方程求解,再根据靠墙边的长度范围确定取值即可.【详解】设这个苗圃园垂直于墙的一边长为x 米,根据题意得:()30272x x -=解得:13x =,212x =,∵30218x -≤,∴6x ≥,∴12x =.答:这个苗圃园垂直于墙的一边长为12米.22.(1)见解析;(2)BD =【解析】(1)由已知可得CAB EAD ∠=∠,则A ABC DE ∽△△,可得AC AEAB AD=,结合EAC BAD ∠=∠,则结论得证;(2)由A ABC DE ∽△△,求出AB 、AD 的长,再结合BAD CAE ∽可得90AEC ADB ∠=∠=︒,则BD 可求.【详解】(1)证明:∵EAC DAB ∠=∠,∴CAB EAD ∠=∠.∵90ACB AED ∠=∠=︒,∴A ABC DE ∽△△.∴AC AEAB AD=.∵EAC BAD ∠=∠,∴BAD CAE ∽.(2)∵90ACB ∠=︒,4BC =,3AC =,∴5AB ==.∵A ABC DE ∽△△,∴AC ABAE AD=.∴52AB AE AD AC ⋅==.将AED 绕点A 旋转,当C 、E 、D 三点共线时,90AEC ∠=︒,∵BAD CAE ∽,∴90AEC ADB ∠=∠=︒.∴BD =23.(1)y =﹣2x+200(40≤x≤80);(2)售价为70元时获得最大利润,最大利润是1800元;(3)55≤x≤80,理由见解析【解析】(1)待定系数法求解可得;(2)根据“总利润=每千克利润×销售量”可得函数解析式,将其配方成顶点式即可得最值情况.(3)求得W =1350时x 的值,再根据二次函数的性质求得W≥1350时x 的取值范围,继而根据“每千克售价不低于成本且不高于80元”得出答案.【详解】(1)设y =kx+b ,将(50,100)、(60,80)代入,得:501006080k b k b +=⎧⎨+=⎩,解得:k 2b 200=-⎧⎨=⎩,∴y =﹣2x+200(40≤x≤80);(2)W =(x ﹣40)(﹣2x+200)=﹣2x 2+280x ﹣8000=﹣2(x ﹣70)2+1800,∴当x =70时,W 取得最大值为1800,答:售价为70元时获得最大利润,最大利润是1800元.(3)当W =1350时,得:﹣2x 2+280x ﹣8000=1350,解得:x =55或x =85,∵该抛物线的开口向下,所以当55≤x≤85时,W≥1350,又∵每千克售价不低于成本,且不高于80元,即40≤x≤80,∴该商品每千克售价的取值范围是55≤x≤80.24.(1(2)22220326416553515t t S t t t t t ⎧⎛<≤⎪ ⎪ ⎪⎪⎝⎭⎪⎛⎪=-+-≤≤ ⎪⎨ ⎪⎝⎭⎪⎪⎪-+≤⎪⎝⎩.【解析】(1)根据勾股定理求得AB =,易证BED BAC ∽△△,根据相似三角形的性质求得BE =,根据平行四边形的性质可得DF BE ∥即DF =,继而易得 ∽ADF ABC ,继而根据相似三角形的性质求解;(2)分①当03t <≤时,②当03t <≤时,③当5t <≤【详解】(1)当点F 落在AC 边上时,如图1∵在Rt ABC 中,8AC =,4BC =,90ACB ∠=︒,∴AB =∵ED AB ⊥于D ,∴90EDB ACB ∠=∠=︒,B B ∠=∠,∴BED BAC ∽△△,∴BD BEBC AB=,∴4t =BE =,∵四边形BDFE 为平行四边形,∴DF ∥,∴DF , ∽ADF ABC ,∴DF AD BC AB =,即4=3t =∴当点F 落在AC 边上时,t(2)当0t <≤2,∵BDE BCA ∽,∴BD DE BC CA=,∴48t DE=,∴2DE t =.∴222BDFE S S BD DE t t t ==⋅=⋅= ;当点E 与点C 4=,5t =,t <≤3,∵DM BC ,∴ADM ABC △∽△,∴DM ADBC AB =,∴4DM =∴4DM =-.∵DF BE ==,∴44MF ⎛⎫=-=- ⎪ ⎪⎝⎭又∵MNF CAB △∽△,∴MN MF CA CB =,∴84MN MF=,∴2MN MF =.∴2221364162555MNFS MN MF MF t t t ⎛⎫=⋅==-=-+ ⎪ ⎪⎝⎭△∴22362165BDFE MNF S S S t t ⎛⎫=-=-+ ⎪ ⎪⎝⎭△∴2264851655S t t =-+-;当45455t <≤时,如图4.∵ADM ABC △∽△,∴AD DM AMAB BC AC==,∴454845t DM AM -==,∴545DM t =-,2585AM t =-.∴25258855MC t t ⎛⎫=--= ⎪ ⎪⎝⎭.∵BDMC S S =梯形.∴215251854425555S t t t t ⎛⎫=⋅-+⨯=-+ ⎪ ⎪⎝⎭.综上所述,222252032648525451655351854545555t t S t t t t t t ⎧⎛⎫<≤⎪ ⎪ ⎪⎪⎝⎭⎪⎛⎫⎪=-+-≤≤ ⎪⎨ ⎪⎝⎭⎪⎪⎛⎫⎪-+<≤ ⎪ ⎪⎪⎝⎭⎩.25.(1)①m ;②m 的取值为15-+或12-+12-;(2)当12x -≤≤时,图象G 所对应的函数值y 的取值范围为31y -≤<;(3)1122m -<<或514m <≤.【解析】(1)①根据同轴抛物线的定义可得n=m ;②分两种情况:①当m 1≥时,将(),1m -代入2112y x mx m =-=+中,当1m <时,把(),1m -代入2222y x mx m =-++-中,计算可解答;(2)先将m=1代入函数y 中,画出函数图象,分别代入x=-1,x=2,x=1计算对应的函数y 的值,根据图象可得结论;(3)画出相关函数的图象,根据图象即可求得.【详解】(1)①抛物线1C 的对称轴为:1x m =,抛物线2C 的对称轴为:2x n =,∵1C 与2C 为同轴抛物线,∴12x x =∴n m =故答案为:m②当m 1≥时,将(),1m -代入2112y x mx m =-=+中得221112m m m --+=-,2240m m +-=,解得11m =-21m =-,∵m 1≥,∴1m =-当1m <时,把(),1m -代入2222y x mx m =-++-中得:222221m m m -++-=-,2210m m +-=解得11m =-+21m =-∵1m <,∴1m =-1m =-.综上所述,m的取值为1-或1-+1--(2)当1m =时,图象G 的函数解析式为()()2211221x x x y x x x ⎧-≥⎪=⎨⎪-+<⎩,图象G 如图1所示,在抛物1C 上,当12x ≤≤时,y 随x 的增大而增大,102y -≤≤,在抛物线2C 上,当11x -≤<时,y 随x 的增大而增大,31y -≤<∴当12x -≤≤时,图象G 所对应的函数值y 的取值范围为31y -≤<;(3)当112m -<<或514m <≤时,图象G 与正方形ABCD 有3个交点,抛物线()2222:22222C y x mx m x m m m =-++-=--++-.抛物线211:12C y x mx m =--+,当1x =时,322y m =-当31212m -≤-≤时,1544m ≤≤.当抛物线2C 的顶点在BC 上时,如图2,2221m m +-=-,11m =-,21m =-当抛物线2C 过点()1,1B -时,如图3,12221m m -++-=-,12m =,∴112m -<<;当抛物线2C 过点()1,1A 时,如图4,12221m m -++-=,44m =,1m =.当抛物线1C 过点()1,1B -时,如图5,1112m m --+=-,54m =,∴514m <≤.综上所述,当112m -+<或514m <≤时,图象G 与正方形ABCD 有3个交点.26.(1)EF AB =.证明见解析;(2)1EF k AB k-=;(3)13EC AC =.【解析】(1)在BD 上取点M ,使AM AD =,根据等边对等角的性质、等量代换及全等三角形的判定和性质可得AB EF =;(2)在BD 上取点M ,使AM AD =,过E 作EN CD 交AD 于N ,根据等边对等角、平行线的性质、等量代换可证得:ENF AMB △∽△,继而可得EF EN AB AM =,继而易证ANE ADC △∽△,CN DC E AE A =,继而即可求解;(3)过E 作EG AD ⊥于G ,易证EGF CAB △∽△,可得EG EF AC BC =,可设3AB a =,5BC a =,则4AC a =,求得2EF a =,85EG a =,易证AGE CAB △∽△,进而可得AE GE CB AB=,继而可知83AE a =,84433EC a a a =-=,继而即可求解.【详解】(1)EF AB =.证明:在BD 上取点M ,使AM AD =,如图1,∵AM AD =,∴AMD ADM ∠=∠,∴AMB ADC ∠=∠,又∵AD CD =,∴AM CD =,又∵ABC EFD ∠=∠.∴()ABM CFD AAS △≌△,∴AB EF =;(2)解:在BD 上取点M ,使AM AD =,过E 作EN CD 交AD 于N.∵AM AD =,∴AMD ADM ∠=∠,∴AMB ADC ∠=∠.∵NE DC ∥,∴FNE ADC AMB ∠=∠=∠.又∵EFD ABC ∠=∠,∴ENF AMB △∽△,∴EFENAB AM =,∵EN DC ,∴ANE ADC △∽△,∴CN DC E AEA =∵AC kEC =,∴()1AE AC EC k EC =-=-.∴()11k EC EN kDC kEC k --==,∵AM AD DC ==,∴1EN EN k DC AM k -==,∴1EF k AB k -=;(3)解:过E 作EG AD ⊥于G ,如图3∵90BAC ∠=︒,∴EGF BAC ∠=∠.又∵EFD ABC ∠=∠,∴EGF CAB △∽△,∴EG EFAC BC=∵35ABBC =,∴设3AB a =,5BC a =,则4AC a =,又∵23EFAB =,∴2EF a =,∴245EG a a a =,∴85EG a =.又∵AD DC =,∴DAC C ∠=∠,∴AGE CAB △∽△,∴AEGECB AB =,∴8553a AE a a =,∴83AE a =∵4AC a =,∴84433EC a a a =-=,∴41343a EC AC a ==.【点睛】本题主要考查相似三角形的的判定及其性质,涉及到等边对等角的性质、等量代换及全等三角形的判定及其性质,解题的关键是熟练掌握所学知识.。

