人教版八年级下第五单元测试卷(含答案)
(完整版)人教版八年级英语下第五单元随堂测试题
人教版八年级英语下第五单元随堂练习姓名。
一、听力理解(10分)(Ⅰ)录音中有五组对话及五个问题, 听一遍后, 选择最佳答案。
(5分)1. A. She was sleeping. B. She was doing her homework. C. She was doing housework.2. A. Yesterday afternoon. B. Yesterday morning. C. Last night.3. A. At home. B. In the street. C. On the playground.4. A. It’s big. B. It’s strange. C. It’s beautiful.5. A. He was watching TV. B. He was talking on the phone. C. He was waiting for the bus.(Ⅱ)录音中有一段对话, 听两遍后, 选择最佳答案。
(5分)6. What’s the woman’s name? A. Celia. B. Mike. C. Sam.7. Where was she at 3 o’clock yesterday afternoon? A. At the desk. B. At the gate. C. At home.8. What was Mike doing then? A. Talking to a customer. B. Counting money. C. Working on the computer.9. What time did the woman leave the bank? A. At 10: 00 p. m. B. At 5: 00 p. m. C. At 4: 30 p. m.10. How many people were there in the bank? A. Three. B. Six. C. Seven.二、单项选择(20分)( )1. We all know that the sun in the east. A. raise B. rose C. rises D. raises( )2. My brother was waiting for the bus at the bus stop.A. yesterdayB. at that timeC. tomorrowD. now( )3. Sally worked very hard. Finally, she won the English competition.A. At the end ofB. At lastC. LuckilyD. To the end( )4. An accident at the corner of the street yesterday.A. takes placeB. happenedC. happensD. take place( )5. I the airport very early. A. reached to B. got to C. arrived in D. arrived( )6. the boys were fighting, the police arrived.A. ThenB. WhileC. BeforeD. As soon as( )7. Did you the terrible news? A. heard about B. hear about C. hear from D. heard from( )8. —What to you this morning? —I lost my wallet.A. happenB. happenedC. is happenedD. was happening( )9. Do you remember at 10 a. m. yesterday?A. what are you doingB. what you are doingC. what were you doingD. what you were doing( )10. When I visited my cousin Tom yesterday, he the Internet.A. surfsB. surfedC. was surfingD. is surfing( )11. I bought alarm clock last week. A. a B. an C. the D. /( )12. —Mary called you this morning. But nobody answered. —Sorry. I the flowers in the garden.A. am wateringB. was wateringC. waterD. watered( )13. It was reported that nine Chinese people in a balloon crash(坠毁)in Egypt on February 26, 2013.A. are killedB. were killedC. will killD. have killed( )14. Please call me as soon as you the USA. A. get to B. reach to C. arrive at D. come ( )15. —Jenny was doing her homework at eight o’clock last night. —You are. I saw her in the cinema at that time.A. hard-workingB. kiddingC. kidD. kidded( )16. —Could you tell me what he said just now? —Sorry, I what was happening outside.A. had thoughtB. was thinkingC. thoughtD. think( )17. —I was at the cinema at nine yesterday evening. What about you? —I books.A. am readingB. was readingC. will readD. had read( )18. —What were you doing it was raining? —I was reading a book.A. beforeB. ifC. whileD. after( )19. Paul walked into the bedroom because his wife and baby were sleeping.A. silentB. silenceC. in silenceD. loudly( )20. During the past two years, several earthquakes in different places of the world.A. happenB. happenedC. take placeD. took place三、完形填空(10分)Evening came. It was time for Mr. Bell to close his shop. He was checking his money. His son Tom, who was 15, had just gone outside to buy a piece of newspaper. Just then, a big man walked1the shop. He had a gun(枪)in his hand.When Tom came back, he could hear the man asking his father for2. Tom could see the gun in the man’s hand, but the man didn’t3or hear Tom.Tom hurried up to the street. He looked for the police, 4he didn’t find anyone. Then Tom saw an old baseball bat(棒球球棒)5in the street. “Maybe this will help, ”he thought. He ran6with it.His father was just giving some of the money to the man. The man was watching Tom’s father. Tom knew he could not7long. “Now is the time. I must do it now. ”Tom went up to the man and knocked him down8the bat.Tom and his father then ran outside. This time they found the9and told them what had happened. The police 10went to the shop and caught the man.( )1. A. out of B. around C. into D. down( )2. A. paper B. water C. money D. food( )3. A. know B. catch C. meet D. see( )4. A. but B. so C. for D. or( )5. A. lies B. to lie C. lying D. is lying( )6. A. back B. over C. away D. past( )7. A. hold B. wait C. rest D. watch( )8. A. by B. from C. without D. with( )9. A. neighbors B. police C. frien D. children( )10. A. quick B. slow C. quickly D. slowly四、阅读理解(10分) AOur reporter asked people what they were doing on July 20th, 1969 when man first walked on the moon. Here is what they said:Kate Jones, waitress I remember that day very well. I was fifteen years old. It was a hot and humid day, and I was with my family in the mountains. We were having a picnic. We didn’t see the moon landing when it happened, but we were thinking about it. We saw it later on the TV news.John Bates, postman I was eighteen years old. It was a very exciting day. I was watching TV at home when the astronaut walked on the moon. His name was Neil Armstrong. I remember he could jump really high because people aren’t so heavy on the moon. When he returned, he became a national hero in America, and famous all over the world.Paul Robinson, doctor I was twelve. I remember the day, but I don’t remember what I was doing. I remember I wanted to go to the moon, too. My dream was to become an astronaut and fly in a rocket. I wanted to see the earth from the moon. The astronauts on the moon said that the earth looked very beautiful from there.Linda Brown, clerk I was working that day. I was twenty then. I didn’t see the man land on the moon because I was busy. Of course I knew about it. I read about it in the newspaper the next day. I thought it was amazing. Maybe one day people will travel to the moon for vacations!Mark Green, teacher I was only seven years old then. My parents talked about it, and I learned about it later in school, but I don’t remember the day. I was too young to remember. Maybe I was having fun in the playground with my friends when it happened.根据短文内容, 判断正误(T/F)。
(常考题)人教版初中数学八年级数学下册第五单元《数据的分析》测试(包含答案解析)
一、选择题1．某中学足球队的18名队员的年龄情况如下表：则这些队员年龄的众数和中位数分别是（ ） A ．15，15 B ．15，15.5C ．15，16D ．16，152．若一组数据2，3，4，5，x 的方差与另一组数据5，6，7，8，9的方差相等，则x 的值为（ ）. A ．1 B ．6 C ．1或6 D ．5或63．小亮同学想知道自己的体重在班级中是否属于中等水平，则需了解全班同学体重的（ ） A ．平均数 B ．中位数C ．众数D ．极差4．将一组数据中的每一个数减去50后，所得新的一组数据的平均数是2，则原来那组数据的平均数是（ ） A ．50B ．52C ．48D ．25．如果将所给定的数据组中的每个数都减去一个非零常数，那么该数组的 （ ） A ．平均数改变，方差不变 B ．平均数改变，方差改变C ．平均数不变，方差改变 D ．平均数不变，方差不变 6．给出下列命题：①三角形的三条高相交于一点；②如果一组数据中有一个数据变动，那么它的平均数、众数、中位数都随之变动； ③如果不等式()33m x m ->-的解集为1x <，那么3m <；④如果三角形的一个外角等于与它相邻的一个内角则这个三角形是直角三角形； 其中正确的命题有( ) A ．1个B ．2个C ．3个D ．4个7．为了让市民享受到更多的优惠，相关部门拟确定一个折扣线，计划使50%左右的人获得折扣优惠．某市针对乘坐地铁的人群进行了调查．调查小组在各地铁站随机调查了该市1000人上一年乘坐地铁的月均花费（单位：元），绘制了频数分布直方图，如图所示．下列说法正确的是（ ）①每人乘坐地铁的月均花费最集中的区域在80~100元范围内；②每人乘坐地铁的月均花费的平均数范围是40~60元范围内；③每人乘坐地铁的月均花费的中位数在60~100元范围内；④乘坐地铁的月均花费达到80元以上的人可以享受折扣．A．①②④B．①③④C．③④D．①②8．已知数据x，4，0，3，-1的平均数是1，那么它的众数是（）A．4 B．0 C．3 D．-19．有一组数据：1，1，1，1，m．若这组数据的方差是0，则m为（）A．4-B．1-C．0 D．110．某小组7名学生的中考体育分数如下：37，40，39，37，40，38，40，该组数据的众数、中位数分别为（）A．40，37B．40，39C．39，40D．40，3811．下表记录了甲、乙、丙、丁四名同学最近几次数学考试成绩的平均数与方差:要选择一名成绩好且发挥稳定的同学参加数学比赛，应该选择( )A．甲B．乙C．丙D．丁12．为了解某小区“全民健身”活动的开展情况，随机对居住在该小区的40名居民一周的体育锻炼时间进行了统计，结果如下表：锻炼时间（时）34567人数（人）6131452这40名居民一周体育锻炼时间的众数和中位数是( )A．14,5 B．14,6 C．5,5 D．5,6第II卷（非选择题）请点击修改第II卷的文字说明参考答案二、填空题13．据统计，某车间10名员工的日平均生产零件个数为8个，方差为2.5个2，引入新技术后，每名员工每天都比原先多生产1个零件，则现在日平均生产零件个数为______个，方差为______个2．14．如图是甲、乙两人6次投篮测试（每次投篮10个）成绩的统计图，甲、乙两人测试成绩的方差分别记作2S 甲、2S 乙，则2S 甲____2S 乙．（填“＞”，“＝”或“＜”）15．若这8个数据-3, 2,-1,0,1,2,3,x 的极差是11,则这组数据的平均数是______. 16．已知一组数据－1，x ，0, 1，－2的平均数是0，这组数据的极差和标准差分别是 _____17．若一组数据4,,5,,7,9x y 的平均数为6，众数为5，则这组数据的方差为__________． 18．某校在“爱护地球，绿化祖国“的创建活动中，组织了100名学生开展植数造林活动，其植树情况整理如下表： 植树棵数（单位：棵） 4 5 6 8 10 人数（人）302225158则这100名学生所植树棵数的中位数为_____．19．一组数据：1，2，x ，y ，4，6，其中x ＜y ，中位数是2.5，众数是2．则这组数据的平均数是______；方差是______．20．某同学记录了自己一周每天的零花钱（单位：元），分别如下：5，4.5，5，5.5，5.5，5，4.5这组数据的众数和平均数分别是_______和_______.三、解答题21．“绿水青山就是金山银山”，北京市民积极参与义务植树活动．小武同学为了了解自己小区300户家庭在2018年4月份义务植树的数量，进行了抽样调查，随即抽取了其中30户家庭，收集的数据如下（单位：棵）： 1 1 2 3 2 3 2 3 3 4 3 3 4 3 3 5 3 4 3 4 4 5 4 5 3 4 3 4 5 6（1）对以上数据进行整理、描述和分析：①绘制如下的统计图，请补充完整；②求这30户家庭2018年4月份义务植树数量的平均数是和中位数分别是多少？（2）“互联网+全民义务植树”是新时代首都全民义务植树组织形式和尽责方式的一大创新，2018年首次推出义务植树网上预约服务，小武同学所调查的这30户家庭中有7户家庭采用了网上预约义务植树这种方式，由此可以估计该小区采用这种形式的家庭有多少户？22．在全民读书月活动中，某校随机抽样调查了一部分学生本学期计划购买课外书的费用情况，根据图中的相关信息，解答下面问题；（1）这次调查获取的样本容量是________；（2）由统计图可知，这次调查获取的样本数据的众数是________；中位数是________；（3）若该校共有1000名学生，根据样本数据，估计该校本学期计划购买课外书的总花费．23．某校学生会向全校2400名学生发起了爱心捐款活动，为了解捐款情况，学生会随机调查了部分学生的捐款金额，并用得到的数据绘制了如下统计图１和图2，请根据相关信息，解答系列问题：（1）本次接受随机抽样调查的学生人数为人，图1中m的值是；（2）求本次调查获取的样本数据的平均数和中位数；（3）根据样本数据，估计该校本次活动捐款金额为10元的学生人数．24．某校八年级有800名学生，在一次跳绳模拟测试中，从中随机抽取部分学生，根据其测试成绩制作了下面两个统计图，请根据相关信息，解答下列问题：（1）本次抽取到的学生人数为______，扇形统计图中m的值为______．（2）本次调查获取的样本数据的众数是_____（分），中位数是_____（分）．（3）根据样本数据，估计我校八年级模拟体测中得12分的学生约有多少人？25．某市射击队为从甲、乙两名运动员中选拔一人参加省比赛，对他们进行了六次测试，测试成绩如下表(单位：环)：第1次第2次第3次第4次第5次第6次甲10988109乙101081079根据表格中的数据，可计算出甲、乙两人的平均成绩都是9环．（1）分别计算甲、乙六次测试成绩的方差；（2）根据数据分析的知识，你认为选______名队员参赛．26．八（2）班组织了一次经典朗读比赛，甲、乙两队各10人的比赛成绩如下表(单位：分)：）甲队成绩的中位数是分，乙队成绩的众数是分；（2）计算乙队的平均成绩和方差；（3）已知甲队成绩的方差是1.4 分2，则成绩较为整齐的是队．【参考答案】***试卷处理标记，请不要删除一、选择题1．B解析：B【分析】根据众数和中位数的定义求解即可．【详解】解：这组数据按从小到大顺序排列为：14，14，14，15，15，15，15，15，15，16，16，16，16，17，17，17，17，18，则众数为：15，中位数为：（15+16）÷2=15.5．故答案为B．【点睛】本题考查了众数和中位数的知识，属于基础题，解答本题的关键是掌握众数和中位数的定义．2．C解析：C【解析】根据数据x1，x2，…x n与数据x1+a，x2+a，…x n+a的方差相同这个结论即可解决问题.解：∵一组数据2，2，4，5，x的方差与另一组数据5，6，7，8，9的方差相等，∴这组数据可能是2，3，4，5，6或1，2，3，4，5，∴x=1或6，故选C.“点睛”本题考查方差、平均数等知识，解题的关键领域结论：数据x1，x2，…x n与数据x1+a，x2+a，…x n+a的方差相同解决问题，属于中考常考题型.3．B解析：B【分析】根据中位数的定义进行解答即可． 【详解】∵小亮同学想知道自己的体重在班级中是否属于中等水平， ∴需了解全班同学体重数据的中间的数据，即中位数， 故选：B ． 【点睛】本题主要考查统计的有关知识，中位数是一组数据中，最中间的数据；对统计量进行合理的选择和恰当的运用是解题关键．4．B解析：B 【详解】解：由题意知，新的一组数据的平均数=1n[（1x ﹣50）+（2x ﹣50+…+（n x ﹣50）]= 1n[（12x x ++…+n x ）﹣50n]=2， ∴1n（12x x ++…+n x ）﹣50=2， ∴1n（12x x ++…+n x ）=52， 即原来的一组数据的平均数为52． 故选B ．5．A解析：A 【解析】试题分析：根据平均数、方差的计算公式即可判断. 由题意得该数组的平均数改变，方差不变，故选A. 考点：本题考查的是平均数，方差点评：数学公式的计算与应用是初中数学学习中的一个基本能力，此类问题往往考查学生对数学公式的理解能力，难度不大.6．B解析：B 【分析】根据三角形的高、平均数、众数、中位数的定义、不等式的基本性质和邻补角的定义逐一判断即可． 【详解】①钝角三角形的三条高不相交（三条高所在的直线交于一点），故错误；②如果一组数据中有一个数据变动，那么它的平均数会随之变动，但众数和中位数不一定变动，故错误；③如果不等式()33m x m ->-的解集为1x <，可得m －3＜0，那么3m <，故正确；④如果三角形的一个外角等于与它相邻的一个内角，根据邻补角的定义可得这个外角和与它相邻的一个内角之和为180°， ∴三角形的这个内角为180°÷2=90° 则这个三角形是直角三角形，故正确． 综上：正确的有2个 故选B ． 【点睛】此题考查的是三角形的相关性质、定义、数据的平均数、众数、中位数的定义和不等式的基本性质，掌握三角形的相关性质、定义、数据的平均数、众数、中位数的定义和不等式的基本性质是解决此题的关键．7．C解析：C 【分析】根据频数分布直方图中的数据，求得众数，平均数，中位数，即可得出结论． 【详解】解：①根据频数分布直方图，可得众数为60−80元范围，故每人乘坐地铁的月均花费最集中的区域在60−80元范围内，故①不正确；②每人乘坐地铁的月均花费的平均数＝876001000=87.6＝87.6元，所以每人乘坐地铁的月均花费的平均数范围是80~100元，故②错误；③每人乘坐地铁的月均花费的中位数约为80元，在60~100元范围内，故③正确；④为了让市民享受到更多的优惠，若使50%左右的人获得折扣优惠，则乘坐地铁的月均花费达到80元以上的人可以享受折扣，故④正确． 故选：C 【点睛】本题主要考查了频数分布直方图，平均数以及中位数的应用，将一组数据按照从小到大（或从大到小）的顺序排列，如果数据的个数是奇数，则处于中间位置的数就是这组数据的中位数．如果这组数据的个数是偶数，则中间两个数据的平均数就是这组数据的中位数．8．D解析：D 【分析】先根据平均数的定义求出x ．这组数据中出现次数最多的数是众数． 【详解】∵x ，4，0，3，-1的平均数是1， ∴403115x +++-=⨯ ∴1x =-∴这组数据是14031--，，，， ∴众数是1-故选：D．