初一考试题期中及答案

初一考试题期中及答案

初一考试题期中及答案一、选择题(每题2分,共20分)1. 下列哪个是正确的数学表达式?A. 2 + 3 = 5B. 3 × 4 = 12C. 4 ÷ 2 = 6D. 5 - 1 = 42. 以下哪个选项是英语中“苹果”的正确拼写?A. appleB. apelC. apploD. aple3. 地球绕太阳转一圈的周期是多久?A. 24小时B. 30天C. 1年D. 365天4. 以下哪个不是中国四大发明之一?A. 造纸术B. 印刷术C. 火药D. 望远镜5. 以下哪个选项是正确的物理公式?A. 速度 = 距离 / 时间B. 速度 = 距离× 时间C. 速度 = 距离 + 时间D. 速度 = 距离 - 时间二、填空题(每题2分,共20分)6. 一个数的平方根是4,这个数是_________。

7. 英语中“我很高兴”可以翻译为_________。

8. 地球的自转周期是_________。

9. 化学中,水的化学式为_________。

10. 牛顿第二定律的表达式为_________。

三、简答题(每题10分,共30分)11. 请简述光合作用的过程。

12. 请解释什么是电流,并说明其单位。

四、计算题(每题15分,共30分)13. 一个长方体的长、宽、高分别是5厘米、4厘米、3厘米,请计算其体积。

14. 一个物体以10米/秒的速度运动,经过5秒后,求其位移。

答案:一、选择题1. A2. A3. C4. D5. A二、填空题6. 167. I am very happy.8. 24小时9. H2O10. F = ma三、简答题11. 光合作用是植物通过叶绿体,利用光能将二氧化碳和水转化为有机物,并释放氧气的过程。

12. 电流是电荷的流动,其单位是安培(A)。

四、计算题13. 体积 = 长× 宽× 高= 5 × 4 × 3 = 60立方厘米14. 位移 = 速度× 时间= 10 × 5 = 50米结束语:本次期中考试试题涵盖了数学、英语、科学等多个学科,旨在全面检测学生的综合能力。

七年级历史上册期中考试试卷

七年级历史上册期中考试试卷

七年级历史上册期中考试试题一、单项选择题(共25小题,每小题2分,共50分。

)1.某同学在阅读一本有关我国境内远古居民生活情况的历史书时,了解到有一群距今约三万年的远古人,模样与现代人基本相同,已掌握磨光和钻孔技术,并已会人工取火。

你认为这群远古人应是A. 元谋人B. 蓝田人C. 北京人D. 山顶洞人2.韩非子在描述远古社会自然环境时,写道:“上古之世,人民少而禽兽众(多),人民不胜(承受不住)禽兽虫蛇(的迫害)”,这种情况决定了远古居民最恰当的选择是A.学会制造工具,抵御野兽B.过群居生活,共同生存C.懂得用天然火,追逐野兽D.住在山洞里,躲避虫蛇3.农耕文明与游牧文明是中华民族古代的两种不同文明,存在着互补性。

农耕文明起源于母系氏族繁荣期,是指以农耕生产为主的一切物质财富与精神财富的总和。

能够种植粟、烧制彩陶、住半地穴式房屋、居住在黄河流域的我国原始农耕居民是A.郧县人B.北京人C.半坡人D. 河姆渡4.历史课堂上,老师在讲解我国一处早期人类遗址时,展示了下面两幅文物图片。