【点睛】本题考查了平均数的定义和确定一组数据的众数的能力．要明确定义，找到这组数据中出现次数最多的数．9．D解析：D【分析】方差：一组数据中各数据与它们的平均数的差的平方的平均数，叫做这组数据的方差．【详解】依题意可得，平均数：45mx∴224441555m mm解得m=1，故选D．【点睛】本题考查了方差，熟练运用方差公式是解题的关键．10．B解析：B【分析】根据众数和中位数的概念求解可得．【详解】将数据重新排列为37，37，38，39，40，40，40所以这组数据的众数为40，中位数为39，故选B．【点睛】本题考查了中位数和众数的概念，一组数据中出现次数最多的数据叫做众数；将一组数据按照从小到大(或从大到小)的顺序排列，如果数据的个数是奇数，则处于中间位置的数就是这组数据的中位数；如果这组数据的个数是偶数，则中间两个数据的平均数就是这组数据的中位数．11．C解析：C【解析】【分析】方差是反映一组数据的波动大小的一个量．方差越大，则平均值的离散程度越大，稳定性也越小；反之，则它与其平均值的离散程度越小，稳定性越好，选出方差最小，而且平均数较大的同学参加数学比赛．【详解】∵3.6＜7.4＜8.1，∴甲和丙的最近几次数学考试成绩的方差最小，发挥稳定，∵95＞92，∴丙同学最近几次数学考试成绩的平均数高，∴要选择一名成绩好且发挥稳定的同学参加数学比赛，应该选择丙．故选C．【点睛】此题主要考查了方差的含义和求法，要熟练掌握，解答此题的关键是要明确：方差是反映一组数据的波动大小的一个量．方差越大，则平均值的离散程度越大，稳定性也越小；反之，则它与其平均值的离散程度越小，稳定性越好．12．C解析：C【解析】【分析】众数是一组数据中出现次数最多的数据，中位数是将一组数据按大小依次排列，把处在最中间位置的一个数据或者最中间两个数据的平均数叫这组数据的中位数．本组数据中，把数据按照从大到小的顺序排列，最中间的两个数的平均数即为中位数．【详解】由统计表可知：体育锻炼时间最多的是5小时，故众数是5小时；统计表中是按从小到大的顺序排列的，最中间两个人的锻炼时间都是5小时，故中位数是5小时．故选C．【点睛】本题考查了确定一组数据的众数和中位数的能力．将一组数据从小到大（或从大到小）重新排列后，最中间的那个数（最中间两个数的平均数），叫做这组数据的中位数．注意找中位数的时候一定要先排好顺序，然后再根据奇数和偶数个来确定中位数．如果数据有奇数个，则正中间的数字即为所求；如果是偶数，则找中间两位数的平均数．二、填空题13．925【分析】根据平均数与方差的定义计算即可得答案【详解】∵每名员工每天都比原先多生产1个零件∴现在日平均生产零件个数为=9设原先每人日生产零件的个数为：x1x2x3……x10∴原先的方差为=25∴解析：9 2.5【分析】根据平均数与方差的定义计算即可得答案．【详解】∵每名员工每天都比原先多生产1个零件，∴现在日平均生产零件个数为8101010⨯+=9， 设原先每人日生产零件的个数为：x 1、x 2、x 3、……x 10，∴原先的方差为22212101(8)(8)(8)10x x x ⎡⎤-+-+-⎣⎦…+=2.5， ∴现在的方差为22212101(19)(19)(19)10x x x ⎡⎤+-++-++-⎣⎦…+=22212101(8)(8)(8)10x x x ⎡⎤-+-+-⎣⎦…+=2.5， 故答案为：9，2.5【点睛】本题考查平均数与方差，熟练掌握定义与计算公式是解题关键．14．【分析】先分别求出甲乙的平均数再根据方差公式计算各自的方差进行比较即可得【详解】即故答案为【点睛】本题考查了方差的计算熟练掌握方差的计算公式是解题的关键解析：<【分析】先分别求出甲、乙的平均数，再根据方差公式计算各自的方差，进行比较即可得.【详解】87869823==63x +++++甲， 74795713==62x +++++乙， 222221232323238S =38769=633339⎡⎤⎛⎫⎛⎫⎛⎫⎛⎫⨯-+-+-+-⎢⎥ ⎪ ⎪ ⎪ ⎪⎝⎭⎝⎭⎝⎭⎝⎭⎢⎥⎣⎦甲， 2222211313131331S =37459=6222212⎡⎤⎛⎫⎛⎫⎛⎫⎛⎫⨯-+-+-+-⎢⎥ ⎪ ⎪ ⎪ ⎪⎝⎭⎝⎭⎝⎭⎝⎭⎢⎥⎣⎦乙， 831912<， 即22S S <甲乙，故答案为<．【点睛】本题考查了方差的计算，熟练掌握方差的计算公式是解题的关键.15．15或-05【分析】根据极差的概念求出x 的值然后根据平均数的概念求解【详解】一组数据-32-10123x 的极差是11当x 为最大值时x ﹣（﹣3）=11x=8平均数是：；当x 是最小值时3﹣x=11解得：解析：1.5或-0.5【分析】根据极差的概念求出x 的值，然后根据平均数的概念求解．【详解】一组数据-3, 2,-1,0,1,2,3,x 的极差是11，当x 为最大值时，x ﹣（﹣3）=11，x=8，平均数是：[3+ 2+1+0+1+2+3+8]8 1.5--÷=（） ；当x 是最小值时，3﹣x=11，解得：x=﹣8，平均数是：[3+ 2+1+0+1+2+3+(8)]80.5--÷=-（）-，故答案为：1.5或-0.5【点睛】本题考查了极差和平均数，掌握平均数是所有数据的和除以数据的个数；极差就是这组数中最大值与最小值的差，是解题的关键16．4【解析】试题解析：4【解析】试题∵x=0-（-1+0-2+1），解得x=2，故极差为：2-（-2）=4，则方差s 2=15[（-1-0）2+（2-0）2+（0-0）2+（1-0）2+（-2-0）2]=2，．17．【分析】根据平均数的计算公式可得再根据众数是5所以可得xy 中必须有一个5则另一个就是6通过方差的计算公式计算即可【详解】解：∵一组数据的平均数为6众数为5∴中至少有一个是5∵一组数据的平均数为6∴∴ 解析：83【分析】根据平均数的计算公式，可得11x y +=，再根据众数是5，所以可得x,y 中必须有一个5，则另一个就是6，通过方差的计算公式计算即可.【详解】解：∵一组数据4,,5,,7,9x y 的平均数为6，众数为5，∴,x y 中至少有一个是5，∵一组数据4,,5,,7,9x y 的平均数为6， ∴()4579166x y +++++=，∴11x y +=，∴,x y 中一个是5，另一个是6，∴这组数据的方差为()()()()()22222846256661[]676963-+-+-+-+-=； 故答案为83． 【点睛】 本题是一道数据统计中的综合性题目，涉及知识点较多，应当熟练掌握，特别是记忆方差的计算公式.18．5【解析】【分析】直接利用中位数定义求解【详解】第50个数和第55个数都是5所以这100名学生所植树棵数的中位数为5（棵）故答案为5【点睛】考查了中位数：将一组数据按照从小到大（或从大到小）的顺序排解析：5【解析】【分析】直接利用中位数定义求解．【详解】第50个数和第55个数都是5，所以这100名学生所植树棵数的中位数为5（棵）．故答案为5．【点睛】考查了中位数：将一组数据按照从小到大（或从大到小）的顺序排列，如果数据的个数是奇数，则处于中间位置的数就是这组数据的中位数．如果这组数据的个数是偶数，则中间两个数据的平均数就是这组数据的中位数．19．3【解析】【分析】由中位数及众数的定义和给定的条件求出xy 的值然后根据平均数的定义求出平均数即可；利用方差公式计算即可求出方差【详解】由一组数据12xy46的中位数是25众数是2则有x=2y=3∴这解析：3 83【解析】【分析】由中位数及众数的定义和给定的条件求出x ，y 的值，然后根据平均数的定义求出平均数即可；利用方差公式计算即可求出方差.【详解】由一组数据1，2，x ，y ，4，6的中位数是2.5，众数是2，则有x=2，y=3，,∴这组数据的平均数为：12234636+++++=.∴这组数据的平均数为3； 这组数据的方差为：22222218(13)(23)(23)(33)(43)(63)63⎡⎤-+-+-+-+-+-=⎣⎦. ∴这组数据的方差为83. 故答案为3；83. 【点睛】本题考查数据的平均数、中数、方差，掌握平均数、中数、方差的的定义是解题的关键. 20．55【解析】【分析】根据众数和平均数的定义求解【详解】解：5出现了三次出现次数最多所以这组数据的众数是5这组数据的平均数=（5+45+5+55+55+5+45）=5故答案为：5；5【点睛】本题考查平解析：5 5【解析】【分析】根据众数和平均数的定义求解．【详解】解：5出现了三次，出现次数最多，所以这组数据的众数是5，这组数据的平均数=17（5+4.5+5+5.5+5.5+5+4.5）=5． 故答案为：5；5.【点睛】本题考查平均数的求法以及众数的定义：一组数据中出现次数最多的数据叫做众数． 三、解答题21．（1）①补图见解析；②这30户家庭2018年4月份义务植树数量的平均数是3.4棵，中位数是3棵；（2）估计该小区采用这种形式的家庭有70户．【分析】（1）①由已知数据知3棵的有12人、4棵的有8人，据此补全图形可得；②根据平均数和众数的定义求解可得；（2）用总户数乘以样本中采用了网上预约义务植树这种方式的户数所占比例可得．【详解】（1）①由已知数据知3棵的有12人、4棵的有8人，补全图形如下：②这30户家庭2018年4月份义务植树数量的平均数是1223312485461 3.430⨯+⨯+⨯+⨯+⨯+⨯=（棵） 中位数：从小到大排列，中位数应为第15位和第16位的数的平均值：3332+=（棵） 答：这30户家庭2018年4月份义务植树数量的平均数是3.4棵，中位数是3棵． （2）估计该小区采用这种形式的家庭有300×730=70户， 答：估计该小区采用这种形式的家庭有70户．【点睛】 本题主要考查了频数分布直方图，中位数、平均数的定义及样本估计总体思想的运用．读懂统计图，从统计图中得到必要的信息是解决问题的关键．条形统计图能清楚地表示出每个项目的数据．22．（1）40；（2）30元，50元；（3）50500元．【分析】（1）根据条形统计图的信息把计划购买课外书的不同费用的人数相加计算即可； （2）根据众数的定义，中位数的定义，逐一进行求解即可；（3）先根据条形统计图展现的数据，计算样本中每个学生平均花费，再用全校总人数×每个学生平均花费，即可估算全校购买课外书的总花费．【详解】解：（1）6121084=40++++（2）购买30元课外书的人数最多，所以这次抽样的众数是30元；购买课外书排第20，第21的费用均为50元，所以这次抽样的中位数是50元； （3）样本中平均每个学生的费用是620123010508804100=50.56121084⨯+⨯+⨯+⨯+⨯++++（元） 因此该校1000学生购买课外书的总花费约为100050.5=50500⨯（元）答：该校本学期计划购买课外书的总花费约为50500元．【点睛】本题主要考查抽样调查中样本容量，众数，中位数的定义及由样本数据估算总体数量的知识．23．（1）50，32；（2）16，15；（3）768.【分析】（1）根据题意由5元的人数及其所占百分比可得抽样调查的学生人数，用10元人数除以抽样调查的学生人数可得m 的值；（2）由题意根据统计图可以分别得到本次调查获取的样本数据的平均数和中位数；（3）由题意根据全校总人数捐款金额为10元的学生人数所占乘以抽样调查的学生人数的比例，即可估计该校本次活动捐款金额为10元的学生人数．【详解】解：（1）本次接受随机抽样调查的学生人数为4÷8%=50人， ∵16100%32%50⨯=， 32m ∴=.故答案为：50；32.（2）本次调查获取的样本数据的平均数是：451610121510208301650⨯+⨯+⨯+⨯+⨯=（元）； 本次调查获取的样本数据的中位数是：15元.（3）估计该校本次活动捐款金额为10元的学生人数为2400×32%=768人．【点睛】本题考查条形统计图和扇形统计图、用样本估计总体、平均数、中位数，解题的关键是明确题意，找出所求问题需要的条件．24．（1）50；28；（2）12，11；（3）八年级模拟体测中得12分的学生约有256人．【分析】（1）根据得8分的学生人数和所占的百分比可以求得本次调查的人数，然后根据扇形统计图中的数据可以求得m 的值；（2）根据统计图中的数据可以求得本次调查获取的样本数据的众数和中位数；（3）根据统计图中的数据可以计算出我校九年级模拟模拟体测中得12分的学生约有多少人．【详解】：（1）本次抽取到的学生人数为：4÷8%=50，m%=1-8%-10%-22%-32%=28%，故答案为：50，28；（2）本次调查获取的样本数据的众数是12分，中位数是11分；（3）800×32%=256人；答：八年级模拟体测中得12分的学生约有256人；【点睛】此题考查扇形统计图、条形统计图、用样本估计总体、中位数、众数，解题的关键是明确题意，利用数形结合的思想解答．25．（1）甲、乙六次测试成绩的方差分别是223S =甲，243S =乙；（2）甲【分析】（1）根据方差的定义，利用方差公式分别求出甲、乙的方差即可；（2）根据平均数相同，利用（1）所求方差比较，方差小的成绩稳定，即可得答案．【详解】（1）甲、乙六次测试成绩的方差分别是： (222222212[(109)(99)(89)(89)(109)99)63S ⎤=⨯-+-+-+-+-+-=⎦甲， (222222214[(109)(109)(89)(109)(79)99)63S ⎤=⨯-+-+-+-+-+-=⎦乙， （2）推荐甲参加全国比赛更合适，理由如下：∵两人的平均成绩相等，∴两人实力相当；∵甲的六次测试成绩的方差比乙小，∴甲发挥较为稳定，∴推荐甲参加比赛更合适．故答案为：甲【点睛】 本题考查方差的求法及利用方差做决策，方差反映了一组数据的波动大小，方差越大，波动性越大，反之也成立；熟练掌握方差公式是解题关键．26．（1）9.5，10；（2）9分，1分2；（3）乙【分析】（1）根据中位数的定义求出最中间两个数的平均数；根据众数的定义找出出现次数最多的数即可；（2）先求出乙队的平均成绩，再根据方差公式进行计算；（3）先比较出甲队和乙队的方差，再根据方差的意义即可得出答案．【详解】（1）把甲队的成绩从小到大排列为：7，7，8，9，9，10，10，10，10，10，最中间两个数的平均数是（9+10）÷2=9.5（分），则中位数是9.5分；乙队成绩中10出现了4次，出现的次数最多，则乙队成绩的众数是10分；故答案为：9.5，10；（2）乙队的平均成绩是：()104827939110⨯+⨯++⨯=⨯（分）， 则方差是：()()()()22224109211089793991⎡⎤⨯-+⨯-+-+⨯-=⎣⎦⨯（分2） ； （3）∵甲队成绩的方差是1.4，乙队成绩的方差是1，∴成绩较为整齐的是乙队；故答案为：乙．【点睛】本题考查方差、中位数和众数：中位数是将一组数据从小到大（或从大到小）重新排列后，最中间的那个数（或最中间两个数的平均数），一般地设n 个数据x 1，x 2，…x n 的平均数为x ，则方差S 2=()()()()22221231n x x x x x x x x n ⎡⎤-+-+-++-⎣⎦，它反映了一组数据的波动大小，方差越大，波动性越大．。
2020—2021学年部编版语文八年级下册第五单元测试题
人教版八年级下册语文第五单元章节练习（附答案）一、选择题1.下列加线字的注音,不完全正确的一项是（）A．棱角(líng)黧黑(lí) 冻疮(chuāng)B．虔诚(qián)蠕动(rú)腈纶(jīnɡ)C．骤然(zhòu) 漫溢(yì) 懈怠(dài)D．敦实(dūn) 蜿蜒(yán) 演绎(yì)2.下列句子中，标点符号运用正确的一项是()A．阳光使这位身披白色披风的巨人变化多端：融雪处裸露出大山黧黑的骨骼，有如刀削一般，棱角与层次毕现，富有雕塑感。
B．头痛、恶心、双脚绵软、呼吸困难——典型的缺氧反应，外加新伤剧痛。
C．冰体一点一点地改变了形态，变成自然力所能刻画成的最漂亮的这番模样。
挺拔的，敦实的，奇形怪状的，蜿蜒而立的。
D．那些冰塔、冰柱、冰洞、冰廊、冰壁上徐徐垂挂冰的流苏、像长发披肩。
3.下面这段文字中，画横线处填入的句子，与原文衔接紧密的一项是( )大激店村位于古城保定偏西南二十五公里处，________。
沿途三里一墩五里一铺，又是当时通讯要镇、保定府西第一驿站。
________，在靠河湾北岸，形成了一个四面环水、风景秀丽的自然村庄。
________。
________。
后人因妲己二字不吉利(败坏朝纲)，而改名大激店。
烽火台、狐狸窝、瓦渣地等旧遗址，也早都不存在了。
①相传商纣王选妃，选中蓟州侯苏获之女妲己②发源于西部山区的百草沟河流经此地③在护送妲己去朝歌途中曾在此地驿宿一夜，故而得名妲己店④古有南通九省，北贯京都的交通大道穿境而过A．②①④③B．④②①③C．②④①③D．②③④①4.下面语句中，依次填入的词语最恰当的一项是（）兰州人对黄河奇石的喜爱体现了崇尚自然的审美观念。
中国古人认为，奇石是天人合一的产物，它、，妙在。
A．千姿百态浑然天成栩栩如生B．栩栩如生千姿百态浑然天成C．栩栩如生浑然天成千姿百态D．千姿百态栩栩如生浑然天成二、语言表达5.请根据语境，再仿写一句话。
人教版八年级下册英语 Unit 5单元测试卷(含答案)
Unit 5 单元测试卷一、单项选择( ) 1. I saw the teacher come in________a few books under his arm.A. toB. forC. withD. and( ) 2. -Hi, I can’t find my history book. Have you seen it________?-Sorry, I haven’t. Why don’t you ask Jim? Perhaps he’s seen it.A. somewhereB. everywhereC. nowhereD. anywhere ( ) 3. -I’ll be away for a long time.-Don’t worry. She can look after your pet________.A. careful enoughB. enough carefulC. carefully enoughD. enough carefully( ) 4. -Why do you think Old Henry is a(n)________man?-He wears a thick coat in summer.A. strangeB. talentedC. blindD. independent( ) 5. How________it rained yesterday! We had to cancel our football match.A. heavilyB. lightC. heavyD. lightly( ) 6. As we all know, the sun________in the east and sets in the west.A. travelsB. liftsC. raisesD. rises( ) 7. Frank believes in himself. He thinks nobody else can________him.A. winB. beatC. hitD. knock( ) 8. Can you help me________the pen? It’s under your chair.A. ask forB. look forC. pick upD. put up( ) 9. Love your parents________they are alive. Don’t wait until it is too late.A. whileB. thoughC. becauseD. unless( ) 10. -Did you notice a man passing by?-No. I________on the phone.A. talkB. am talkingC. was talkingD. talked二、完形填空A man was sitting in the doctor's office. He was telling the doctor about his____1____.“I like football, doctor,” he said. “Please help me. My life has____2____been a good one since I became____3____in football and it is getting worse and worse.I can’t even ____4____well at night. When I close my____5____, I’m out there in the football field____6____after a flying ball. When I wake up, I’m more____7____than I was when I went to bed. What should I do? Can you give me some____8____?”The doctor sat back and said, “First of all, you have to do your best not to dream about football.Before you fall____9____, try to think about something else. Try to think that you are at a party and someone is going to give you several million dollars.””Are you crazy?” the man shouted. “I’ll____10____the ball!”( ) 1. A. trip B. family C. sport D. problem( ) 2. A. ever B. never C. already D. often( ) 3. A. angry B. excited C. interested D. sad( ) 4. A. sleep B. play C. see D. work( ) 5. A. rooms B. windows C. books D. eyes( ) 6. A. looking B. running C. playing D. waiting( ) 7. A. surprised B. worried C. tired D. pleased( ) 8. A. advice B. hope C. money D. medicine ( ) 9. A. down B. over C. off D. asleep( ) 10. A. miss B. play C. catch D. pass三、阅读理解On a bright autumn night, my friend David and I were watching meteors in the yard. We saw a large triangular thing flying across the sky. It was traveling from south to north. It seemed to have orange light. It only took about 5 to 8 seconds for the thing to travel across the sky and disappear. The most amazing thing was that it was very quiet when it traveled. We live near the airport and often hear the sound of planes. However, this one was really quiet. We were both surprised and we began to describe it to my father. What we said about the strange thing was the same. Then we went into the house and drew what we saw. We believed that someone must be looking at the sky at that time and see what happened.( ) 1. What were they doing on a bright autumn night?A. They were walking down the street.B. They were drawing in the house.C. They were watching meteors.D. They were sleeping in the yard.( ) 2. They were surprised because________.A. the thing was very largeB. there was no sound when the thing traveledC. the thing could flyD. the thing was bright( ) 3. Where does the writer live?A. At schoolB. Near the lake.C. Near the park.D. Near the airport.( ) 4. What does the underlined word “disappear” mean in Chinese?A. 出现B. 消失C. 存在D. 飞行( ) 5. From the passage we can learn that________.A. they often see planes in the skyB. the writer didn’t see the strange thingC. no one was watching the sky that nightD. they can see meteors in the sky every night四、根据首字母提示填写单词1. The l________in the room was too weak. We couldn’t see things clearly.2. Have you seen our plan? Are you for or a________it?3. -I hope you can tell us the t________of the event.-Sure. What I said is true.4. He fell down many times because the road was i________after the heavy snow.5. The car in front of mine came to a stop s________and my car hit it.五、按要求改写下列句子，每空一词1. David was walking in the street when it began to rain.(对画线部分提问)________ ________David________when it began to rain?2. Sally washed her clothes at home yesterday.(用at this time yesterday改写句子)Sally________ ________her clothes at home at this time yesterday.3. We couldn’t drive on because there was a heavy rain.(改为简单句)We couldn’t drive on________ ________a heavy rain.4. The girl didn’t want to eat anything.(改为同义句)The girl didn’t________ ________eating anything.5. They were so scared that they could hardly think clearly.(改为同义句)They were________scared________think clearly.六、根据汉语提示完成句子，每空一词1. 风正在慢慢变小。