据此判断,该遗址最有可能是A.元谋人遗址B.半坡遗址C.北京人遗址D.河姆渡遗址5.以疏导为主治水,就是依据地势的高下,疏导高地的川流积水,使肥沃的平原能减少洪水泛滥的灾害。

因为发明了这种方法,治水有功,受到民众爱戴的中国原始部落首领是A.炎帝B.尧C.舜D.禹6.在远古传说中,有一历史人物能制作衣裳、制造船只、会炼铜。

现代考古工作者在河南、陕西、山西、甘肃等地发掘出距今8000-6000年的蚕茧、丝织品、独木舟和铜刀等。

这说明A.传说中包含一些历史信息B.考古是了解历史唯一途径C.传说中的内容都是真实的D.考古发现证实了所有传说7.以下是某同学制作的朝代更替表的一部分,空框中应填的是A. 西周、春秋B.春秋、战国C.东周、战国D.西周、东周8.历史谱写着歌曲,歌曲承载着历史。

“一玉口中国,一瓦顶成家,都说国很大,其实一个家……”歌曲中提到的“国家”在中国最早出现于A.夏朝B.殷朝C.商朝D.周朝9.某同学在阅读课外书时看到一张地图(如图),他推断这张地图反映的史实最早可能出现在A.夏朝B.商朝C.西周D.秦朝10.下图的两幅图片是出土于河南偃师二里头遗址的铜牌和铜鼎,其中的铜鼎是中国目前已发现的最早的青铜礼器,这两件文物的出土可以让我们了解哪一时期的历史A.尧舜时期B.夏朝C.商朝时期D.西周11.《中国古代衣食住行》一书中收录了一组商周时期青铜器的名称及其功能(如图)。

期中考试试题及答案

期中考试试题及答案

期中考试试题及答案一、不定项选择题(每小题5分)1、根据《劳动合同法》的规定,下列情形签订的劳动合同,无效的有:()A.用人单位甲与劳动者乙签订劳动合同,为期一年,工作内容是甲安排乙在衣服中夹带黄金交于广州某人B.某公司招聘启示中称“拟招聘文秘人员3名”。

3名劳动者在签订劳动合同后,发现他们的实际工作是筛选砂石C.用人单位甲与劳动者乙签订的劳动合同中缺少劳动保护条款D.甲与乙签订的劳动合同没有约定试用期AB2、根据劳动法律、法规的规定,因签订集体合同发生的争议,双方协商不成,应按以下程序解决()A.由当地人民政府信访机构协调处理B.由人民法院受理C.由劳动争议仲裁委员会受理D.由当地人民政府劳动行政部门组织有关各方协调解决D3、招用未满16周岁的未成年工,下列情况下用人单位可以报县级以上劳动行政部门批准的是()A.某家庭旅馆招用服务员B.某私营企业招用门卫值班人员C.某俱乐部招用体操运动员D.某职业介绍所招用职员C4、下列关于集体合同表述错误的是()A.集体合同草案需要有职工代表大会或者职工大会通过B.我国的集体合同的期限一般是1-3年C.变更集体合同需要由工会先提出D.在我国,依法签订的集体合同对于该企业的非工会会员也有效力C5、用人单位招用劳动者,不得扣押劳动者的()和其他证件,A、用工合同B、居民身份证C、暂住证D、钱物ABCD6、根据《劳动合同法》,下列关于解除劳动合同的说法错误的有()A.在试用期内劳动者可以随时解除合同B.劳动者同时与其他用人单位建立劳动关系,用人单位发现可以立即解除劳动合同C.用人单位未在约定的时间支付劳动报酬,劳动者可以解除劳动合同D.用人单位未为劳动者缴纳社会保险费的,劳动者可以解除劳动合同AB7、2003年,甲公司注册登记成立后,经有关部门批准,向社会公开招聘人员。

在甲公司与被录用人员吴冬订立的劳动合同中,下列情形不符合劳动法规定的有()A.劳动合同约定试用期为1年B.吴冬如被依法追究刑事责任,甲公司可以解除劳动合同C.在试用期间,吴冬被证明不符合录用条件,甲公司可以解除劳动合同D.为防止吴冬中途离职,合同期内吴冬的大学毕业证书由甲公司保管AD8、下列说法正确的是()A、非全日制用工可以不签书面劳动合同B、非全日制用工终止劳动关系需按规定支付经济补偿C、被派遣劳动者有严重违纪行为,用工单位可以解除劳动合同D、被派遣劳动者享有与用工单位同工同酬的权利AD9、下列说法错误的是()A、女职工怀孕期间劳动合同到期劳动关系终止,用人单位应当支付经济补偿B、用人单位合并或分立的,劳动合同终止,但劳动可要求合并或分立后的单位重新签订劳动合同C、劳动合同期满前劳动者可以单方解除劳动合同,但要承担相应的违约金D、竞业限制期内,用人单位不支付经济补偿的,劳动者可不受竞业限制条款的限制ABC10、属于劳动法适用范围的有()A.律师事务所文员B.法院中的聘用制书记员C.家庭保姆D.新招聘的大学老师ABD二、案例分析题(每小题25分,共50分)1、王某于2007年10月开始在甲公司上班,但没有签书面劳动合同。