(最新)部编人教版历史八年级下册《第五单元国防建设与外交成就》综合检测试题(含答案解析)
八年级下第五单元单元测试卷一、选择题1．（3分）假如你回到了1954年，作为一名记者为报社写一篇关于我国第一部宪法通过的社论．以下题目你选择的是（）A．向社会主义工业化迈进B．谁是最可爱的人C．人民民主法制建设的新阶段D．农民成为土地主人2．（3分）20世纪中期，五星红旗第一次在联合国总部升起，有位美国驻联合国代表感慨地说“这是联合国历史上的转折点．”这个“转折点”是指（）A．中美关系缓和B．中华人民共和国在联合国的合法席位恢复C．中美正是建交D．中国代表团出席日内瓦会议3．（3分）新中国成立后相继建立的海军舰队不包括（）A．北海舰队的建立B．东海舰队的建立C．南海舰队的建立D．西海舰队的建立4．（3分）我国导弹部队组建于20世纪（）A．50年代B．60年代C．70年代D．80年代5．（3分）中国政府首次提出和平共处五项原则是在哪次双边谈判中（）A．中印谈判B．中缅谈判C．中苏谈判D．中美谈判6．（3分）“遏制敌人对中国使用核武器，在敌人对中国发动核袭击时……对敌人实施有效的自卫反击，打击敌人的重要目标。
”新中国担任这一使命的部队名称是（）A．海军陆战队B．陆军特种部队C．第二炮兵部队D．武装警察部队7．（3分）2001年是中国加强与周边国家合作，积极融入全球化的重要年份。
以下史实发生在2001年的是：（）①上海亚太经合组织会议的召开②和平共处五项原则的提出③我国加入世贸组织④田中角荣访华，中日建交。
A．①②B．①②④C．①③D．①②③④8．（3分）网络学习是现代教育的重要手段。
小明在百度搜索中输入的关键词是“70年代中国外交的突破性进展”。
下列选项中最有可能出现的是（）A．提出“求同存异”的方针B．中美关系正常化C．提出和平共处五项原则D．加入“亚太经合组织”9．（3分）新华网北京2012年2月24日电，大型电视纪录片《暖流》日前在山东淄博市博山区源泉镇裕禄学校开机拍摄，《暖流》将以“不忘历史、继往开来、化解恩怨、世代友好”为主题，重在讲述两国关系斗则衰、和则荣的历史与现实，以期增进中日两国人民之间的理解和信任．今年是中日建交（）A．40周年B．41周年C．42周年D．33周年10．（3分）外交是智者的游戏，外交是妥协的艺术．20世纪50年代，中国政府提出“求同存异”的方针，促进了一次国际会议的圆满结束．这次会议是（）A．第26届联合国大会B．中印关于西藏地区的谈判C．亚太经合组织会峰会D．万隆会议11．（3分）这足一张珍贵的历史图片，图片中乔冠华开怀大笑的原因是（）A．印度和缅甸接受中国提出的和平共处五项原B．田中角荣访华，中日邦交开始正常化C．联合国大会恢复中华人民共和国在联合国的合法席位D．尼克松访华，中美关系开始走向正常化12．（3分）制定出我国有史以来真正反映人民利益的第一部社会主义类型宪法的会议是（）A．中国共产党第七次全国代表大会B．第一届全国人民代表大会C．中国人民政治协商会议第一届全体会议D．中共十一届三中全会13．（3分）1954年6月，周恩来总理访问印度和缅甸时提出的（）五项原则，成为解决国与国之间关系的基本准则，是新中国外交政策成熟的标志．A．求同存异B．独立自主C．睦邻友好D．和平共处14．（3分）亚太经合组织会议于2001年在上海举办，夏季奥运会2008年在北京举办，G20峰会将于2016年8月在杭州举行……中国之所以能承办这些大型国际会议，其根本原因是（）A．上海、北京等城市形象良好，是著名的国际大都市B．中国社会主义现代化建设的迅速发展和综合国力的提高C．中国是亚太乃至世界人口最多、市场潜力最大的国家D．开放的中国、古老的文明吸引着各国领导人15．（3分）提出“求同存异”的方针，促进中国与亚非各国团结与合作的会议是（）A．万隆会议B．日内瓦会议C．第26届联大D．上海APEC会议二、综合探究题16．全面推进依法治国，建设中国特色社会主义法治体系，建设社会主义法治国家。
人教版八年级英语下册第5-6单元单元测试试题(有答案)
人教版八年级下册第5-6单元检测题一、方格里的词你还记得吗？请你在下面找出它们的意思，并把字母编号写在对应的答题卡上。
（本大题共10小题，每小题1分，满分10分）A. stormB.sillyC. strange D passage E. cheatF .shine G. brave H. shoot I. icy J. couple()1.unusual or unexpected, and makes you feel slightly nervous or afraid()2.gives out bright light.()3. very bad weather, with heavy rain, strong winds, and often thunder and lightning()4. does not show fear in difficult or dangerous situations()5.foolish, childish, or ridiculous()6. do not obey a set of rules, deprive somebody of something by deceit()7. a section of text;a way through or along which someone or something may pass()8. a pair of people who live together()9. Very cold, has ice on it()10. fire a bullet from a weapon such as a gun二、单项选择（本大题共15小题，每小题1分，满分15分）从每小题所给的A、B、C、D四个选项中选出一个可以填入空白处的最佳选项。
()1. 1. Long long ago, there was _________emperor in _________Europe.A. a, aB. an, anC. a, /D. an, /()2.The news on TV ____ that the ISIS terrorists killed at least 129 people in Paris.A．reported B．realized C．returned D．refused()3. ---Will you please tell her about the news?---Sure, I’ll tell her about it as soon as she __________ back.A. comeB. will comeC. cameD. comes()4．When we went in，we saw Tina sitting on the floor ____ the wall and crying alone.A．about B．over C．against D．with()5．_______ we came back to school, Dale was playing the violin.A. WhenB. WhileC. UntilD. After()6．I was late for school because my alarm didn't ____．A．go off B．go out C．go back D．go away()7. The old photo reminds me __________ my childhood.A. forB. withC. toD. of()8. We are trying to ________our country ________a more beautiful country.A. compare, withB. compare, toC. turn, intoD. look, after()9. We were so ________by the girl’s s tory that we couldn`t stop ________.A. move, to cryB. move, cryingC. moved, to cryD. moved, crying()10．You dropped the litter here. Would you mind ____？A．to pick up B．picking it up C．to pick it up D．picking up it()11. Tom won't go to the zoo tomorrow unless he _______homework this afternoon.A. finishB. finishingC. finishesD. will finish()12．When I walked past the classroom，I saw some students ____ in it.A．read B．reading C．to read D．to reading()13. They went to Shanghai ________the first time ________October, 2002.A. at, inB. at, onC. for, inD. for, on()14.---- Could you please tell me ________?-----They’re over there.A. where are the restroomsB. where were the restroomsC. where the restrooms areD. where the restrooms were()15. I think Song Zuying has a good __________. I like her songs.A. soundB. voiceC. noiseD. news三、完形填空（本大题共10小题，每小题1分，满分10分）阅读下面短文，掌握其大意，然后从各小题所给的四个选项中，选出最佳选项。
人教版八年级英语下册第五单元测试及答案
人教版八年级英语下册第五单元测试限时：60分钟满分：100分一、单项选择(每小题1分，共15分)1. I heard a(n)________ noise just now. It made me scared.A. beautifulB. typicalC. strangeD. interesting2. The pupil was so tired that he________ at his desk.A. fell asleepB. woke upC. got upD. went to bed3. At times, we need to stay________ and think about something carefully.A. in factB. in dangerC. in commonD. in silence4. I didn't understand what my teacher said________, but later I got it.A. at lastB. at firstC. at leastD. in fact5. When his name was called, I saw him________ from his seat.A. roseB. raiseC. raisedD. rise6. This afternoon, on the way home he found some money on the ground and________.A. pick them upB. picked up itC. picked it upD. picked up them7. I got up late on Friday morning because the alarm didn't________.A. put offB. take offC. turn offD. go off8. One of the opinions________ smoking is that it is harmful to people's health.A. forB. againstC. atD. in9. Lucy has made great progress in Chinese________.A. recentlyB. hardlyC. probablyD. nearly10. We should________ how important health is to us before it's too late.A. supposeB. expectC. realizeD. cause11. His job is to________ that drivers obey(服从) the traffic rules.A. make plansB. find outC. think ofD. make sure12. Pass me the glasses, Tony. I can________ watch TV clearly.A. hardlyB. reallyC. ratherD. clearly13. We soon________ the mountains.A. made our ways toB. made way toC. made us way toD. made our way to14. —Could you tell me where you found Miss Gao just now?—Certainly. In the principal's office. They________ happily at that time.A. are talkingB. have talkedC. were talkingD. talked15. —I called you at 5：00 yesterday afternoon, but no one answered.—Sorry. I ________ football with my friends at that time.A. playB. playedC. will playD. was playing二、完形填空(每小题1.5分，共15分)It was a Friday evening. I was waiting at the bus stop after school when a car stopped and the driver opened the door. It was my ________16.“Quick, get in！” he told me. I was very ________17, but I did as he said.At first, I was worried that something ________18happened.Then, I noticed my mother. She was also ________19the car and on the back seat. There were some bags of clothes and ________20food. My father was driving the car, but he was not driving ________21.He was driving out of the town. “Where are we going？” I asked.It was a warm evening and lots of people were walking along the road. It was the ________22day of the term. Did my parents have a big surprise for me? We were going somewhere special—________23where? The next thing I can remember is falling ________24. When I woke up, I saw the sea. We were at the beach. My father was smiling. “Here we are, ” he said. “The summer holiday ________25 now！”16. A. father B. mother C. brother D. sister17. A. sad B. surprised C. Excited D. glad18. A. good B. important C. interesting D. bad19. A. in B. on C. by D. at20. A. many B. no C. some D. few21. A. abroad B. home C. there D. here22. A. first B. one C. worst D. last23. A. or B. for C. but D. and24. A. asleep B. ill C. silent D. quiet25. A. started B. starts C. ended D. ends三、阅读理解(每小题2分，共10分)Mahalya is a student in Grade 8 at Lamberton Middle School in Pennsylvania, US. Every afternoon at 2 o'clock, she runs to a store at her school. She is not running to buy snacks. Instead, she works as the storekeeper and helps count change (零钱) for customers.“I didn't know that it took so much work. I didn't do anything like this, ” Mahalya told The Seaeinel, a local newspaper.In fact, she and another 11 students work as the storekeepers at Bison Bargains, the school's first student－run store. It started on February 22, and it opens each school day during break time from 2 to 2：30 p. m. It mainly sells stationery and snacks.Through this, students see what a business is like. Christian, a 14－year－old student, was really surprised by how hard it was to avoid making mistakes and do the transactions (交易). “It's a kind of challenge to learn all the information on the stock (供应物) lists and remember all the prices of the products, ” Christian told the newspaper.To help them learn about business, they took a class. The class taught students how to usemoney and some simple business rules.The school did a survey on what products students would buy from a school store. In the future, they plan to sell things made by the students themselves. For example, students can sell their homemade pencil boxes and phone cases.26. Mahalya runs to a store in her school to________ .A. buy some snacksB. learn about customersC. work as the storekeeperD. learn about the information27. What does the underlined word “stationery” mean in Chinese?A. 文具B. 餐具C. 道具D. 家具28. How long does Bison Bargains open each school day during break time?A. 60 minutes.B. 50 minutes.C. 40 minutes.D. 30 minutes.29. The purpose of having a student－run store is to________.A. teach students to learn from mistakesB. help students see what a business is likeC. sell more stationery and snacks to studentsD. start a class on how to use money in the store30. What is this passage mainly about?A. The school's new program, a student－run store.B. The results of a survey on the student－run store.C. The reasons of opening a student－run store.D. The rule of the studentrun store.四、任务型阅读(每小题2分，共10分)It was raining heavily while I was walking up the hill towards the station at six o'clock on Saturday morning. At this early hour there wasn't much traffic and there weren't many people. While I was crossing the road near the top of the hill, a car came round the corner.①It was traveling very fast. Suddenly it hit a lamp post(柱) and turned over.I ran to the car________(help) the driver at once. He was badly hurt and there was lots of blood on his face. A young woman hurried into the station and phoned for an ambulance(救护车) when I took care of②the driver. Some people came to see what happened, and there was nothing we could do. A policeman arrived a few minutes later and asked me lots of questions about the accident. Then the ambulance arrived and took the driver to the hospital.On Monday morning I went to the hospital to see the man. The doctor told me that he was much better and that he would leave hospital after a few days' rest.任务一：根据短文内容，回答问题。