期中考试试题库

期中考试试题库

期中考试试题库第一套一、判断题1. 公司章程是记载公司组织规范及其行为准则的书面文件,一经生效即对公司股东、董事、职工及公司债权人发生效力。

( × )2. 子公司具有法人资格,可独立承担民事责任。

( √ )3. 有限责任公司不得变更为股份有限公司,反之亦然。

( × )4. 公司的住所为其主要的办事机构所在地。

( √ )5. 公司是以其注册资本对公司的债务承担责任的。

( × )6. 公司不得向其他企业投资或为他人提供担保。

( × )7. 股东会是有限责任公司的权力机构。

( √ )8. 公司可以向其他企业投资并可作为对所投资企业的债务承担连带责任的出资人。

(×)9. 分公司并非公司法意义上的真正的公司。

( √ )10. 资本不变原则的含义是:一旦公司成立,其注册资本总额就不能再作改变。

( × )二、单项选择题1. 股份有限公司的发起人人数为 ( A )。

A. 2 人以上 200 人以下B. 2 人以上C. 5 人以上2. 华海机械制造有限责任公司于 2007 年 10 月向建设银行借款 300 万元,在借款未还的情况下,该公司于 2008 年 5 月变更为华海机械制造股份有限公司。

依照《公司法》规定,该借款应由华海机械制造股份有限公司偿还,理由是 ( B )。

A. 公司的股东未发生变化B. 公司法人资格延续C. 两个公司的股东都仅负有限责任3. 一个自然人可以投资设立 ( C ) 个一人有限责任公司。

A. 3B. 2C. 14. 甲、乙、丙、丁、戊五人共同投资 1000 万元人民币,设立金王股份有限公司。

该公司的注册资本分为 1000 万股,每股 1 元人民币。

甲、乙、丙三人分别持有 300 万股,丁、戊两人分别持有 50 万股。

该公司运营中的债务应由 ( B )。

A. 公司与股东共同承担B. 公司以其全部资产承担C. 甲乙丙丁戊五股东共同承担5. 募集设立是 ( C ) 。

语文期中考试题卷

语文期中考试题卷

【注】①马:指司马师、司马昭等司马氏。②三 征:即征南大将军王昶、征东大将军胡遵、镇南 大将军毋丘俭。③傅嘏:字兰石,魏雍州人。 6.对下列句中加点词的解释,不正确的一项 是( ) A.万安之计,是以相赏 相:表示动 作偏指一方 B.师又谢朝士曰 谢:道歉 C.诏引诸军转据北山 引:率领 D.谁任其咎 咎:失败 答案:D 咎:过错、罪过。
答题步骤:
1、 抓中心。浏览各句,看各句是围绕一个怎样的意思说的。 这样我们可以根据“中心句”或“总领句”来确定首句或 尾句。 2、排顺序。句群围绕中心组合句子,总是按一定顺序,或按 时间、或按空间、或按逻辑联系等。这其中应先找出关联 词、代词以及表时间、地点的词语,然后据此进行句间连 缀排列。 3、复读定。在上面排列的基础之上,再通读语段,分析思路 是否清晰并自然贯通,在整体审视之后,可最终确定。 4、对选项。对照选项,选出正确的答案。也可用排除法确定。
排列句序的方法:
排列句子顺序时,一要理清思路,二要抓语言标志, 如关联词、关键词、相同句式等。从方法上讲要先 确定首句和尾句,然后再排列中间句。也可从局部 入手,然后再向整体扩展。对于句子顺序,平时在 阅读中要注意典型段句与句之间的关系,尤其是句 子前后之间的衔接。 方法技巧:一般来说,语段的排序主要涉及到以下一 些因素: ①空间顺序:或从上到下,或从左到右, 或从里到外。 ②时间顺序:或从早到晚,或从过去 到现在等。若有回忆或描写上的使用插序手法等因 素,那就更应该仔细分析和推敲。 ③逻辑顺序:人 们认识事物的一般规律:或由易到难,或由浅入深, 或由表及里,或由此及彼,或由一般到个别,或由 个别到一般;也可为由概括到具体,或由具体到概 括…… 做题时一定要准确把握整体语段的基本内 容,找到其中体现顺序的那道“线”,然后才能进 行合理的排序。

期中考试试题

期中考试试题

期中考试试题
期中考试试题
•1、已知光发射功率为2mW ,光接收机灵敏度为-15dBm ,光纤衰减为0.5dB/km ,求光纤链路的长度。

•2、有阶跃型光纤,若n1=1.5,=1.3 ,则•1)若=0.2,为保证单模传输,光纤纤芯半径a 应取多大?•2)若芯径a= 4.5 ,保证单模传输,应怎样选择?•3、已知有一个信息速率为560Mb/s 的单模光纤传输系统,•1)光纤通信系统的光纤损耗为0.1dB/km ,有5个接头,平均每个接头损耗为0.2dB ,光源的入纤光功率为-3dBm ,接收机灵敏度为-56dBm 。

•2)光纤线路上采用5B6B 码型,光纤色散系数为2ps/(km,nm )•光源光谱宽带为1.8nm 。

(设计中选取色散代价为1dB ,光连接器损耗为1dB/个,光纤富余度为0.1dB/km ,设备富余度为5.5dB 。

•求:最大中继距离为多少?•4、光纤的结构分别由哪几部分组成?各部分作用是什么?光纤的三个传输窗口是什么?•5、光纤传输性能的主要指标有哪些,单位是什么?•
6、列出五种光无源器件的名称和用途?•
7、目前使用的外调制方式有哪些?∆0λm µ∆m µ。

数学期中考试测试题

数学期中考试测试题

数学期中考试测试题一、选择题(每题2分,共20分)1. 下列哪个数是最小的正整数?A. 0B. 1C. 2D. -12. 如果一个数的平方等于16,这个数是什么?A. 4B. -4C. 4 或 -4D. 163. 以下哪个表达式等于0?A. \( 5 - 5 \)B. \( 3 + 4 \)C. \( 2 \times 3 \)D. \( 6 ÷ 2 \)4. 圆的周长公式是 \( C = 2\pi r \),如果圆的半径是3,那么周长是多少?A. 6B. 12C. 18D. 245. 一个直角三角形的两条直角边分别是3和4,斜边是多少?A. 5B. 7C. 8D. 9二、填空题(每空1分,共10分)6. 一个数的绝对值是其本身或其相反数,例如,\( |5| = \)________。

7. 一个数的倒数是1除以这个数,例如,\( \frac{1}{3} \) 的倒数是 ________。

8. 一个长方体的长、宽、高分别是2cm、3cm、4cm,其体积是________。

9. 一个数的平方根是另一个数,这个数的平方等于原数,例如,\( 9 \) 的平方根是 ________。

10. 如果一个数的立方是-8,那么这个数是 ________。

三、计算题(每题5分,共15分)11. 计算下列表达式的值:\( (-3)^2 + 4 \times (-2) - 5 \)12. 解下列方程:\( 3x - 7 = 11 \)13. 简化下列分数表达式:\( \frac{3x^2 - 6x}{x - 2} \)四、解答题(每题10分,共25分)14. 一个长方体的长、宽、高分别是5cm、4cm、3cm,求其表面积和体积。

15. 一个直角三角形的两条直角边分别是6cm和8cm,求其斜边的长度。

16. 一个圆的半径是7cm,求其周长和面积。

五、应用题(每题30分,共30分)17. 一个班级有40名学生,其中男生人数是女生人数的2倍。

四川省成都市石室中学2023-2024学年八年级下学期期中考试英语试题(原卷版)

四川省成都市石室中学2023-2024学年八年级下学期期中考试英语试题(原卷版)

英语A 卷(共100分)第一部分 听力测试(共 30 小题,计 30 分)一、听句子,根据所听到的内容选择正确答语。

每小题念两遍。

(共5小题,每小题1分,计5分)1. A. OK!B. I’m fine.C. I have a cold.2. A. I’m sorry.B. Have a good time.C. That’s a good idea.3. A. It was heavy.B. So was I.C. In the afternoon.4. A. Yes, sure.B. No, thank you.C. I see.5. A. Don’t worry. B. No problem. C. I agree.二、听句子,选择与所听句子内容相符的图片,每小题念两遍。

(共5小题,每小题1分,计5分)A. B. C. D. E.6. ________7. ________8. ________9. ________ 10. ________三、听对话,根据对话内容及问题选择正确答案。

每小题念两遍。

(共10小题,每小题1分,计10分)11. A. Grace. B. Mary. C. Bob.12. A. Cleaning his room. B. Meeting his friends C. Washing the clothes.13. A. At 7:30. B. At 7:40. C. At 7:45.14. A. In the morning. B. In the afternoon. C. In the evening.15. A. To the history museum. B. To the animal hospital. C. To the old people’s home.16 A. At home. B. At the school. C. At the hospital.17. A. Teacher and parent. B. Brother and sister. C. Classmates.18. A. On Wednesday. B. On Thursday. C. On Friday.19. A. To walk the dog. B. To set the table C. To cook dinner.20. A. Surprised. B. Angry. C. Excited.四、听短文,根据短文内容选择正确答案,短文念两遍。

初一期中考试试题

初一期中考试试题

初一期中考试试题一、选择题(每题2分,共20分)1. 下列哪个选项是正确的?A. 两个奇数相加的结果是偶数。

B. 三个偶数相加的结果是奇数。

C. 一个偶数和一个奇数相加的结果是奇数。

D. 四个偶数相加的结果是偶数。

2. 以下哪个分数是最小的?A. 1/2B. 3/4C. 4/5D. 5/63. 英文单词“apple”的中文意思是什么?A. 香蕉B. 苹果C. 橘子D. 葡萄4. 以下哪个形状有四个直角?A. 三角形B. 圆形C. 正方形D. 长方形5. 以下哪个是北京的著名景点?A. 东方明珠B. 故宫C. 黄鹤楼D. 外滩6. 以下哪个单位用来测量长度?A. 千克B. 米C. 秒D. 摄氏度7. 以下哪个是地球上最大的洲?A. 亚洲B. 非洲C. 北美洲D. 南极洲8. 以下哪个是太阳系中的行星?A. 地球B. 月亮C. 太阳D. 恒星9. 以下哪个是中国古代的四大发明之一?A. 指南针B. 火药C. 印刷术D. 以上全部10. 以下哪个数学符号代表“不等于”?A. =B. ≠C. ≤D. ≥二、填空题(每题2分,共20分)11. 一个长方形的长是12厘米,宽是8厘米,它的周长是______厘米。

12. 一小时有______分钟。

13. 英文单词“dog”的中文意思是______。

14. 一年有______个月。

15. 以下是一个分数:2/3。

它的分子是______,分母是______。

16. 地球是太阳系中的一颗______。

17. 以下是一个面积公式:长方形面积 = 长× 宽。

如果长方形的长是10厘米,宽是5厘米,那么它的面积是______平方厘米。

18. 以下是一个数学表达式:5 + 3 × 2。

按照运算顺序,第一个计算的是______。

19. 中文“谢谢”用英文怎么说?请用英文写出:______。

20. 以下是一个几何图形:正方形。

它的四个角都是______度。

三、简答题(每题10分,共30分)21. 请简述《三国演义》中的“桃园三结义”故事。

(成都七中)四川省成都市第七中学2023-2024学年高一上学期期中考试化学试题(含答案)

(成都七中)四川省成都市第七中学2023-2024学年高一上学期期中考试化学试题(含答案)

成都七中2023-2024学年度上期高2023级半期考试化学试卷(考试时间:75分钟;试卷满分:100分)可能用到的相对原子质量:H-1 O-16 Na-23 S-32 Cl-35.5一、单项选择题(本题共14小题,每题3分,共42分)1.下列劳动项目与所涉及的化学知识叙述正确且有关联的是2.化学实验是化学探究的一种重要途径。

下列有关实验操作正确的是A.用过滤操作除去淀粉胶体中混有的NaCl杂质B.中学实验室中,不可将未用完的钠放回原试剂瓶C.进行焰色试验时,可用玻璃棒替代铂丝D.用湿润的淀粉-KI试纸检验Cl23.宏观辨识与微观探析是化学学科核心素养之一。

下列离子方程式书写完全正确的是A.氯气通入水中:Cl2+H2O=2H++Cl‒+ClO‒B.MnO2与浓盐酸反应制氯气:MnO2+4H++2Cl‒=Mn2++Cl2↑+2H2OC.向沸水中滴入饱和FeCl3溶液,煮沸至液体呈红褐色立即停热:Fe3++3H2O=Fe(OH)3↓+3H+ D.向NaHCO3溶液中加入等体积等浓度的Ba(OH)2溶液:HCO3−+Ba2++O H‒=BaCO3↓+H2O 4.NaCl是实验室中的一种常用试剂。

下列与NaCl有关的实验,描述正确的是A.海水晒盐过程主要发生化学变化B.应透过蓝色钴玻璃观察NaCl在灼烧时的焰色,从而检验Na元素C.进行粗盐提纯时,可向上层清液中继续滴加2~3滴BaCl2溶液以检验SO42‒是否除尽D.除去NaCl溶液中的NaHCO3:加适量NaOH溶液5.归纳总结是化学学习的重要方法。

NaHSO4稀溶液的部分化学性质总结如下。

下列说法错误的是A.性质①说明NaHSO4溶液显酸性B.性质②中发生反应的离子方程式为Ba2++SO42‒=BaSO4↓C.性质③中反应生成的气体是H2,该反应属于置换反应D.以上性质说明NaHSO4溶液具有酸的通性,在某些反应中可以代替稀H2SO46.利用如图装置进行Cl2的制备及性质探究实验时,下列说法错误的是A.甲中反应的氧化剂与还原剂的物质的量之比为1∶4B.乙的作用为除去Cl2中的HClC.丙中紫色石蕊试液先变红后褪色D.为吸收多余的Cl2,丁中可盛放NaOH溶液7.一块绿豆大小的钠块加入到盛有一定量水的烧杯中,反应现象十分丰富。