2020-2021学年 人教版八年级英语下册 Unit 5 单元测试(含答案)
人教版八年级英语下册Unit5 单元测试姓名：__________ 班级：__________ 学号：__________一、单选题（共10题；共20分）1.We were reading the newspaper _______ suddenly the light went out (熄灭).A.whenB.whileC.asD./2.What _________ when the earthquake happened on May 12th?A.are you doingB.were you doingC.do you doD.did you do3.Do you remember ________ when the car accident happened?A.what you were doingB.what were you doingC.what you didD.what did you do4.Jane was not at home at that time and her parents weren't ．A.tooB.eitherC.alsoD.neither5.It's very cold in Harbin．Snowing in October is nothing there．A.strangeefulC.traditionalD.natural6.一Who the singing competition?一I heard Joe Jill in the competition．A.won；wonB.beat；wonC.won；beatD.beat；beat7.—Why did they the houses?—Because they will build a park there．A.take downB.write downC.cut downD.turn down8.一I heard Frank would join the music club．一He's not interested in music at all．A.Why not?B.No problem．C.You’re kidding!D.It\s up to you．9.—When did the classroom have a power cut?—This morning, while we ________ a physics lesson.A.have hadB.were havingC.are havingD.will have10.—David, I'm going to drive all the way to Tibet from Wuhan by myself.—What? ________！A.No problemB.Good ideaC.Have a good timeD.You're kidding二、完形填空（共10分）On a cold January day, Jimmy and his father were skating on a lake.Suddenly the ice near Jimmy1 ,and he felt into the cold water.Jimmy's father jumped into the water, but he couldn't find Jimmy.Severalminutes passed.The father 2 couldn't‘find Jimmy.Some firemen(消防队员)arrived.Twenty minutes later they found Jimmy and got 3 out of the water.Jimmy was not breathing, and his heart was not beating.The situation seemed 4 .However, the firemen didn’t give up and still did CPR(心肺复苏) on Jimmy.Luckily, Jimmy began to breathe，and his heart began to beat.He was taken to the hospital at once.After six weeks in the hospital Jimmy got 5 .He began to walk.talk and play again.Jimmy was in the water 6 more than 20 minutes.He couldn't breathe in the water. 7 today he is alive(活着)and healthy.How is that possible? That's because the water was ice.cold.When it's really cold, the brain(大脑)slows down.It does not 8 much oxygen(氧气).Jimmy's father believes there is another 9 .He says，“Jimmy is alive today because he is a10 little boy.”1. A. 10st B. broke C. left D. grew2. A. still B. even C. almost D. never3. A. he B. him C. they D. them4. A. true B. free C. hopeless D. meaningless5. A. older B. younger C. better D. worse6. A. of B. for C. like D. with7. A. If B. So C. But D. Unless8. A. need B. bring C. feel D. share9. A. example B. symbol C. reason D. prediction10. A. serious B. quiet C. careful D. strong三、阅读理解（共2题；共30分）AOnce there lived an old man in a town. He always forgot a lot of things. So his wife always had to say to him, “Don't forget this.” One day he went for a long trip by train alone. Before he left home, his wife said, “Now you have all these things that you need on your way. Take care of your things on the way.” He went to the station. He bought a ticket and got on the train with it. About an hour later, the conductor (列车员) began to see the tickets. He came to the old man and said，“Will you please show me your ticket?” The old man looked for his ticket in all his pockets but he could not find it. He was very worried. “I can't find my ticket. I really bought a ticket before I got on the train, ”said the old man. “I think you are right. I believe you bought a ticket. All right, you don't haveto buy another ticket,” said the conductor kindly. But the old man still looked worried and said sadly, You don't know why I'm worried. If I don't find my ticket, I can't remember my station. Where am I going?”根据短文内容判断正误。
最新人教版初中数学八年级数学下册第五单元《数据的分析》测试题(含答案解析)(1)
一、选择题1．为评估一种农作物的种植效果，选了8块地作试验田，这8块地的亩产量（单位：kg ）分别为1x ，2x ，…，8x ，下面给出的指标中可以用来评估这种农作物亩产量稳定程度的是（ ）A ．1x ，2x ，…，8x 的平均数B ．1x ，2x ，…，8x 的方差C ．1x ，2x ，…，8x 的中位数D ．1x ，2x ，…，8x 的众数2．在5轮“中国汉字听写大赛”选拔赛中，甲、乙两位同学的平均分都是90分，甲的成绩方差是15，乙的成绩的方差是3，下列说法正确的是（ ） A ．甲的成绩比乙的成绩稳定 B ．乙的成绩比甲的成绩稳定 C ．甲、乙两人的成绩一样稳定D ．无法确定甲、乙的成绩谁更稳定3．某校篮球队10名队员的年龄情况如下，则篮球队队员年龄的众数和中位数分别是( ) 年龄 13 14 15 16 人数2341A ．15，15B ．14，15C ．14，14.5D ．15，14.54．下列说法正确的是（ ）A ．为了解我国中学生课外阅读的情况，应采取全面调查的方式B ．一组数据1、2、5、5、5、3、3的中位数和众数都是5C ．若甲组数据的方差是003，乙组数据的方差是0.1，则甲组数据比乙组数据稳定D ．抛掷一枚硬币100次，一定有50次“正面朝上”5．在学校举行的“我为祖国献首歌”的合唱比赛中，六位评委给初三某班的评分分别是：87、90、83、87、87、83，这组数据的众数和中位数分别是（ ） A ．87，87B ．87，85C ．83，87D ．83，856．某兴趣小组为了解我市气温变化情况，记录了今年1月份连续6天的最低气温（单位：C ）：－6，－4，－2，0，－2，2.关于这组数据，下列结论不正确的是（ ）A ．平均数是－2B ．中位数是－2C ．众数是－2D ．方差是57．某班七个兴趣小组人数如下：5，6，6，x ，7，8，9，已知这组数据的平均数是7，则这组数据的中位数是( ) A ．6B ．6.5C ．7D ．88．甲、乙两人各射击次，甲所中的环数是，，，，，，且甲所中的环数的平均数是，众数是；乙所中的环数的平均数是，方差是4.根据以上数据，对甲，乙射击成绩的正确判断是（ ） A ．甲射击成绩比乙稳定 B ．乙射击成绩比甲稳定C ．甲，乙射击成绩稳定性相同D ．甲、乙射击成绩稳定性无法比较9．某校九年级模拟考试中，1班的六名学生的数学成绩如下：96，108，102，110，108，82．下列关于这组数据的描述不正确的是（ ） A ．众数是108 B ．中位数是105 C ．平均数是101D ．方差是9310．实施新课改以来，某班学生经常采用“小组合作学习”的方式进行学习，值周班长小兵每周对各小组合作学习的情况进行综合评分，下表是其中一周的评分结果“分值”这组数据的中位数和众数分别是( ) A ．89,90B ．90,90C ．88,95D ．90,9511．下面的统计图表示某体校射击队甲、乙两名队员射击比赛的成绩，根据统计图中的信息，下列结论正确的是（ ）A ．甲队员成绩的平均数比乙队员的大B ．乙队员成绩的平均数比甲队员的大C ．甲队员成绩的中位数比乙队员的大D ．甲队员成绩的方差比乙队员的大12．为了解某小区“全民健身”活动的开展情况，随机对居住在该小区的40名居民一周的体育锻炼时间进行了统计，结果如下表： 锻炼时间（时） 3 4 5 6 7 人数（人）6131452这40名居民一周体育锻炼时间的众数和中位数是( ) A ．14,5B ．14,6C ．5,5D ．5,6第II 卷（非选择题）请点击修改第II 卷的文字说明参考答案二、填空题13．已知一组数据a ，b ，c 的方差为2，那么数据3a +，3b +，3+c 的方差是________．14．一组数据1x ，2x ，3x ，4x ，5x 的平均数是5，方差是3，则143x -，243x -，343x -，443x -，543x -的平均数是________，方差是________．15．若这8个数据-3, 2,-1,0,1,2,3,x 的极差是11,则这组数据的平均数是______.16．随着移动互联网的快速发展，基于互联网的共享单车应运而生．为了解某单位使用共享单车的情况，该单位有200名员工，某研究小组随机采访10位员工，得到这10位员工一周内使用共享单车的次数分别为：17，12，15，20，17，0，7，26，17，9． （1）这组数据的中位数是 ，众数是（2）试用平均数估计该单位员工一周内使用共享单车的总次数．17．在一次数学测验中，甲组4名同学的平均成绩是70分，乙组6名同学的平均成绩是80分，则这10名同学的平均成绩是______________.18．甲、乙二人在相同情况下，各射靶10次，两人命中环数的平均数都是7，方差2S 甲=2.8，2S 乙=1.5，则射击成绩较稳定的是______．（填“甲”或“乙”）19．已知一组数据为：5，3，3，6，3则这组数据的方差是______．20．若样本数据1，2，3，2的平均数是a ，中位数是b ，众数是c ，则数据a ，b ，c 的方差是___．三、解答题21．在推进杭州市城乡生活垃圾分类的行动中，某校为了考察该校初中生掌握垃圾分类知识的情况，进行了一次测试，并随机抽取了若干名学生的测试成绩进行整理，绘制了如图所示不完整的频数直方图（每组含前一个边界值，不含后一个边界值）和扇形统计图． （1）求样本容量，并补充完整频数直方图．（2）在抽取的这些学生中，玲玲的测试成绩为85分，你认为85分一定是这些学生成绩的中位数吗？请简要说明理由．（3）若成绩在80分以上（包括80分）为优秀，请估计全校1400名学生中成绩优秀的人数．22．某公司共有三个部门，根据每个部门的员工人数和相应每人所创的年利润绘制成如下的统计表和扇形图．各部门人数及每人所创年利润统计表部门员工人数每人所创的年利润/万元A510B 8C5（1）①在扇形图中，C部门所对应的圆心角的度数为___________；②在统计表中，___________，___________；（2）求这个公司平均每人所创年利润．23．在“慈善一日捐”活动中，为了解某校学生的捐款情况，抽样调查了该校部分学生的捐款数（单位：元），并绘制成下面的统计图．（1）本次调查的样本容量是________，这组数据的众数为________元；（2）求这组数据的平均数；（3）该校共有600学生参与捐款，请你估计该校学生的捐款总数．24．学校为了让同学们走向操场、积极参加体育锻炼，启动了“学生阳光体育运动”，张明和李亮在体育运动中报名参加了百米训练小组．在近几次百米训练中，教练对他们两人的测试成绩进行了统计和分析，请根据图表中的信息解答以下问题：平均数 中位数 方差 张明13.30.004 李亮13.30.02（1）张明第2次的成绩为： 秒；（2）张明成绩的平均数为： ；李亮成绩的中位数为： ；（3）现在从张明和李亮中选择一名成绩优秀的去参加比赛，若你是他们的教练，应该选择谁？请说明理由．25．某区正在积极创建国家模范卫生城市，学校为了普及学生卫生健康知识，提高学生创卫意识，举办了创卫知识竞赛，以下是从初一、初二两个年级随机抽取20名同学的测试成绩进行调查分析，成绩如下：初一：75 88 93 65 78 94 89 68 95 50 89 88 89 89 77 95 87 88 92 91 初二：74 96 96 89 97 74 69 76 72 78 99 72 97 85 98 74 89 73 98 74 （1）整理、描述数据： 成绩x 5059x ≤≤6069x ≤≤7079x ≤≤8089x ≤≤ 90100x ≤≤初一（频数） 1 2 3 m6 初二（频数）1937（说明：成绩90分及以上为优秀，80~90分为良好，60~80分为合格，60分以下不合格） 分析数据：平均数 中位数 众数 初一 84 a89初二8481.5b请根据上述的数据，填空：m =______；a =______；b =______；（2）得出结论：你认为哪个年级掌握创卫知识水平较好并说明理由．（至少从两个不同的角度说明推断的合理性）．26．为弘扬传统文化，某校开展了“传承经典文化，阅读经典名著”活动．为了解七、八年级学生（七、八年级各有600名学生）的阅读效果，该校举行了经典文化知识竞赛．现从两个年级各随机抽取20名学生的竞赛成绩（百分制）进行分析，过程如下：收集数据：七年级： 79，85，73，80， 75，76，87， 70， 75，94，75，79，81，71， 75，80，86，59， 83， 77．八年级： 92，74， 87，82，72，81， 94，83，77， 83，80，81，71，81，72，77，82，80，70，41．整理数据：分析数据：应用数据：（1）由上表填空：a=，b=，c=，d=．（2）估计该校七、八两个年级学生在本次竞赛中成绩在90分以上的共有多少人？（3）你认为哪个年级的学生对经典文化知识掌握的总体水平较好，请说明理由．【参考答案】***试卷处理标记，请不要删除一、选择题1．B解析：B【分析】根据方差的意义即可判断．【详解】解：方差是反映一组数据的波动大小的一个量．方差越大，则平均值的离散程度越大，稳定性也越小；反之，则它与其平均值的离散程度越小，稳定性越好．故选：B．【点睛】本题考查方差，平均数，中位数，众数等知识，解题的关键是熟练掌握基本知识，属于中考常考题型．2．B解析：B【分析】根据方差的意义求解可得．【详解】∵乙的成绩方差＜甲成绩的方差，∴乙的成绩比甲的成绩稳定，故选B.【点睛】本题主要考查方差，方差是反映一组数据的波动大小的一个量．方差越大，则平均值的离散程度越大，稳定性也越小；反之，则它与其平均值的离散程度越小，稳定性越好．3．D解析：D【分析】众数就是出现次数最多的数，而中位数就是大小处于中间位置的数，根据定义即可求解．【详解】在这10名队员的年龄数据里，15岁出现了4次，次数最多，因而众数是15；10名队员的年龄数据里，第5和第6个数据分别为14，15，其平均数141514.52+=，因而中位数是14.5．故选：D．【点睛】本题考查了众数和中位数的概念：一组数据中出现次数最多的数据叫做众数；注意找中位数的时候一定要先排好顺序，然后再根据奇数和偶数个来确定中位数，如果数据有奇数个，则正中间的数字即为所求，如果是偶数个则找中间两位数的平均数．4．C解析：C【分析】可根据调查的选择、中位数和众数的求法、方差及随机事件的意义，逐个判断得结论．【详解】解：因为我国中学生人数众多，其课外阅读的情况也不需要特别精确，所以对我国中学生课外阅读情况的调查，宜采用抽样调查，故选项A不正确；因为B中数据按从小到大排列为1、2、3、3、5、5、5，位于中间的数是3，故该组数据的中位数为3，所以选项B说法不正确；因为0.003＜0.1，方差越小，波动越小，数据越稳定，所以甲组数据比乙组数据稳定，故选项C说法正确；因为抛掷硬币属于随机事件，抛掷一枚硬币100次，不一定有50次“正面朝上”故选项D说法不正确．故选：C ． 【点睛】本题的关键在于掌握调查的选择、中位数和众数的求法、方差及随机事件的意义．5．A解析：A 【分析】首先对这组数据进行排序，根据中位数和众数的定义回答即可． 【详解】∵这组数据排序后为83，83，87，87，87，90，∴这组数据的众数是87，这组数据的中位数是87872+=87． 故选A ． 【点睛】本题考查了中位数和众数的定义．注意找中位数的时候一定要先排好顺序，然后再根据数据个数确定中位数：如果数据有奇数个，则正中间的数字即为所求；如果是偶数个则找中间两位数的平均数．6．D解析：D 【分析】根据平均数、中位数、众数及方差的定义以及计算公式，依次计算各选项即可作出判断． 【详解】解：A 、平均数是-2，结论正确，故A 不符合题意； B 、中位数是-2，结论正确，故B 不符合题意； C 、众数是-2，结论正确，故C 不符合题意； D 、方差是203，结论错误，故D 符合题意； 故选：D ． 【点睛】本题考查平均数、中位数、众数及方差的知识，属于基础题，掌握各部分的定义及计算方法是解题关键．7．C解析：C 【分析】根据平均数求出x 的值，再利用中位数定义即可得出答案． 【详解】∵5，6，6，x ，7，8，9，这组数据的平均数是7， ∴()775667898x =⨯-+++++=， ∴这组数据从小到大排列为：5，6，6，7，8，8，9∵这组数据最中间的数为7， ∴这组数据的中位数是7． 故选C ． 【点睛】此题主要考查了中位数，根据平均数正确得出x 的值是解题关键．8．B解析：B 【解析】 【分析】要判断甲，乙射击成绩的稳定性就是要比较两人成绩的方差的大小，关键是求甲的方差．甲的这组数中的众数是8就说明a ，b ，c 中至少有两个是8，而平均数是6，则可以得到a ，b ，c 三个数其中一个是2，另两个数是8，求得则甲的方差，再进行比较得出结果． 【详解】∵这组数中的众数是8， ∴a ，b ，c 中至少有两个是8， ∵平均数是6，∴a ，b ，c 三个数其中一个是2， ∴(4+1+1+4+4+16)＝5，∵5>4，∴乙射击成绩比甲稳定． 故选：B ． 【点睛】本题考查方差的意义．方差是用来衡量一组数据波动大小的量，方差越大，表明这组数据偏离平均数越大，即波动越大，数据越不稳定；反之，方差越小，表明这组数据分布比较集中，各数据偏离平均数越小，即波动越小，数据越稳定．9．D解析：D 【分析】把六名学生的数学成绩从小到大排列为：82，96，102，108，108，110，求出众数、中位数、平均数和方差，即可得出结论． 【详解】解：把六名学生的数学成绩从小到大排列为：82，96，102，108，108，110， ∴众数是108，中位数为1021081052+=，平均数为82961021081081101016+++++=，方差为()()()()()()222222182101961011021011081011081011101016⎡⎤-+-+-+-+-+-⎣⎦ 94.393≈≠；故选D ． 【点睛】考核知识点：众数、中位数、平均数和方差；理解定义，记住公式是关键.10．B解析：B 【解析】 【分析】根据中位数和众数的定义找出从小到大排列后最中间的数和出现次数最多的数即可． 【详解】把这组数据从小到大排列：84，89，90，90，90，91，96， 最中间的数是90，则中位数是90；90出现了3次，出现的次数最多，则众数是90； 故选B ． 