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期中考试试题·Anne Whitney, a sophomore at Colorado State University, first had a problem taking tests when she began college. "I was always well prepared for my tests. Sometimes I studied for weeks before a test. Yet I would go in to take the test, only to find I could not answer the questions correctly. I would blank out because of nervousness and fear. I couldn't think of the answer. My low grades on the tests did not show what I knew to the teacher." Another student in microbiology had similar experiences. He said, "My first chemistry test was very difficult. Then, on the second test, I sat down to take it, and I was so nervous that I was shaking. My hands were moving up and down so quickly that it was hard to hold my pencil. I knew the material and I knew the answers. Yet I couldn't even write them down."These two young students were experiencing something called test anxiety, because a student worries and is uneasy about the test, his or her mind does not work as well as it usually does. The student cannot write or think clearly because of the extreme tension and nervousness. Although poor grades are often a result of poor study habits, sometimes test anxiety causes the low grades. Recently, test anxiety has been recognized as a real problem, not just an excuse or a false explanation of lazy students.Special university counseling courses try to help students. In these courses, counselors try to help students by teaching them how to manage test anxiety. At some universities, students take tests to measure their anxiety. If the tests show their anxiety is high, the students can take short courses to help them deal with their tension. These courses teach students how to relax their bodies. Students are trained to become calm in very tense situation. By controlling their nervousness, they can let their minds work easy. Learned information then comes out without difficulty on a test.An expert at the University of California explains, "With almost all students, relaxation and less stress are felt after taking our program. Most of them experience better control during their tests. Almost all have some improvement. With some, the improvement is very great."1 The main idea of the passage is __________.how universities in the U.S.A. solved students' problemshow the students overcame their test nervousnesshow students were helped to overcome their test nervousnesshow experts worked to deal with students' test anxiety2 Anne Whitney got low grades in her first test because ________.she had not been used to the environment of the university yetshe was reluctant to show what she knew to the teachershe had not really been prepared well for her testshe was too nervous to answer the questions3According to an expert at the University of California, __________.all students could overcome the anxiety after taking a special test anxiety programalmost all students felt less stress after taking a counseling course at his universitystudents found it difficult to improve even though they had taken a special test anxiety program students found it easy to relax as soon as they entered the special test anxiety program4. The phrase "blank out" in Para. 1 most probably means to __________.cross out a column in order to invalidate itdisappear slowly but graduallybecome confused about somethingunderstand something thoroughly5 We can infer from the passage that test anxiety __________.prevents students from giving full play to their knowledgeis the result of some students' excuses and lazinessexplains why students get low grades in their testsmainly affects new students at universitiesQuestions 6 to 10 are based on the following passage.According to a report, around 30,000 pupils started secondary school last year with the math skills of a seven-year-old. MPs (国会议员) warned that many young people would need “expensive” remedial lessons in later life to get a job — posing major problems for the economy. The findings came just months after Ofsted(教育标准办公室)claimed almost half of math lessons in English schools were not good enough. It said many teachers relied on textbooks and mundane exercises to make sure pupils passed exams at the expense of a proper understanding of the subject. MPs backed the conclusions, saying too many pupils found lessons “boring”. They insisted improvements had been made under Labor but achievement had “leveled off” in recent years.In 2008, 79 percent of pupils me t the Government’s expected standard at the end of primary school, well short of the 85 percent target set for 2006. Around five percent moved to secondary school with the math skills of a seven- year-old, said the committee. In 2006, £2.3 billion was spent teaching the subject. It equates to around a quarter of the £10 billion total budget for primary teaching and support staff.The report said the Department for Children, Schools and Families (DCSF) needed to “radically rethink its strategy for improvi ng pupil attainment; otherwise we seriously doubt that the department will meet its 2011 target”. The target demands that 84.5 percent of pupils will make the necessary progress between 7 and 11.Last year, the DCSF published a major review of math education in England to boost standards. It called for a math specialist in every primary school within 10 years and more emphasis on mathematical “play” in nursery schools. Mr. Leigh said, “The department’s 10-year program to train 13,000 specialist math teachers will not benefit some primary schools for another decade. That’s far too long; the department needs to look for ways to accelerate the program.” Sarah McCarthy Fry, the Schools Minister, said, “We have already accepted the main recommendation from a recent independent review of primary math that every school should havea specialist math teacher and have pledged £24 million over the next three years for a training program for teachers.”Nick Gibb, the Tory shadow schools secretary, said, “The Govern ment is not getting value for the money they have piled into education and the country is falling behind in international league tables as a result. The Government has failed to replace methods of teaching which have failed with tried and tested methods used in countries that have much higher levels of math achiev ement.”6 What do we learn from the first paragraph?A) 30,000 pupils started secondary school with poor math skills.B) MPs insist more improvements should be made under Labor.C) Young people need medical lessons to get a job.D) Half of English schools were not good enough.7 According to the passage, what happened in 2006?A) 21% of pupils didn’t meet the Government’s expected standard.B) The target set for 2006 was 87 percent.C) £2.3 billion was spent on math teaching.D) The total budget for primary teaching and support staff was £5 billion in 2006.8. What will people probably do to improve math education in England?A) Spend money on training specialist math teachers.B) Hire a math specialist for every primary school.C) Allow pupils to have more mathematical “play”.D) Spend more time on math education.9 What do Nick Gibb’s words mean?A) The British government should put more money into math education.B) Britain is falling behind in the international knowledge competition.C) The British govern ment should learn from other countries’ failures.D) The British government should change their teaching methods every few years.10. What’s the passage mainly talking about?A) There aren’t enough math teachers in British primary schools.B) T he British government didn’t spend enough money on math education.C) British pupils are not good at math.D) Math lessons in British primary schools need to be improved.Passage TwoQuestions 11to 15are based on the following passage.Bananas, always the fashion victims of the produce section, are wearing another new label this spring. Bananas with “Fair Trade Certified” stickers have been available in the United States since October. They represent the new front of an international effort to help first-world consumers improve the living standards of the third-world farmers who grow much of their food.By expanding its reach to the produce section, Fair Trade is now trying to reach the American supermarket shopper. Fair Trade deals directly with farmer cooperatives. It helpsorganize, avoiding brokers (代理人) and middlemen. It guarantees higher prices fo r the farmers’ goods and helps them set up schools and health clinics.The Fair Trade movement took root in Europe in the 1990’s as a way of bolstering coffee farmers as prices were collapsing. Since Fair Trade began, more than a million coffee growers and other farmers have joined cooperatives that sell their products through Fair Trade channels instead of directly to a commercial producer.Not everyone is greeting the Fair Trade label with open arms. Several American coffee importers recently pulled out of Fair Trade, citing TransFair’s “corporate friendly” policies that allow large companies to use the Fair Trade logo in their marketing even if only a small amount of the company’s overall purchases are Fair Trade certified.Edmund LaMacchia, the national produce coordinator for Whole Foods, said Fair Trade is only one of many consumer choices. “Whole Foods has its own team of inspectors and has no plans to carry Fair Trade products”, Mr. LaMacchia said. “Our standards are higher than Fair Trade’s,actually.” Fair Trade is only one of several labels your bananas might be wearing this year. Another is that of the Rainforest Alliance, which certifies the use of sustainable agriculture methods.So far, though, Fair Trade is the biggest. A Fair Trade label by itself does not guarantee an organic product, but most Fair Trade bananas are also organic, Ms. Bourque said, because pesticides are usually too costly for the small farmers who grow them. If the bananas are organic, they will be labeled as such, and will probably be wearing a sticker to prove it.11. Why are bananas wearing “Fair Trade Certified” stickers?A) It means bananas are the fashion victims of the produce section.B) It means bananas have got a new label.C) It means bananas with these stickers are available in the United States.D) It represents an international effort to help the third-world farmers.12. What does Fair Trade do?A) It helps farmers sell their products for a higher profit.B) It appoints brokers and middlemen to deal with farmer cooperatives.C) It brings down the price of farmers’ goods.D) It sets up schools and health clinics for American farmers.13 What was the original purpose of the Fair Trade movement?A) To cooperate with coffee growers and other farmers.B) To help coffee farmers as prices were collapsing.C) To prevent farmers from selling their products to commercial producers.D) To sell products through coffee growers and other farmers.14What can we infer from this passage?A) American coffee importers will never buy their products through Fair Trade channels.B) Fair Trade is the only label that bananas might be wearing this year.C) Not every consumer considers Fair Trade products the only choice.D) Whole Foods and the Rainforest Alliance are more influential than Fair Trade.15 What is the best title for this passage?A) Helping the Third World: One Banana at a TimeB) Consumers Face More ChoicesC) Fair Trade — the Best StickerD) The Fair Trade MovementNo one knows when the first calendar was developed. But it seems possible that it was based on lunar months. When people started farming, the sages of the tribes became very important, they studied the sky and gathered enough information to be able to predict when the seasons would change, and were able to announce when it was time to plant crops.The divisions of time we use today were developed in ancient Babylonia 4,000 years ago.Babylonian astronomers believed the sun moved around the Earth every 365 days.They divided the trip into 12 equal parts, each with 30 days. Then they divided each day into 24 equal parts, or hours, and divided each hour into 60 minutes, each minute into 60 seconds.Humans have used many devices to measure time; the sundial (日晷) was one of the earliest and simplest. However, the sundial worked well only when the weather was fine, so other ways of measuring the passing of time were invented. One device was the hourglass(沙漏). By the eighteenth century, people had developed mechanical clocks and watches. So we have devices to mark the passing of time, but what time is it now? Clocks in different parts of the world do not show the same time at the same time, because time on Earth is set by the sun’s positions in the sky above us. As international communications and travel grew, it became clear that a way to establish a common time for all parts of the world was needed. In 1884, an international conference divided the world into 24 time zones, each zone represents one hour. The astronomical observatory in Greenwich, England, was chosen as the starting point for the time zones. Twelve zones are west of Greenwich. Twelve are east. The time at Greenwich measured by the sun is considered by astronomers to be Universal Time, also known as Greenwich Mean Time.16. Which of the following is the best title for this passage?A) The Development of Universal Time.B) Different Ways to Measure Time.C) Why We Measure Time the Way We do.D) How the Calendar Came into being.17. What does the example of Babylonia astronomers reveal?A) It reveals Babylonians’wisdom that was absent elsewhere.B) It reveals the origin of our time measurements.C) It reveals the limits of some time measurements.D) It reveals the stability of time measurements.18. The author mentions all of the following ways to measure time EXCEPT .A) sundial B) hourglass C) electric clock D) mechanical clock19. According to the passage, Greenwich Mean Time .A) provides a common time for all parts of the worldB) is calculated from the sunC) is the 12th of the 24 time zonesD) was named after an international conference20. With which of the following statements would the author be most likely to agree?A) Time measurements have changed in response to need and technological development.B) In ancient Babylonia, 12 was the basic division of time.C) The first calendar was developed because the sages of tribes were intelligent.D) Universal Time is so named because it is applicable throughout the universe. Global warming is causing more than 300,000 deaths and about $125 billion in economic losses each year, according to a report by the Global Humanitarian Forum, an organization led by Annan, the former United Nations secretary general.The report, to be released Friday, analyzed data and existing studies of health, disaster, population and economic trends. It found that human-influenced climate change was raising the global death rates from illnesses including malnutrition (营养不良) andheat-related health problems.But even before its release, the report drew criticism from some experts on climate and risk, who questioned its methods and conclusions.Along with the deaths, the report said that the lives of 325 million people, primarily in poor countries, were being seriously affected by climate change. It projected that the number would double by 2030.Roger Pielke Jr., a political scientist at the University of Colorado, Boulder, who studies disaster trends, said the Forum's report was "a methodological embarrassment" because there was no way to distinguish deaths or economic losses related to human-driven global warming amid the much larger losses resulting from the growth in populations and economic development in vulnerable (易受伤害的) regions. Dr. Pielke said that “climate change is an important problem requiring our utmost attention.” But the report, he said, "will harm the cause for action on both climate change and disasters because it is so deeply flawed (有瑕疵的)."However, Soren Andreasen, a social scientist at Dalberg Global Development Partners who supervised the writing of the report, defended it, saying that it was clear that thenumbers were rough estimates. He said the report was aimed at world leaders, who will meet in Copenhagen in December to negotiate a new international climate treaty.In a press release describing the report, Mr. Annan stressed the need for the negotiations to focus on increasing the flow of money from rich to poor regions to help reduce their vulnerability to climate hazards while still curbing the emissions of the heat-trapping gases. More than 90% of the human and economic losses from climate change are occurring in poor countries, according to the report.21 What is the finding of the Global Humanitarian Forum?A) Global temperatures affect the rate of economic development.B) Rates of death from illnesses have risen due to global warming.C) Malnutrition has caused serious health problems in poor countries.D) Economic trends have to do with population and natural disasters.22What do we learn about the Forum's report from the passage?A) It was challenged by some climate and risk experts.B) It aroused a lot of interest in the scientific circles.C) It was warmly received by environmentalists.D) It caused a big stir in developing countries.23. What does Dr. Pielke say about the Forum's report?A) Its statistics look embarrassing. C) It deserves our closest attention.B) It is invalid in terms of methodology. D) Its conclusion is purposely exaggerated.24 What is Soren Andreasen's view of the report?A) Its conclusions are based on carefully collected data.B) It is vulnerable to criticism if the statistics are closely examined.C) It will give rise to heated discussions at the Copenhagen conference.D) Its rough estimates are meant to draw the attention of world leaders.25 What does Kofi Annan say