【点睛】此题考查了中位数和众数，中位数是将一组数据从小到大（或从大到小）重新排列后，最中间的那个数（最中间两个数的平均数），叫做这组数据的中位数；众数是一组数据中出现次数最多的数．11．D解析：D 【解析】 【分析】根据平均数、中位数和方差的计算公式分别对每一项进行分析，即可得出答案． 【详解】甲队员10次射击的成绩分别为6，7，7，7，8，8，9，9，9，10，则中位数882+=8， 甲10次射击成绩的平均数=（6+3×7+2×8+3×9+10）÷10=8（环），乙队员10次射击的成绩分别为6，7，7，8，8，8，8，9，9，10，则中位数是8， 乙10次射击成绩的平均数=（6+2×7+4×8+2×9+10）÷9=8（环）， 甲队员成绩的方差=110×[（6-8）2+3×（7-8）2+2×（8-8）3+3×（9-8）2+（10-8）2]=1.4； 乙队员成绩的方差=110×[（6-8）2+2×（7-8）2+4×（8-8）3+2×（9-8）2+（10-8）2]=1.2， 综上可知甲、乙的中位数相同，平均数相同，甲的方差大于乙的方差， 故选D ． 【点睛】本题考查了平均数、中位数和方差的定义和公式，熟练掌握平均数、中位数、方差的计算是解题的关键.12．C解析：C【解析】【分析】众数是一组数据中出现次数最多的数据，中位数是将一组数据按大小依次排列，把处在最中间位置的一个数据或者最中间两个数据的平均数叫这组数据的中位数．本组数据中，把数据按照从大到小的顺序排列，最中间的两个数的平均数即为中位数．【详解】由统计表可知：体育锻炼时间最多的是5小时，故众数是5小时；统计表中是按从小到大的顺序排列的，最中间两个人的锻炼时间都是5小时，故中位数是5小时．故选C ．【点睛】本题考查了确定一组数据的众数和中位数的能力．将一组数据从小到大（或从大到小）重新排列后，最中间的那个数（最中间两个数的平均数），叫做这组数据的中位数．注意找中位数的时候一定要先排好顺序，然后再根据奇数和偶数个来确定中位数．如果数据有奇数个，则正中间的数字即为所求；如果是偶数，则找中间两位数的平均数．二、填空题13．2【分析】根据方差是用来衡量一组数据波动大小的量每个数都加3所以波动不会变方差不变【详解】解：设abc 的平均数是d 所以方差不变故答案为：2【点睛】本题主要考查了方差的公式解题的关键是当数据都加上一个 解析：2【分析】根据方差是用来衡量一组数据波动大小的量，每个数都加3，所以波动不会变，方差不变.【详解】解：设a 、b 、c 的平均数是d,()222211S =()()23a d b d c d ⎡⎤-+-+-=⎢⎥⎣⎦ , ()222221S =33(33)(33)23a d b d c d ⎡⎤+-+++-+++-+=⎢⎥⎣⎦ , ()222221S =()()23a d b d c d ⎡⎤-+-+-=⎢⎥⎣⎦, 所以方差不变.故答案为：2.【点睛】本题主要考查了方差的公式，解题的关键是当数据都加上一个数时，方差不变. 14．1748【分析】根据平均数和方差公式的变形即可得到结果【详解】一组数据x1x2x3x4x5的平均数是5则4x1-34x2-34x3-34x4-34x5-3的平均数是4（x1+x2+x3+x4+x5）解析：17 48【分析】根据平均数和方差公式的变形即可得到结果．【详解】一组数据x1，x2，x3，x4，x5的平均数是5，则4x1-3，4x2-3，4x3-3，4x4-3，4x5-3的平均数是15[4（x1+x2+x3+x4+x5）-15]=17，∵新数据是原数据的4倍减3；∴方差变为原来数据的16倍，即48．故答案为：17；48．【点睛】本题考查方差的计算公式的运用：一般地设有n个数据，x1，x2，…x n，若每个数据都放大或缩小相同的倍数后再同加或同减去一个数，其平均数也有相对应的变化，方差则变为这个倍数的平方倍．15．15或-05【分析】根据极差的概念求出x的值然后根据平均数的概念求解【详解】一组数据-32-10123x的极差是11当x为最大值时x﹣（﹣3）=11x=8平均数是：；当x是最小值时3﹣x=11解得：解析：1.5或-0.5【分析】根据极差的概念求出x的值，然后根据平均数的概念求解．【详解】一组数据-3, 2,-1,0,1,2,3,x的极差是11，当x为最大值时，x﹣（﹣3）=11，x=8，平均数是：[3+ 2+1+0+1+2+3+8]8 1.5--÷=（）；当x是最小值时，3﹣x=11，解得：x=﹣8，平均数是：[3+ 2+1+0+1+2+3+(8)]80.5--÷=-（）-，故答案为：1.5或-0.5【点睛】本题考查了极差和平均数，掌握平均数是所有数据的和除以数据的个数；极差就是这组数中最大值与最小值的差，是解题的关键16．（1）1617；（2）这10位居民一周内使用共享单车的平均次数是14次【分析】（1）将数据按照大小顺序重新排列计算出中间两个数的平均数即是中位数出现次数最多的即为众数；（2）根据平均数的概念将所有数解析：（1）16，17；（2）这10位居民一周内使用共享单车的平均次数是14次【分析】（1）将数据按照大小顺序重新排列，计算出中间两个数的平均数即是中位数，出现次数最多的即为众数；（2）根据平均数的概念，将所有数的和除以10即可；【详解】解：（1）按照大小顺序重新排列后，第5、第6个数分别是15和17，所以中位数是（15+17）÷2＝16，17出现3次最多，所以众数是17，故答案是16，17；（2）110×（0+7+9+12+15+17×3+20+26）＝14，答：这10位居民一周内使用共享单车的平均次数是14次；【点睛】本题考查了中位数、众数、平均数的概念以及利用样本平均数估计总体．抓住概念进行解题，难度不大，但是中位数一定要先将所给数据按照大小顺序重新排列后再求，以免出错．17．76分；【解析】【分析】根据加权平均数的计算方法：先求出这10名同学的总成绩再除以10即可得出答案【详解】这10名同学的平均成绩为：=76（分）故答案为：76分【点睛】本题考查的是加权平均数的求法本解析：76分；【解析】【分析】根据加权平均数的计算方法：先求出这10名同学的总成绩，再除以10，即可得出答案．【详解】这10名同学的平均成绩为：7048106⨯+⨯=76（分），故答案为：76分．【点睛】本题考查的是加权平均数的求法．本题易出现的错误是对加权平均数的理解不正确，而求70、80这两个数的平均数．18．乙【解析】【分析】直接利用方差的意义方差越小越稳定进而分析得出答案【详解】∵方差=1515＜28∴射击成绩较稳定的是：乙故答案为：乙【点睛】此题主要考查了方差正确把握方差的意义是解题关键解析：乙【解析】【分析】直接利用方差的意义，方差越小越稳定，进而分析得出答案．【详解】∵方差222.8,S S=甲乙=1.5，1.5＜2.8，∴射击成绩较稳定的是：乙．故答案为：乙．【点睛】此题主要考查了方差，正确把握方差的意义是解题关键．19．【解析】【分析】先求出平均数再根据方差的公式计算即可【详解】这组数据的平均数是：则这组数据的方差是；故答案为【点睛】此题考查了方差：一般地设n 个数据的平均数为则方差它反映了一组数据的波动大小方差越大 解析：1.6【解析】【分析】先求出平均数，再根据方差的公式计算即可．【详解】这组数据的平均数是：()5336354++++÷=， 则这组数据的方差是(22221S [(54)3(34)64) 1.65⎤=-+⨯-+-=⎦； 故答案为1.6．【点睛】此题考查了方差：一般地设n 个数据，1x ，2x ，n x ⋯的平均数为x ，则方差(222212n 1S [(x x)(x x)x x)n⎤=-+-+⋯+-⎦，它反映了一组数据的波动大小，方差越大，波动性越大，反之也成立． 20．0【解析】【分析】先确定出abc 后根据方差的公式计算abc 的方差【详解】解：平均数；中位数；众数；bc 的方差故答案是：0【点睛】考查了平均数中位数众数和方差的意义解题的关键是正确理解各概念的含义解析：0.【解析】【分析】先确定出a ，b ，c 后，根据方差的公式计算a ，b ，c 的方差.【详解】解：平均数()123242a =+++÷=；中位数()2222b =+÷=；众数2c =；a ∴，b ，c 的方差(222[(22)(22)22)30⎤=-+-+-÷=⎦．故答案是：0．【点睛】考查了平均数、中位数、众数和方差的意义，解题的关键是正确理解各概念的含义． 三、解答题21．（1）50；见解析；（2）不一定；见解析；（3）728【分析】（1）由总人数为100可得m的值，从而补全图形；（2）根据中位数的定义判断即可得；（3）样本中成绩在80分以上（包括80分）占调查人数的161050+，因此利用样本估计总体的方法列出算式1610140050+⨯，求解可得结果．【详解】解：（1）样本容量是：10÷20%＝50．70≤a＜80的频数是50−4−8−16−10＝12（人），补全图形如下：（2）不一定是这些学生成绩的中位数．理由：将50名学生知识测试成绩从小到大排列，第25、26名的成绩都在分数段80≤a≤90中，他们的平均数不一定是85分，因为25、26的成绩的平均数才是整组数据的中位数．（3）全校1400名学生中成绩优秀的人数为：1610140072850+⨯=（人）．【点睛】本题考查了条形统计图、用样本估计总体、统计量的选择，解答本题的关键是明确题意，找出所求问题需要的条件，利用数形结合的思想解答．22．（1）①108°；②9，6；（2）7.6万元.【解析】试题分析：（1）①在扇形图中，由C部门所占比例乘以360°即可得出C部门所对应的圆心角的度数.②先计算出A部门所占比例，再计算出总人数，根据B、C部门所占比例即可求出b、c的值.（2）利用加权平均数的计算公式计算即可．试题（1）①360°×30%=108°；②∵a%=1-45%-30%=25%5÷25%=20∴20×45%=9（人）20×30%=6（人）（2）10×25%+8×45%+5×30%=7.6答：这个公司平均每人所创年利润是7.6万元.考点：1.扇形统计图；2.加权平均数.23．（1）30，10；（2）平均数为12元；（3）学生的捐款总数为7200元.【分析】（1）由题意得出本次调查的样本容量是6118530+++=，由众数的定义即可得出结果；（2）由加权平均数公式即可得出结果；（3）由总人数乘以平均数即可得出答案．【详解】（1）本次调查的样本容量是6118530+++=，这组数据的众数为10元；故答案为30，10；（2）这组数据的平均数为6511108155201230⨯+⨯+⨯+⨯=（元）；（3）估计该校学生的捐款总数为600127200⨯=（元）．【点睛】此题考查的是条形统计图的综合运用．读懂统计图，从统计图中得到必要的信息是解决问题的关键．条形统计图能清楚地表示出每个项目的数据．本题也考查了平均数、中位数、众数的定义以及利用样本估计总体的思想．24．（1）13.4；（2）13.3秒，13.3秒；（3）选择张明，理由见解析．【分析】（1）根据统计图给出的数据可直接得出答案；（2）利用平均数的计算公式可得出张明成绩的平均数；先将李亮的成绩按照从小到大排列，然后即可得到这组数据的中位数；（3）在平均数、中位数相同的情况下，再根据方差越小数据越稳定，即可得出答案．【详解】解：（1）根据统计图可知，张明第2次的成绩为13.4秒，故答案为：13.4；（2）张明成绩的平均数为：13.313.413.313.213.35++++=13.3（秒）；李亮的成绩是：13.2，13.4，13.1，13.5，13.3，把这些数从小到大排列为：13.1，13.2，13.3，13.4，13.5，则李亮成绩的中位数是：13.3秒；故答案为：13.3秒，13.3秒；（3）选择张明参加比赛，因为张明和李亮成绩的平均数、中位数都相同，但张明成绩的方差小于李亮成绩的方差，张明成绩比李亮成绩稳定．【点睛】本题考查了平均数，中位数，方差的意义．平均数表示一组数据的平均程度；中位数是将一组数据从小到大（或从大到小）重新排列后，最中间的那个数（或最中间两个数的平均数）；方差是用来衡量一组数据波动大小的量．25．（1）8，88.5，74；（2）初一的水平较好，理由见解析.【分析】（1）根据所给数据可得出m的值，根据中位数和众数的定义可得a，b的值；（2）从中位数和众数的角度分析可知初一的水平较好．【详解】解：（1）由初一的成绩可知，m＝8，将初一的成绩按从低到高排列，第10、11名的成绩分别为：88，89，故初一的中位数a＝888988.52；初二的成绩中74分的人数最多，故初二的众数b＝74，故答案为：8，88.5，74；（2）初一的水平较好，理由：因为初一和初二的平均数都是84分，但是初一的中位数是88.5分，众数是89分，而初二的中位数是81.5分，众数是74分，即初一年级学生成绩的中位数和众数明显高于初二年级的学生成绩的中位数和众数，故初一的水平较好．【点睛】本题考查了频数分布表、中位数和众数的意义，掌握中位数和众数的求法是解题的关键．26．（1）11，10，78，81；（2）90人；（3）八年级学生对经典文化知识掌握的总体水平较好，理由是八年级学生成绩的中位数较高【分析】（1）根据已知数据及中位数和众数的概念求解即可．（2）利用样本估计总体思想求解可得．（3）答案不唯一，合理即可．【详解】（1）a=11，b=10，c=78，d=81（2）312009040⨯=（人）答：估计七八年级90分以上的学生共90人（3）八年级学生对经典文化知识掌握的总体水平较好，理由:八年级学生成绩的中位数较高【点睛】。
人教版八年级英语下册Unit 5 单元测试题含答案
八年级英语下册Unit 5 单元测试题(45分钟100分)第Ⅰ卷(共40分)Ⅰ. 听力(10分)（略）Ⅰ. 单项选择(10分)( )1. This morning I had hardly got to my school when it ________ to rain.A．had begun B．was beginningC．began D．begins( )2. He ________ when the UFO arrived. He didn't wake until the UFO disappeared.A．slept B．was sleepingC．was doing homew ork D．was singing( )3. —Where were you at 7：00 last night?—I ________ to my mom at home.A．write B．was writingC．wrote D．am writing( )4. —Did you see Mr Black just now?—Yes. He ________ his car when I met him.A．parked B．was parkingC．parks D．will park( )5. Eddie was sleeping ________ Millie was reading a magazine.A．until B．whileC．before D．after( )6. —Could you tell me what he said just now?—Sorry, I what was happening outside.A. had thoughtB. was thinkingC. thoughtD. think( )7. —I was at the cinema at nine yesterday evening. What about you?—I books.A. am readingB. was readingC. will readD. had read( )8. —What were you doing it was raining?—I was reading a book.A. beforeB. ifC. whileD. after( )9. Paul walked into the bedroom because his wife and baby were sleeping.A. silentB. silenceC. in silenceD. loudly( )10. During the past two years, several earthquakes in different places of the world.A. happenB. happenedC. take placeD. took placeⅠ. 完形填空(10分)Evening came. It was time for Mr. Bell to close his shop. He was checking his money. His son Tom, who was 15, had just gone outside to buy a piece of newspaper. Just then, a big man walked1the shop. He had a gun(枪)in his hand.When Tom came back, he could hear the man asking his father for2. Tom could see the gun in the man’s hand, but the man didn’t3or hear Tom.Tom hurried up to the street. He looked for the police, 4he didn’t find anyone. Then Tom saw an old baseball bat(棒球球棒)5in the street. “Maybe this will help, ”he thought. He ran6with it.His father was just giving some of the money to the man. The man was watching Tom’s father. Tom knew he could not 7long. “Now is the time. I must do it now. ”Tom went up to the man and knocked him down8the bat.Tom and his father then ran outside. This time they found the9and told them what had happened. The police10 went to the shop and caught the man.( )1. A. out of B. around C. into D. down( )2. A. paper B. water C. money D. food( )3. A. know B. catch C. meet D. see( )4. A. but B. so C. for D. or( )5. A. lies B. to lie C. lying D. is lying( )6. A. back B. over C. away D. past( )7. A. hold B. wait C. rest D. watch( )8. A. by B. from C. without D. with( )9. A. neighbors B. police C. friend D. children( )10. A. quick B. slow C. quickly D. slowlyⅠ. 阅读理解(10分)It wa raining heavily as I was walking up the hill towards the station at six o’clock on a Saturday morning. At this early hour there wasn’t much traffic and there weren’t many people. Just as I was crossing the road near the top of the hill, a car came around the corner. It was traveling very fast. Suddenly it hit a lamp post(路灯柱)and turned over.I ran to the car to help the driver at once. He was badly hurt and there was a lot of blood on his face. A young woman hurried into the station and phoned for an ambulance(救护车)while I took care of the driver. Many people came to see what happened. A policeman arrived a few minutes later and asked me a lot of questions about the accident. After a while the ambulance arrived and the driver was sent to the hospital.On Monday morning I went to the hospital to see the man. The doctor told me that he was much better, and he would leave the hospital after a few days’rest.( )1. Where did the accident happen?A. Near the school.B. Near the top of the hill.C. In the school.D. Near the hospital.( )2. What happened to the driver?A. He drove the car very well.B. His car hit a lamp post.C. His car turned over.D. Both B and C.( )3. Who hurried into the station and phoned for an ambulance?A. The writer.B. A policeman.C. Some people.D. A young woman.( )4. What did the policeman do?A. He took the driver away.B. He sent the driver to the hospital.C. He asked the writer a lot of questions.D. He phoned for an ambulance.( )5. Was the driver dead at last?A. Yes, he wasn’t.B. No, he was.C. Yes, he was.D. No, he wasn’t.Ⅴ.补全对话(10分)A. What were you doing at that time?B. When did you come to my classroom?C. Did you have a good time there?D. We were in the park at that time.E. She was singing and dancing with some girls.Where were you?B: 1A: At around three o’clock.B: Oh. 2We didn’t have any classes yesterday afternoon, so we went to the park to relax ourselves.A: 3B: Well, I was playing tennis with Jack.A: What was Mary doing?B: 4A: What about Linda?B: She was reading an interesting book. She likes reading, you know.A: Yes. 5B: Yes, we enjoyed ourselves very much.第Ⅰ卷(共60分)Ⅵ. 词汇运用(10分)(Ⅰ)根据句意及首字母或汉语提示完成单词。
2020-2021学年人教版八年级英语下册unit5单元测试卷及答案
八年级下英语unit5 What were you doing when therainstorm came？单元检测听力部分(20分)一、听力(本题有15小题，第一、二节每小题1分，第三节每小题2分；共计20分)第一节：听小对话，回答问题。
()1.What was Tom doing at six yesterday evening?A．He was doing the cleaning.B．He was doing the dishes.C．He was running.()2.What was the girl's mother doing?A．She was cleaning the room.B．She was shopping on the Internet.C．She was shopping in a supermarket.()3.What is the boy's brother going to be?A．A pianist.B．A computer programmer.C．An astronaut.()4.What is their father doing?A．He is taking a walk.B．He is playing soccer.C．He is cutting hair.()5.What's the boy's mother's hobby?A．Shopping. B．Reading. C．Running.第二节：听长对话，回答问题。
听下面一段较长的对话，回答6—7两小题。
()6.Why didn't Scott watch the football match?A．He studied for a test.B．He didn't want to watch it.C．He went to visit his parents.()7.Who won the match?A．Class 1. B．Class 2. C．Class 3.听下面一段较长的对话，回答8—10三小题。
人教版初中英语八年级下册Unit5单元测试试卷含答-案答案在前
答案一、【答案】1.A 2.C 3.A 4.B 5.C 6.A 7.A 8.D 9.A 10.C二、【答案】1.D 2.A 3.C 4.A 5.B 6.C 7.B 8.D 9.A 10.B三、【答案】1.D 2.A 3.C 4.D 5.C6.The four men didn’t wait for a second. They got out and ran as quickly as possible.7.Because she thought they tried to take away her car.8.start the car 9.F 10.T四、【答案】1.pick up 2.fall asleep 3.while 4.on/making her way 5.is surprised to find五、【答案】1.events 2.washed rgest 4.lived 5.happened 6.sick 7.had 8.While9.noise 10.outside六、【答案】One possible version:Yesterday I was on the way to school with Peter at 7:00 in the morning. Then I was having English class from 8:00 to 9:00. At 12:00 I was having lunch at school. When it began to rain at 2:40 p.m., I was buying books in a bookshop. I think they will help me study better. I was having my hair cut at 4:30 p.m. and at 6:45 p.m., I was taking a shower. After finishing my homework, I went to bed. How busy a day I had!一、单项选择（10 分）（）1. —The newspaper said a famous singer would come to our city this morning.—Yes, but it’s ________ that he didn’t come.A. strangeB. happyC. wrongD. exciting（）2. —Where is my dictionary?—I brought it to you ________ you were watching TV last night.A. untilB. beforeC. whileD. after（）3. Although the alarm clock ________, he didn’t wake up yesterday morning.A. went offB. went upC. went onD. went down（）4. —Can we walk across the river now?—No, we can’t. The water ________ after the heavy rain yesterday.A. droppedB. roseC. developedD. carried（）5. —Did you see a boy in black pass by two minutes ago?—No, sir. I ________ an English magazine.A. readB. am readingC. was readingD. reads（）6. —Listen! Who is ________ against the windows?—Well. Maybe it’s rain.A. beatingB. readingC. openingD. hurting（）7. I am sure she tells the ________ because she never tells lies.A. truthB. accidentC. neighborD. story（）8. ________ April 20th, 2013, a terrible earthquake happened in Ya’an, Sichuan.A. InB. AtC. ToD. On（）9. —Were you at home at 9:00 p.m. yesterday?—Yes, I ________ for a call from Paris at that time.A. was waitingB. am waitingC. will waitD. waited（）10. They went out of the room in ________ after they heard the bad news.A .fact B. surprise C. silence D. public二、完形填空（20 分）As we all remember that terrible day on September 11, 2001, I look back at 1 I was doing during those moments（时刻）. And I remember very clearly, that I was in my 2 , around 8:30 a.m., driving to work.When the first plane hit, I was driving; I was 3 the radio, and the news came on. An airplane hit the World Trade Center. The 4 thing that came to my mind was it was just an accident.As I got to the office, I 5 the TV. And when we were talking, the second airplane hit. We6 believe it. What was going on?We went on watching those 7 coming from the TV. It was clear that we were under attack（袭击）.What a morning! We couldn’t work; we all 8 the office; we all went to one of the workers’ home nearby. 9 we went on watching TV news, the president speaking, the terrible pictures of the buildings, and so on. Then the buildings started to 10 , one by one. We knew things were going to be very different from then on; I had a bad feeling about the future.（）1. A. which B. when C. why D. what（）2. A. car B. bus C. bike D. train（）3. A. hearing about B. talking about C. listening to D. looking at（）4. A. first B. second C. third D. last（）5. A. turned off B. turned on C. turned down D. turned over（）6. A. needn’t B. mightn’t C. couldn’t D. mustn’t（）7. A. plays B. pictures C. persons D. planes（）8. A. visited B. cleaned C. arrived D. left（）9. A. And B. So C. Till D. If（）10. A. move B. fall C. destroy D. fly三、阅读理解（20 分）AFrank was a boy of ten. His father worked in a cinema and his mother worked in a shop. He lived not far from his school. He always walked to school and then walked home. On his way home, he had to pass a playground. It was very wet after it rained. One day, when he got home, his clothes were all wet. His mother became angry and said, “Don’t play in the water on your way home from school!”On the next day Frank came home with wet and dirty clothes again. His mother became much angrier. “I’ll tell your father if you come back with wet clothes again,” said his mother. “He’ll punish（惩罚）you, you know.”The third day the little boy was dry when he came home. “You’re a good boy today,” his mother said happily.” You didn’t play in the water.”“No,” the boy said unhappily. “There were too many older boys in the water when I got there this afternoon. There wasn’t any room for me at all! They didn’t allow me to play there.”（）1. Frank went to school ________ every day.A. by busB. by carC. by bikeD. on foot（）2. There was ________ between Frank’s house and school.A. a playgroundB. a cinemaC. a shopD. a post office（）3. Frank liked to play on the playground when ________.A. it was windyB. the children played basketball thereC. there was some waterD. his father was busy with his work（）4. Frank was afraid of ________ most.A. his motherB. his fatherC. his teacherD. the older boys（）5. Frank’s clothes were dry on the third afternoon because ________.A. he played in the water carefullyB. he took off his clothes before playingC. there wasn’t room on the playgroundD. there was no water on the playgroundBMrs Hand was old but she was very strong and healthy. One day when she was returning to her car after doing some shopping, she found four young men were sitting in her car. At once she put down her shopping bags and took out her handgun（手枪）, pointed it at them and shouted at the top of her voice, “I have a handgun and I know how to use it! Get out of my car!”The four men didn’t wait for a second（秒）. They got out and ran as quickly as possible（尽可能快地）.Mrs Hand put her shopping bags into the back of the car and got into the driver’s seat.The old lady was surprised to find that she could not ________ with her key. She tried again and again and then felt something strange. A few minutes later she saw her own car parked four or five meters away! She got in her own car and drove to the police station.When the policeman heard her story, he couldn’t help laughing loudly and pointed to another information desk. There the four young men were reporting a car robbery（抢劫案）by a crazy old woman.根据短文完成下列任务。
人教部编最新版八下第五单元测试题(附答案)
最新人教部编版八年级下册语文第五单元测试卷及答案(时间：120分钟总分：120分)一、积累与运用(30分)1．下列加点字的注音完全正确的一项是( )(3分)A．颠簸．bǒ推搡． sang 灼．热zhuó怒不可遏．èB．蘸．水zhàn 黧．黑lí妩媚．mèi 大煞．风景shàC．眺．望tiào 懈．怠xiè巉．峻chán 接踵．而至zhǒngD．穹．顶qióng 虔．诚qián 拾．级shè纷至沓．来dá2．下列词语中没有错别字的一项是( )(3分)A．寒噤缭绕川流不息轻歌漫舞B．迂回喧哗震耳欲聋风云变幻C．演译蜿蜒目眩神迷瞬息万变D．棱角砾石名符其实历历在目3．下列语句中加点的成语使用有误的一项是( )A．炸弹在敌军中开了花，震耳欲聋．．．．，炸得敌人喊爹叫娘。
B．非洲一些国家，政局动荡，风云变幻．．．．。
C．近年来，全国各地道德模范络绎不绝．．．．，传播正能量，为全社会树立了榜样。
D．江君的画展开展后，参观的人接踵而至．．．．。
4．下列句子中没有语病的一项是（）A．许多游客听着瀑布欢呼呐喊，轰鸣声与欢笑声此起彼伏。
B．喜欢游泳的人大多有这种体验：不管天气很热，但是刚从水里出来时会感到有点凉，有时甚至还会打一下寒战。
C．洞内有我国首次发现的红玛瑙质构成的自然景观，景观的形成距今已有大约16亿多年的历史。
D．蓝天与雪山下的石头村庄交相辉映，伴着纳西古乐，村民用颇具特色的舞步抒发着简单的快乐。
5．根据上下文，填写在横线上的语句，排序最恰当的一项是（）了……①她的金色的柔光滟滟地泻在广裹的大地上，远近的房屋、树梢、山影、水痕，全都泛出了浅金色的光芒。
②她又是那么圆，圆得似乎要凸出来、蹦出来了。
③她低低的淳在澄净如洗的空中，离我那么近，仿佛一伸手便可以摘下。
④我狂喜地望着这神奇的月色，仿佛走进了金色的梦境，一切都是闪闪烁烁、蓬蓬勃勃的。
人教版八年级英语下册Unit 5 单元测试(含答案)
Unit 5 What were you doing when the rainstorm came? 单元测试姓名：__________ 班级：__________ 学号：__________一、单选题（共15题；共15分）1.__________ the children have fun, parents can take dance lessons on the beach.A. WhenB. IfC. WhileD. Once2.Tom didn't pass the exam. So he walked home _____.A. in silenceB. in historyC. on silenceD. on history3.I don't remember __________ the book yesterday.A. where I putB. where did I putC. where will I putD. where I will put4.—It's hot today.—That's right. It __________ summer.A. looksB. sounds likeC. tastes likeD. feels like5.—When did the earthquake (地震) in Lushan happen?—It happened __________ 8:02 __________ the morning of April 20, 2013.A. on, inB. at, inC. at, onD. on; on6.He likes to run before the sun _____ in the morning.A. risesB. roseC. raisesD. raised7.Mary was listening to music while she _________ to school.A. walkedB. was walkingC. is walkingD. walks8.Mo Yan's books have been sold out(卖光) in many bookstores __________ his winning of the Nobel Literature Prize (诺贝尔文学奖).A. becauseB. sinceC. asD. because of9.It's very cold in Harbin．Snowing in October is nothing there．A. strangeB. usefulC. traditionalD. natural10.I didn't sleep until the wind died _____.A. atB. upC. downD. out11.—Your room is in a mess, David.—I'm sorry. I'll __________ right now.A. pick upB. clean it upC. clean up itD. turn it up12.Lisa took a photo of her friends while they _____ games.A. playB. are playingC. playedD. were playing13.Li Na is __________ famous __________ all the tennis fans in China know her.A. too; toB. enough, toC. as, asD. so; that14.Do you remember ________ when the car accident happened?A. what you were doingB. what were you doingC. what you didD. what did you do15.What ______ when the earthquake happened on May 12th.A. are you doingB. were you doingC. do you doD. did you do二、完形填空（共10分）In 2011, Henry and I took our children to London to watch the wedding of Prince William and Kate Middleton. We 1 Buckingham Palace at nine o'clock in the morning. The wedding was at eleven o'clock, but the streets were 2 crowded.There were big screens around Buckingham Palace and we watched the wedding service at Westminster Abbey 3 the screens. Kate looked beautiful. She wore a nice white dress. Prince William wore a smart red uniform.4 the wedding service, Prince William and Kate left for Buckingham Palace. We waited5 . Everyone was shouting and cheering. Even the policemen were happy and making6 . Suddenly we heard the sound of music and drums. A group of soldiers(士兵)were7 along the street. They were walking and playing music. After them we saw a beautiful carriage(四轮马车).8 the carriage came close to the place where we were standing. People around us were cheering loudly. My 9 were shouting excitedly. Henry was taking photos. Prince William smiled and waved at(向……挥手)us. He looked so happy and friendly. It was a fantastic experience and I will never 10 it.1. A. looked for B. arrived at C. dreamed of D. cleaned up2. A. even B. also C. already D. still3. A. with B. of C. on D. for4. A. After B. Until C. During D. Since5. A. luckily B. seriously C. quietly D. excitedly6. A. rules B. decisions C. jokes D. plans7. A. standing B. coming C. waiting D. riding8. A. Certainly B. Commonly C. Finally D. Probably9. A. children B. parents C. brothers D. sisters10. A. refuse B. change C. miss D. forget三、阅读理解（共2题；共30分）ADear Miss Hooper,I'm writing to thank you for your help this year．