should be the focus of the Copenhagen conference?A) How rich and poor regions can share responsibility in curbing global warming.B) How human and economic losses from climate change can be reduced.C) How emissions of heat-trapping gases can be reduced on a global scale.D) How rich countries can better help poor regions reduce climate hazards.Barack Obama was born to a white American mother, Ann Dunham, and a black Kenyan father, Barack Obama, Sr., who were 31 young college students at the University of Hawaii. When his 32 left for Harvard, Barack and his mother stayed behind, and his father 33 returned alone to Kenya, where he worked as a government economist. Barack’s mother 34 an Indonesian oil manager and moved to Jakarta when Barack was six. He later 35 Indonesia as simultaneously lush and a harrowing 36 to tropical poverty. He returned to Hawaii, where he was 37 up largely by his grandparents. The family lived in a small apartment —his grandfather was a furniture salesman and an unsuccessfulinsurance agent and his grandmother 38 in a bank — but Barack managed to get into Punahou School, Hawaii’s top prep 39 . His father wrote to him regularly but, though he traveled around the world on official 40 for Kenya, he visited only once, when Barack was ten.Obama attended Columbia University, but found New York’s racial tension 41 . He became a community organizer for a small Chicago church-based group for three years, helping poor South Side residents 42 with a wave of plant closings. He then attended Harvard Law School, and in 1990 became the first 43 -American editor of the Harvard Law Review. He turned down a 44 judicial clerkship, choosing instead to practice civil-rights law back in Chicago, 45 victims of housing and employment 46 and working on voting-rights legislation. He also began teaching at the University of Chicago Law School. Eventually he 47 as a Democrat for the state senate seat from his district, which included both Hyde Park and some of the poorest ghettos on the South Side, and won.In 2004 Obama was 48 to the U.S. Senate as a Democrat, representing Illinois, and gained national attention by giving a rousing and 49 keynote speech at the Democratic National Convention in Boston. In 2008 he ran 50 president as a democrat and won. He is set to become the 44th president of the Unites States and the first African-American ever elected to that position.31. A) both B) either C) neither D) each32. A) son B) father C) daughter D) mother33. A) only B) ultimately C) simply D) initially34. A) remarried B) taught C) remained D) acted35. A) took B) suspected C) recounted D) figured36. A) exposition B) exposure C) expectation D) exhibition37. A) brought B) given C) turned D) cheered38. A) died B) worked C) educated D) lived39. A) army B) allocation C) academy D) association40. A) apprentice B) market C) sale D) business41. A) important B) impossible C) inescapable D) indispensable42. A) match B) agree C) cope D) connect43. A) African B) Asian C) European D) Latin44. A) profound B) perfect C) possible D) prestigious45. A) saving B) commenting C) calling D) representing46. A) dispute B) discrimination C) difference D) disposal47. A) ran B) jogged C) competed D) formed48. A) gone B) elected C) moved D) suggested49. A) massive B) well-received C) dull D) tedious50. A) for B) as C) in D) withRobert Edwards 67 in an unusual accident many years 68 .He was also partially deaf 69 old st week he was walking near his home 70 a thunderstorm 71 .He took shelter72 a tree and was struck by lightning.He was 73 to the ground and woke up 74 20 minutes later, 75 face down in water below a tree.He went into the house and lay down in bed.A short time late r he awoke.His legs couldn’t move 76 he was trembling. 77 ,when he opened his eyes he could see the clock 78 the room in front of him. 79 his wife entered he saw her for the first time in nine years. Doctors confirmed that he had 80 his sight and hearing apparently 81 the flash of lightning.But they were unable to explain the 82 . One possible explanation 83 by one doctor was that Edwards lost his sight 84 a hard blow in a terrible accident.Perhaps the only way it could 85 was by 86 blow.67. A) blinded B)was blindedC)had been blind D)had been blinded68. A) later B)before C)ago D)early69. A) because of B)becauseC)at D)in70. A) when B)while C)until D)where71. A) fell B) blewC)formed D)approached72. A) in B)on C)under D)near73. A) thrown B)knocked C)fallen D)beaten74. A) just B)some C)for D )within75. A) to lie B)having lainC)lay D)lying76. A) and B) when C) but D) while77. A) Thus B) Therefore C) But D) Above all78. A) across B) through C) into D) out of79. A) While B) WhenC)Whenever D)As80. A) gained B)gottenC) reminded D)regained81. A) at B)in C)from D) on82. A) result B)reasonC)consequence D)content83. A) offered B)contributedC)sought D) thought84. A) because of B)owing toC)based on D)as a result of85. A) restore B)be restoredC)have restored D)have been restored86. A) other B) the other C)another D)one·Directions: There are 30 incomplete sentences in this part. For each sentence there are four choices marked A), B), C) and D). Choose the ONE answer that best completes thesentence. Then mark the corresponding letter on the Answer Sheet with a single line through the centre.31. The machine looked like a large, ,old-fashioned typewriter.A) forcefulB) clumsyC) intenseD) tricky32. Though she began her by singing in a local pop group,she is now a famous Hollywood movie star.A) employmentB) careerC) occupationD) profession33. Within two weeks of arrival, all foreigners had to with the local policeA) inquireB) consultC) registerD) profession34. Considering your salary, you should be able to at least twenty dollars a week.A) put forwardB) put upC) put outD) put aside35. As he has our pratience,we’ll not wait for him any longer.A) tornC) exhaustedD) consumed.j36. These teachers try to be objective when they the integrated ability of their studentsA) justifyB) evaluateC) indicateD) reckon37. Mrs. Morris's daughter is pretty and ,and many girls envy her.A) slenderB) lightC) faintD) minor38. Tomorrow the mayor is to a group of Canadian businessmen on a tour of the city.A) coordinateB) cooperateC) accompanyD) associate39. I'm enough to know it is going to be a very difficult situation to compete against three strong teams.A) realisticB) consciousC) registerD) resolve40. Can you give me even the clue as to where her son might be?A) simplestC) leastD) utmost41. Norman Davis will be remembered by many with not only as a great scholar but also as a most delightful and faithful friend.A) kindnessB) friendlinessC) warmthD) affection42. Salaries for positions seem to be higher than for permanent ones.A) legalB) optionalC) voluntaryD) temporary43. Most people agree that the present role of women has already affected U.S. society.it has affected the traditional role of men.A) Above allB) In allC) At mostD) At last44. Science and technology have in important ways to the improvement of agricultural production.A) attachedB) assistedC)contributed45. As an actor he could communicate a whole of emotions.A) frameB) rangeC) numberD) scale46. This is what you should bear in mind: Don't a salary increase before you actually get it.A) hang onB) draw onC) wait onD) count on47. The ship's generator broke down, and the pumps had to be operated instead of mechanically.A) artificiallyB) automaticallyC) manuallyD) synthetically48. The little girl was so frightened that she just wouldn't her grip on my arm.A) loosenB) removeC) relieveD) dismiss49. He never arrives on time and my is that he feels the meetings are useless.A) preferenceC) inferenceD) reference50. Mrs. gmithwas so about everything that no servants could please her.A)speeificB) speeialC)preciseD)particular51. Last night he saw two dark enter the building,and then there was the explosion.A) featuresB) figuresC) sketchesD) images52. It is obvious that this new rule is applicable to everyone withoutA) exceptionB) exclusionC) modificationD) substitution53. His temper and personalky show that he can become a soldier of the topA) circleB) rankC) categoryD) grade54. During the lecture, the speaker occasionally his point by relating his own experiences.A) illustratedB) hintedC) citedD)displayed55. Only those who can to lose their money should make high-risk investments.A) maintainB) sustairtC) endureD)afford56, He found the media attention intolerable and decided to go abroad.A) sufficientB) constantC) steadyD) plenty57. There has been a collision a number of cars on the main road to town.A) composingB) consistingC) involvingD) engaging58. elephants are difthrent from wild elephants in many aspects, including their tem-pers.A) CultivatedB) RegulatedC) CivilD) Tame59. Ten days ago the young man info~ed his boss of his intention to。

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