There were lots of subjects(主题)in class，but you made sure that I could understand every one．To tell the truth, you're the best teacher I've met．You explain things so clearly, and are also so kind．I really enjoyed every minute of your class．There were so many best parts this gear．Whatever the subject，you made it fun and interesting to everyone．All of your students found learning new things so easy because of you．I really believe you have a great teaching skill，You should be very proud(自豪的)of the way that you help children learn．It is because of you that I've decided to become a teacher when I grow up．I have mixed feelings about school next year．I'm sad that you won't be my teacher anymore．However, I'm happy that other children will get to share your knowledge(学问)．I'm sure that they'll thank you for your good work．I didn't enjoy school much before this year．I was new to the school this year．At my old school, I found learning quite difficult．The last nine months have changed all of that．I'm now confident(自信的) and looking forward to the next school year．Thank you once again for all of your help．You are really a great teacher and you've helped me greatly．I hope that we can share the same classroom again one day．Yours，Jacob Maclean （1）In Miss Hooper's class，Jacob ．A.heard lots of jokesB.answered questions a lotC.sat in the front of the classroomD.had no difficulty understanding her（2）What does Jacob want to be in the future? （）A.A doctor．B.A teachesC.A scientist．D.A reporter．（3）How does Jacob feel about Miss Hooper's stopping teaching him? （）A.Upset and angry．B.Surprised and angry．C.Upset but understanding．D.Surprised but understanding．（4）At his old school，Jacob ．A.fought a lotB.had few friendsC.was not confidentD.often slept in class（5）Jacob wrote this letter mainly to ?A.say sorry to his teacherB.ask his teacher for helpC.give advice to his teacherD.say thank you to his teacherBMr. Smith made many tests with different animals. They found that the monkey was the cleverest of all the animals. One day Mr. Smith put a monkey in a room. He also put some small boxes in it. In one of the boxes there was some food. “How long will it take the monkey to find the food?” Mr. Smith said to himself. “Let me wait and see.” He left the room and waited outside. Three minutes later, he put his eye to the keyhole (猫眼). What did he see? He saw the eye of the monkey. The monkey was on the other side of the door and looked at Mr. Smith through the keyhole.（1）Mr. Smith made tests with __________.A.different animalsB.the monkey onlyC.all the monkeysD.the cleverest animals（2）There was some food in __________ of the small boxes.A.someB.noneC.oneD.each（3）Mr. Smith put a monkey and some boxes in a room because he wanted to know______.A.how much food monkey could findB.how many boxes the monkey could carryC.how long it would take the monkey to put its eye to the keyholeD.how long it would take the monkey to find the food（4）When Mr. Smith was putting his eye to the keyhole, the monkey was ____________.A.eating foodB.looking for foodC.doing nothingD.looking at Mr. Smith through the keyhole（5）Mr. Smith may be a ________.A.teacherB.scientistC.doctorD.farmer四、翻译，每空一词（共15分）（1）Grandma usually ________ ________ (醒来) early in the morning.（2）The telephone rang but he didn't ________ ________（接电话）.（3）After a while the fire ________ ________（逐渐灭了）.（4）He ________ ________ ________ ________（淋浴）at this time yesterday.（5）Please hurry up. We're ________ ________（等候）you.（6）They're ________ ________（不住在一起）now.（7）从现在开始，这座房子属于你了。
人教版八年级下册英语单元测试卷 Unit 5
Unit 5 What were you doing when the rainstorm came？（满分100）一、单选题（共10小题；每小题2分，满分20分）1.There aren’t many tickets left for the concert, you’d better that you get one today.A. make sureB. make a decisionC. make sure ofD. make plans2.—Why are you late for school, Jack?—Because my alarm didn't . I got up late this morning.A. go offB. go upC. go downD. go away3.We arrived at the station too early and had to go, so we sat there and chatted (聊天)with each other.A.somewhereB.anywhereC.everywhereD.nowhere4.It is far better to read aloud than to read .A.in silenceB.in surpriseC.in EnglishD.in class5.—I’m so tired after the long journey that I want to go to bed at once.—You’d better ____ first and then have a rest.A. take a walkB. take a messageC. take a breakD. take a shower6.In winter, the _____ road makes people fall down easily.A.emptyB.strangeC.icyD.straight7.The phone is ringing. Could you help me ____?A. pick it upB. pick up itC. put it upD. put up it8.The rainstorm is ____ or it may blow down more trees.A. lying downB. taking afterC. dying downD. setting up9.Most water was sent to wash clothes and the rest ____ drink.ed toB.was used toC. were used toD.was used10.We soon the mountains.A.made our ways toB.made way toC.made us way toD.made our way to二、阅读理解（共5小题；每小题4分，满分20分）It was Mother's Day. A man stopped his car at a flower shop to order some flowers. He wanted the shopkeeper to send the flowers to his mother, who lived two hundred miles away.As he got out of his car, he found a young girl sitting on the road crying.He asked her what was wrong and she replied, "I want to buy a red rose for my mother, but I only have seventy-five cents. A rose costs two dollars."The man smiled and said, "Come into the shop with me, and I'll buy you a rose."He bought the little girl her rose and ordered his own mother's flowers. As they were leaving, he offered to drive the little girl home. She said, "Yes, please! You can take me to my mother." She brought him to a cemetery (墓地), where she placed the rose on the grave.The man was moved. He returned to the flower shop, picked up the flowers he ordered, and drove two hundred miles to his mother's house.Send a flower to your kind and beautiful mother on Mother's Day.1. The man went to the shop to _____.A .have a restB. order some flowersC. buy some food2. The man's mother lived _____ away from the flower shop.A. 2 kilometersB. 200 kilometersC. 200 miles3. The girl was crying on the road because _____.A. she was hungryB. she got hurtC. she couldn't afford a rose4. After the man bought the girl a rose, they went to _____ together.A. the cemeteryB. his shopC. the girl's home5. We can learn from the passage that _____.A. the girl loved flowers very muchB. the girl loved her mother very muchC. the shopkeeper sent the flowers to the man's mother三、完形填空（共10小题；每小题2分，满分20分）A traveler was in a large desert, planning to walk across it in one month. Twenty more days passed，the journey had been going on 1 “ Soon I’ll be able to walk out of this desert,” he thought gladly.But the desert was never friendly to travelers. In a short time, there came a strong sandstorm. He hurriedly 2 his head with the clothes, prostrate on the sand.After about ten minutes, the sandstorm stopped. He shook the clothes and stood up. At that moment, he found himself in a hopeless situation—the backpack with food and water was swept away by the 3 .As we know, it seems 4 to leave the desert without food and water. Luckily, he had a pear left. He held it in his hands tightly. “Not too bad, at least I have a pear. I 5 I can walk out of the desert.”Days and nights went by quickly, but the desert still looked endless. Besides, hunger, thirst and fear of 6 were always around him like ghosts. 7 , each time he was close to losing hope, he forced himself to stare at the pear that he had been keeping. "Not too bad, at least I have a pear."A small pear became the 8 for his survival (生存). Three days later, as soon as he saw a village not far away, he laughed with excitement. He felt completely relaxed—the “pear” br ought him back to 9 .To keep hope is the best weapon (武器) for victory, so never tell you “10 left” because only if you try to search, you can always find a “pear” to pull you out of trouble.1. A. well B. badly C. terribly D. heavily2. A. played B. beat C. filled D. covered3. A.snow B. desert C. sandstorm D. smoke4. A. right B. impossible C. safe D. important5. A. believe B. wonder C. remember D. advise6. A. death B. pain C. illness D.sand7 A. Also B. And C.Or D. However8 A. hope B. rule C. question D. plan9. A. danger B. sleep C. life D. mind10. A. anything B. nothing C. something D. everything四、用方框中所给词的适当形式补全短文。
人教版英语八年级下册Unit 5【单元测试卷】(附答案)
人教版英语八年级下册Unit 5【单元测试卷】（附答案）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。
( ) 21. Ann was not at home at that time and her mother wasn’t ________.A。
too B。
either C. also D。
neither（) 22。
—________ were you at the time of the heavy rain?-In the supermarket.A。
What B。
Where C. How D. Which( ) 23。
During our trip, my brother ________ felt ill。
A。
suddenly B. completely C。
recently D。
quietly( ）24. I wonder what happened last night. Please tell me the ________。
A。
dream B。
plan C。
decision D。
truth( ）25。
Peter ________ speaking English at 8:30 yesterday evening.A. is practicingB. practices C。
was practicing D. will practice（) 26. The sun ________ in the east and sets in the west.A。
rises B. travels C。
climbs D。
runs( ) 27. While Alice ________, her sister was playing the piano.A。
cooked B. was cooking C. is cooking D。
cooks（) 28. That’s ________ — the front door is open。
人教版2019-2020年八年级英语下册：单元综合测试卷五(Unit 5)(含答案)
单元综合测试卷五(Unit 5)时间：120分钟满分：120分姓名：分数：听力部分(25分)一、听力。
第一节听小对话，从A、B、C三个选项中选出正确的选项，回答问题。
对话读两遍。
(5分)1.W：Why are you late for school again，Larry？M：I am so sorry，Miss Wang.My alarm didn't go off this morning.2.W：The telephone is ringing.Please pick it up，Jimmy.M：OK，Mom.3.W：What do you think of the program Where Are We Going，Dad？M：It is very interesting and I watch it every Friday.4.W：Take an umbrella with you，Paul.The weather report says it will rainthis afternoon.M：OK，thank you very much.5.W：Could you tell us what happened in the street at 8 p.m. yesterday？M：A car accident.It was terrible.(A)1.Where are the two speakers now？A.In the classroom.B.At home.C.On the bus.(C)2.What will the boy do next？A.Play with the phone.B.Do the homework.C.Answer the phone.(A)3.Which program does the boy watch every Friday？A.Where Are We Going，Dad？B.Sing！China.C.Day Day Up.(B)4.What will the weather be like？A.Sunny.B.Rainy.C.Cloudy.(C)5.When did the accident happen？A.At 4 p.m.B.At 6 p.m.C.At 8 p.m.第二节听长对话，从A、B、C三个选项中选出正确的选项，回答问题。
最新人教版初中数学八年级数学下册第五单元《数据的分析》检测题(有答案解析)
一、选择题1．反映一组数据变化范围的是（ ） A ．极差B ．方差C ．众数D ．平均数2．某市连续10天的最低气温统计如下（单位：℃）：4，5，4，7，7，8，7，6，5，7，该市这10天的最低气温的中位数是（ ） A ．6℃B ．6.5℃C ．7℃D ．7.5℃3．下表记录了甲、乙、丙、丁四名射击运动员最近几次选拔赛成绩的平均数和方差：甲 乙 丙 丁 平均数（环） 9.14 9.15 9.14 9.15 方差6.66.86.76.6根据表中数据，要从中选择一名成绩好且发挥稳定的运动员参加比赛，应选择（ ） A ．甲B ．乙C ．丙D ．丁4．某校有21名同学们参加某比赛，预赛成绩各不同，要取前11名参加决赛，小颖已经知道了自己的成绩，她想知道自己能否进入决赛，只需要再知道这21名同学成绩的( ) A ．最高分B ．中位数C ．极差D ．平均数5．下列说法正确的是（ ）A ．为了解我国中学生课外阅读的情况，应采取全面调查的方式B ．一组数据1、2、5、5、5、3、3的中位数和众数都是5C ．若甲组数据的方差是003，乙组数据的方差是0.1，则甲组数据比乙组数据稳定D ．抛掷一枚硬币100次，一定有50次“正面朝上”6．已知一组数据a ，b ，c 的平均数为5，方差为4，那么数据22a -，22b -，22c -的平均数和方差分别是（ ） A ．8，16B ．10，6C ．3，2D ．8，87．如图是根据我市某天七个整点时的气温绘制成的统计图，则下列说法正确的是（ ）A ．这组数据的众数是14B ．这组数据的中位数是31C ．这组数据的标准差是4D ．这组是数据的极差是98．有甲乙两个箱子,其中甲箱内有98颗球,分别标记号码1～98,且号码不重复的整数,乙箱内没有球。
已知某同学从甲箱内拿出49颗球放入乙箱后,乙箱内球的号码的中位数为40.若此时甲箱内有a颗球的号码小于40,有b颗球的号码大于40,则关于a,b的值,下列选项正确的是( )A．a=15 B．a=16 C．b=24 D．b=359．某校八年级有八个班，一次测试后，分别求得各个班级学生成绩的平均数，它们不完全相同，下列说法正确的是（）A．将八个班级各自的平均成绩之和除以8，就得到全年级学生的平均成绩B．全年级学生的平均成绩一定在这八个班级各自的平均成绩的最小值与最大值之间C．这八个班级各自的平均成绩的中位数就是全年级学生的平均成绩D．这八个班级各自的平均成绩的众数不可能是全年级学生的平均成绩10．为了比较甲乙两足球队的身高谁更整齐，分别量出每人身高，发现两队的平均身高一样，甲、乙两队的方差分别是1.7、2.4，则下列说法正确的是（）A．甲、乙两队身高一样整齐B．甲队身高更整齐C．乙队身高更整齐D．无法确定甲、乙两队身高谁更整齐11．某班体育委员记录了第一小组七位同学定点投篮（每人投10次）的情况，投进篮筐的个数为6，9，5，3，4，8，4，这组数据的众数是（）A．3 B．4 C．5 D．812．下面的统计图表示某体校射击队甲、乙两名队员射击比赛的成绩，根据统计图中的信息，下列结论正确的是（）A．甲队员成绩的平均数比乙队员的大B．乙队员成绩的平均数比甲队员的大C．甲队员成绩的中位数比乙队员的大D．甲队员成绩的方差比乙队员的大二、填空题13．某中学篮球队12名队员的年龄情况如下：年龄（单位：1415161718岁）人数14322则这个队队员年龄的众数和中位数分别是_____岁、_____岁．14．甲、乙两人参加某网站的招聘测试，测试由网页制作和语言两个项目组成，他们各自的成绩（百分制）如下表所示： 应聘者 网页制作 语言 甲 80 70 乙7080该网站根据成绩在两人之间录用了甲，则本次招聘测试中权重较大的是_____项目． 15．若一组数据1，2，a ，3，5的平均数是3，则这组数据的标准差是______. 16．小林同学对甲、乙、丙三个市场某月份每天的白菜价格进行调查，计算后发现这个月三个市场的价格平均值相同，方差分别为2S 7.5=甲，2S 1.5乙=，2S 3.1=丙，那么该月份白菜价格最稳定的是______市场．17．一组数2、a 、4、6、8的平均数是5，这组数的中位数是______．18．为迎接2018年的体育中考，甲、乙两位同学参加排球训练，体育老师根据训练成绩算出他们成绩的方差分别为S 甲2=1.6，S 乙2=2.8，则_____（填“甲”或“乙”）成绩较稳定． 19．已知一组数据的方差s 2=14[（x 1﹣6）2+（x 2﹣6）2+（x 3﹣6）2+（x 4﹣6）2]，那么这组数据的总和为_____．20．一组数据1，3，2，7，x ，2，3的平均数是3，则该组数据的众数为________．三、解答题21．为了了解七年级学生零花钱的使用情况，校团委随机调查了本校七年级部分学生每人一周的零花钱数额，并绘制了如图甲、乙所示的两个统计图（部分未完成），请根据图中信息，回答下列问题：（1）校团委随机调查了多少学生？请你补全条形统计图； （2）表示“50元”的扇形的圆心角是多少度？（3）某地发生自燃灾害后，七年级800名学生每人自发地捐出一周零花钱的一半，以支援灾区恢复生产，请估算七年级学生捐款多少元？22．学校广播站要招聘一名播音员，考查形象、知识面、普通话三个项目（每个项目按百分制计分）．若按形象占10%，知识面占40%，普通话占50%计算加权平均数，作为最后评定的总成绩．李颖和张明两位同学的各项成绩如表所示：项目形象知识面普通话选手李颖708088张明8075x（2）若张明同学要在总成绩上超过李颖同学，求x的范围．23．甲、乙两人在相同条件下各立定跳远5次，距离如下（单位：cm）：甲：225，230，240，230，225；乙：220，235，225，240，230．（1）计算这两组数据的方差；（2）谁的跳远技术较稳定？为什么？24．在“全民读书月”活动中，小明调查了班级里40名同学本学期计划购买课外书的花费情况，并将结果绘制成如图所示的统计图，请根据相关信息，解答下列问题：（直接填写结果）（1）本次调查获取的样本数据的众数是；（2）这次调查获取的样本数据的中位数是；（3）若该校共有学生1000人，根据样本数据，估计本学期计划购买课外书花费50元的学生有人．25．受疫情影响，某地无法按原计划正常开学．在延迟开学期间该地区组织了在线教学活动．开学后，某校针对各班在线教学的个性化落实情况，通过初评决定从甲、乙、丙三个班中推荐一个作为在线教学先进班级，下表是这三个班的五项指标的考评得分表（单位：分）：根据统计表中的信息解答下列问题：（1）请确定如下的“五项指标的考评得分分析表”中的a、b、c的值：（2）如果学校把“课程设置”、“课程质量”、“在线答疑”、“作业情况”、“学生满意度”这五项指标得分按照2∶2∶3∶1∶2的比例确定最终成绩，请你通过计算判断应推荐哪个班为在线教学先进班级？26．某工厂甲、乙两名工人参加操作技能培训．现分别从他们在培训期间参加的若干次测试成绩中随机抽取8次，数据如下（单位：分）．甲9582888193798478乙8375808090859295（1）请你计算这两组数据的平均数、中位数．（2）现要从中选派一人参加操作技能比赛，从统计学的角度考虑，你认为选派哪名工人参加合适？请说明理由．【参考答案】***试卷处理标记，请不要删除一、选择题1．A解析：A【分析】根据极差是刻画数据离散程度的一个统计量．它能反映数据的波动范围大小解答．【详解】解：反映一组数据变化范围的是极差；故选：A．【点睛】本题考查了极差、方差、众数以及平均数的概念和意义，掌握极差是刻画数据离散程度的一个统计量．它能反映数据的波动范围是解题的关键．2．B解析：B【分析】由于10天天气，根据数据可以知道中位数是按从小到大排序，第5个与第6个数的平均数．【详解】解：10天的气温排序为：4，4，5，5，6，7，7，7，7，8， 中位数为：6+72=6.5， 故选B ． 【点睛】本题属于基础题，要明确定义，一些学生往往对这个概念掌握不清楚，计算方法不明确而误选其它选项，注意找中位数的时候一定要先排好顺序，然后再根据奇数和偶数个来确定中位数，如果数据有奇数个，则正中间的数字即为所求，如果是偶数个则找中间两位数的平均数．3．D解析：D 【解析】【分析】首先比较平均数，平均数相同时选择方差较小的运动员参加． 【详解】∵==x x x x >乙丁甲丙， ∴从乙和丁中选择一人参加比赛，∵22S S >乙丁，∴选择丁参赛， 故选D ．【点睛】本题考查了平均数和方差，正确理解方差与平均数的意义是解题关键．4．B解析：B 【解析】共有21名学生参加预赛，取前11名，小颖知道了自己的成绩，我们把所有同学的成绩按大小顺序排列，第11名的成绩是这组数据的中位数，所以小颖知道这组数据的中位数，才能知道自己是否进入决赛．故选B ．5．C解析：C 【分析】可根据调查的选择、中位数和众数的求法、方差及随机事件的意义，逐个判断得结论． 【详解】解：因为我国中学生人数众多，其课外阅读的情况也不需要特别精确， 所以对我国中学生课外阅读情况的调查，宜采用抽样调查，故选项A 不正确； 因为B 中数据按从小到大排列为1、2、3、3、5、5、5，位于中间的数是3，故该组数据的中位数为3， 所以选项B 说法不正确；因为0.003＜0.1，方差越小，波动越小，数据越稳定， 所以甲组数据比乙组数据稳定，故选项C 说法正确；因为抛掷硬币属于随机事件，抛掷一枚硬币100次，不一定有50次“正面朝上”故选项D 说法不正确． 故选：C ． 【点睛】本题的关键在于掌握调查的选择、中位数和众数的求法、方差及随机事件的意义．6．A解析：A 【分析】如果一组的数据的每一个数都扩大或缩小相同的倍数，则平均数也扩大或缩小相同的倍数，方差则扩大或缩小平方倍；如果一组的数据的每一个数都增加或减少相同的数，则平均数也增加或减少相同的数，方差不变． 【详解】根据题意可知：这组数据的平均数为：2×5－2=8；方差为：24216⨯=． 故选：A 【点睛】本题主要考查的是数据的平均数和方差的变化规律，属于中等难度题型．解决这个问题的关键就是要明确变化规律，根据规律进行解答．7．D解析：D 【解析】 【分析】根据中位数，众数、极差、标准差的定义即可判断． 【详解】解：七个整点时数据为：22，22，23，26，28，30，31 所以中位数为26，众数为22，平均数为：22+22+23+26+28+3032167+= ；极差是31-22=9，标准差是：故D 正确， 故选：D 【点睛】此题考查中位数，众数、极差、标准差的定义，解题关键在于看懂图中数据8．A解析：A 【分析】先求出甲箱的球数，再根据乙箱中位数40，得出乙箱中小于、大于40的球数，从而得出甲箱中小于40的球数和大于40的球数，即可求出答案. 【详解】解:∵甲箱98−49=49(颗)，∵乙箱中位数40，∴小于、大于40各有(49−1)÷2=24(颗)，∴甲箱中小于40的球有39−24=15(颗),大于40的有49−15=34(颗)，即a=15，b=34.故选：A【点睛】本题考查了中位数，正确进行分析，掌握中位数的概念是解题的关键.9．B解析：B【分析】A、由于这八个班的人数不一定相等，故全年级学生的平均成绩应等于所有学生成绩的和除以学生人数；B、由于全年级学生的平均成绩等于所有学生成绩的和除以学生人数，故全年级学生的平均成绩一定在这八个平均成绩的最小值与最大值之间；C、由于这八个班的人数不一定相等，故这10个平均成绩的中位数不一定是全年级学生的平均成绩；D、众数是一组数据中出现次数最多的数，能反映数据的集中程度，平均数也能反映数据的集中程度，是有可能相等的．【详解】A、全年级学生的平均成绩应等于所有学生成绩的和除以学生人数，而这八个班的人数不一定相等，故错误；B、由于全年级学生的平均成绩等于所有学生成绩的和除以学生人数，故全年级学生的平均成绩一定在这八个平均成绩的最小值与最大值之间，故正确；C、中位数不一定与平均数相等，故错误；D、众数与平均数有可能相等，故错误．故选B．【点睛】本题考查了平均数、中位数、众数的关系，它们有可能相等，也可能不相等．10．B解析：B【解析】【分析】根据方差的意义可作出判断，方差是用来衡量一组数据波动大小的量，方差越小，表明这组数据分布比较集中，各数据偏离平均数越小，即波动越小，数据越稳定．【详解】∵S2甲=1.7，S2乙=2.4，∴S2甲＜S2乙，∴甲队成员身高更整齐；故选B.【点睛】此题考查方差，掌握波动越小，数据越稳定是解题关键11．B解析：B【解析】【分析】众数是出现次数最多的数，据此求解即可．【详解】∵数据4出现了2次，最多，∴众数为4，故选：B．【点睛】本题考查了众数的知识，解题的关键是了解有关的定义，属于基础题，难度不大．12．D解析：D【解析】【分析】根据平均数、中位数和方差的计算公式分别对每一项进行分析，即可得出答案．【详解】甲队员10次射击的成绩分别为6，7，7，7，8，8，9，9，9，10，则中位数882=8，甲10次射击成绩的平均数=（6+3×7+2×8+3×9+10）÷10=8（环），乙队员10次射击的成绩分别为6，7，7，8，8，8，8，9，9，10，则中位数是8，乙10次射击成绩的平均数=（6+2×7+4×8+2×9+10）÷9=8（环），甲队员成绩的方差=110×[（6-8）2+3×（7-8）2+2×（8-8）3+3×（9-8）2+（10-8）2]=1.4；乙队员成绩的方差=110×[（6-8）2+2×（7-8）2+4×（8-8）3+2×（9-8）2+（10-8）2]=1.2，综上可知甲、乙的中位数相同，平均数相同，甲的方差大于乙的方差，故选D．【点睛】本题考查了平均数、中位数和方差的定义和公式，熟练掌握平均数、中位数、方差的计算是解题的关键.二、填空题13．1615【分析】根据中位数和众数的定义求解【详解】解：从小到大排列此数据数据15出现了四次最多为众数16和16处在第5位和第六位它两个数的平均数为16为中位数故答案为：1615【点睛】本题属于基础题解析：16 15【分析】根据中位数和众数的定义求解．【详解】解：从小到大排列此数据，数据15出现了四次最多为众数，16和16处在第5位和第六位，它两个数的平均数为16为中位数．故答案为：16，15．【点睛】本题属于基础题，考查了确定一组数据的中位数和众数的能力．注意找中位数的时候一定要先排好顺序，然后再根据奇数和偶数个来确定中位数，如果数据有奇数个，则正中间的数字即为所求，如果是偶数个则找中间两位数的平均数．14．网页制作【分析】根据加权平均数的定义解答即可【详解】解：设网页制作的权重为a语言的权重为b则甲的分数为80a+70b乙的分数为70a+80b而甲的分数高所以80a+70b＞70a+80b解得a＞b则解析：网页制作【分析】根据加权平均数的定义解答即可．【详解】解：设网页制作的权重为a，语言的权重为b，则甲的分数为80a+70b，乙的分数为70a+80b，而甲的分数高，所以80a+70b＞70a+80b，解得a＞b，则本次招聘测试中权重较大的是网页制作项目．故答案为：网页制作．【点睛】本题考查了加权平均数的和解一元一次不等式的知识，属于基础题型，熟练掌握加权平均数的定义是关键.15．【分析】根据题意可得×(1+3+2+5+a)=3解这个方程就可以求出a的值；根据标准差的计算公式即可求出样本标准差【详解】根据题意由平均数的定义得×(1+3+2+5+a)=3解得a=4所以方差为：S【分析】根据题意可得15×(1+3+2+5+a)=3，解这个方程就可以求出a的值；根据标准差的计算公式即可求出样本标准差.【详解】根据题意由平均数的定义得15×(1+3+2+5+a)=3，解得，a=4.所以方差为：S 2=()()()()()2222213-1+3-3+3-2+3-5+3-4=5⎡⎤⨯⎣⎦2，.【点睛】此题考查平均数的概念，解题关键在于掌握计算公式.16．乙【分析】根据方差的定义方差越小数据越稳定即可得出答案【详解】该月份白菜价格最稳定的是乙市场；故答案为乙【点睛】本题考查了方差的意义方差是用来衡量一组数据波动大小的量方差越大表明这组数据偏离平均数越 解析：乙【分析】根据方差的定义，方差越小数据越稳定，即可得出答案．【详解】2S 7.5=甲，2S 1.5乙=，2S 3.1=丙，222S S S ∴>>甲乙丙，∴该月份白菜价格最稳定的是乙市场；故答案为乙．【点睛】本题考查了方差的意义.方差是用来衡量一组数据波动大小的量，方差越大，表明这组数据偏离平均数越大，即波动越大，数据越不稳定；反之，方差越小，表明这组数据分布比较集中，各数据偏离平均数越小，即波动越小，数据越稳定．17．5【解析】【分析】由平均数可求解a 的值再根据中位数的定义即可求解【详解】解：由平均数可得a=5×5-2-4-6-8=5则该组数由小至大排序为：24568则中位数为5故答案为：5【点睛】本题考查了平均解析：5【解析】【分析】由平均数可求解a 的值，再根据中位数的定义即可求解.【详解】解：由平均数可得，a=5×5-2-4-6-8=5，则该组数由小至大排序为：2、4、5、6、8，则中位数为5，故答案为：5.【点睛】本题考查了平均数和中位数的概念.18．甲【分析】根据方差的意义即方差越小波动越小方差越大波动越大解答【详解】∵<∴甲稳定【点睛】本题考查的知识点是方差解题的关键是熟练的掌握方差解析：甲【分析】根据方差的意义，即方差越小波动越小，方差越大波动越大解答．【详解】∵2S甲<2S乙，∴甲稳定.【点睛】本题考查的知识点是方差，解题的关键是熟练的掌握方差.19．24【分析】根据方差公式S2=（x1﹣）2+（x2﹣）2+…+（xn﹣）2中各个字母表示的意义得出这组数据的平均数是6数据个数是4从而得出这组数据的总和【详解】∵s2=（x1﹣6）2+（x2﹣6）2解析：24【分析】根据方差公式S2=1n[（x1﹣x）2+（x2﹣x）2+…+（x n﹣x）2]中各个字母表示的意义，得出这组数据的平均数是6，数据个数是4，从而得出这组数据的总和．【详解】∵s2=14[（x1﹣6）2+（x2﹣6）2+（x3﹣6）2+（x4﹣6）2]，∴这组数据的平均数是6，数据个数是4，∴这组数据的总和为4×6=24．故答案为24．【点睛】本题考查了方差的定义：一般地设n个数据，x1，x2，…x n的平均数为x，则方差S2=1n[（x1﹣x）2+（x2﹣x）2+…+（x n﹣x）2]．20．3【分析】首先根据这组数据的总和等于各个数据之和或等于这组数据的平均数乘以这组数据的个数列出方程得出x的值再根据众数的概念这组数据中出现次数最多的是3从而得出答案【详解】解:1+3+2+7+x+2+解析：3【分析】首先根据这组数据的总和等于各个数据之和，或等于这组数据的平均数乘以这组数据的个数，列出方程，得出x的值，再根据众数的概念，这组数据中出现次数最多的是3，从而得出答案.【详解】解: 1+3+2+7+x+2+3=3×7解得：x=3,这组数据中出现次数最多的是3，故该组数据的众数为3.故答案为3.点睛: 本题考查的是平均数和众数的概念．注意一组数据的众数可能不只一个.三、解答题21．（1）40；补图见详解；（2）36°；（3）13200元．【分析】（1）用捐款40元的人数除以所占百分比即可求出调查的学生数，用调查的学生数乘以15%求出捐款20元的学生数，不去统计图即可；（2）用捐款50元的学生人数除以调查总人次再乘以360°即可求解；（3）计算出本次调查的平均数，再根据题意列式计算即可求解．【详解】解：（1）10÷25%=40（人），40×15%=6（人），∴校团委随机调查了40名学生，补全条形统计图如图：（2）表示“50元”的扇形的圆心角为4360=36 40⨯︒︒；（3）206302040105041800=13200402⨯+⨯+⨯+⨯⨯⨯（元），答：七年级学生捐款约为13200元．【点睛】本题考查了条形统计图与扇形统计图，用样本估计总体，加权平均数等知识，根据条形统计图和扇形统计图的关联量求出各组数据是解题关键．22．（1）83；（2）90＜x≤100【分析】（1）按照各项目所占比求得总成绩；（2）各项目所占比求得总成绩大于83分即可，列出不等式求解．【详解】（1）70×10%+80×40%+88×50%=83（分）；（2）80×10%+75×40%+50%•x＞83，∴x ＞90．∵每个项目按百分制计分∴90＜x≤100∴李颖同学的总成绩是83分，张明同学要在总成绩上超过李颖同学，则他的普通话成绩应90＜x≤100．【点睛】本题综合考查平均数的运用．解题的关键是正确理解题目的含义．23．（1）30；50（2）甲稳定；见解析．【分析】（1）根据平均数的计算公式先求出甲和乙的平均数，再代入方差公式()()()2221221=.....n S x x x x x x n ⎡⎤-+-++-⎢⎥⎣⎦，进行计算即可得出答案； （2）根据方差的意义，方差越小数据越稳定，即可得出答案．【详解】 解：（1）甲的平均数是：()1225+230+240+230+225=2305cm ⨯， 乙的平均数是：()1220+235+240+230+225=2305cm ⨯， 甲的方差是：()()()()()22222221=225230230230240230230230225230305S cm ⎡⎤⨯-+-+-+-+-=⎣⎦， 乙的方差是：()()()()()22222221=220230235230240230230230225230505S cm ⎡⎤⨯-+-+-+-+-=⎣⎦；（2）由（1）知，S 甲2＜S 乙2，∴甲的跳远技术较稳定．【点睛】本题主要考查平均数与方差，熟练掌握方差及平均数的运算公式是解题的关键．24．（1）30元；（2）50元；（3）250．【分析】（1）根据众数的定义即可判判断；（2）根据中位数的定义即可判断；（3）先计算出样本中计划购买课外书花费50元的学生所占的比例，然后在乘以总人数即可；【详解】（1）花费30元的有12人，最多，故众数是30元；（2）一共有40个数据，排序后第20、21个数据的平均数即是中位数，6+12=18<20，6+12+10=28>20，故第20、21个数据都是50元，故中位数是50元；（3）10÷40×2400=600（人），故估计本学期计划购买课外书花费50元的学生有50人． 25．（1）a =10，b =8，c =8.6；（2）推荐丙班级为网上教学先进班级．【分析】（1）直接根据中位数、众数、平均分的概念即可求解；（2）先根据各项得分的权重求得各班的最终成绩，然后比较即可判断．【详解】解：（1）∵甲班的五项指标得分由小到大重新排列为：6、7、10、10、10∴甲班的中位数为：10分；∵乙班的五项指标得分为：10、8、8、9、88分出现次数最多，∴乙班的众数是：8分；∵（9+10+8+7+9）÷5=8.6（分），∴丙班的平均分是：8.6分；∴a =10，b =8，c =8.6．（2） 甲：10×20%＋10×20%＋6×30%＋10×10%＋7×20%=8.2（分）乙：10×20%＋8×20%＋8×30%＋9×10%＋8×20%=8.5（分）丙：9×20%＋10×20%＋8×30%＋7×10%＋9×20%=8.7（分），∴推荐丙班级为网上教学先进班级．【点睛】此题主要考查数据的统计和分析，正确理解每个概念是解题关键．26．（1）甲、乙两组数据的平均数都是85分，中位数分别为83分、84分；（2）派乙参赛更合适．理由见解析．【分析】（1）根据平均数、中位数的计算方法分别计算即可；（2）从平均数、中位数、方差以及数据的变化趋势分析．【详解】()1()19582888193798478858x =+++++++=甲（分），()18375808090859295858x =+++++++=乙 将甲工人的测试成绩从小到大排序，处在第45、位的平均数为()8284283+÷=（分）， 因此甲工人测试成绩的中位数是83分，将乙工人的测试成绩从小到大排序，处在第45、位的平均数为()8385284+÷=（分）， 因此乙工人测试成绩的中位数是84分，答：甲、乙两组数据的平均数都是85分，中位数分别为83分、84分．()2(答案不唯一，合理即可) ()()()2222195858285...788535.58S =-+-+⎤⎣⎦=⎡+-甲(分2)()()()2222183857585...9585418S =-+-+-⎡⎤⎣⎦+=乙(分2) ①从平均数看，甲、乙均为85分，平均水平相同;②从中位数看，乙的中位数大于甲，乙的成绩好于甲;③从方差来看，因为22S S <甲乙，所以甲的成绩较稳定;④从数据特点看，获得85分以上(含85分)的次数，甲有3次，而乙有4次， 故乙的成绩好些;⑤从数据的变化趋势看，乙后几次的成绩均高于甲，且呈上升趋势，因此乙更具潜力. 综上分析可知，甲的成绩虽然比乙稳定，但从中位数、获得好成绩的次数及发展势头等方面分析，乙具有明显优势，所以派乙参赛更合适.【点睛】考查平均数、中位数、方差的意义及计算方法，从多角度分析数据的发展趋势是一项基本的能力．。
八年级下册第五单元综合素质检测
八年级下册第五单元综合素质检测
第一部分：选择题
1. 下列哪项不是主持人在主持会议时应该做的事情？
A. 仔细准备会议的流程和内容
B. 保持中立并公正地引导会议
C. 持续发表自己的观点并占据话语权
D. 注意观察会议氛围并调节气氛
2. 在会议现场，参会人员之间发生争执如何处理？
A. 尽力化解矛盾，避免会议无法进行
B. 拉拢一些人力挺自己的观点，争取更多支持
C. 盲目坚持自己的观点，不顾和解
D. 为了维护自己的形象，强迫他人接受自己的观点
3. 在日常生活中，我们应该怎样与他人进行良好的沟通？
A. 只重视自己的意见和看法，不理会他人的感受和需求
B. 多倾听别人的意见，尊重他人的观点
C. 独断专行，不和别人讨论问题
D. 为了表现自己，强行把自己的观点灌输给他人
1. ___________ 、___________以及__________等都是会议中需要注意的细节。
2. 会议现场，主持人需要维持会议的__________，保持__________和热情，让会议的气氛____________。
3. 在与他人进行沟通时，我们应该倾听他人的意见，尊重_____________。
1. 你觉得在主持会议时，主持人应该具备哪些素质？
2. 你在日常生活中是如何与他人进行良好的沟通的？
以上就是八年级下册第五单元综合素质检测的部分内容，希望同学们认真对待这次检测，从中发现自己的不足，努力提高自己的素质。
2020年春人教版八年级英语下册 Unit 5 单元测试 (Word版包含答案)
Unit 5 What were you doing when the rainstorm came? 单元测试姓名：__________ 班级：__________ 学号：__________一、单选题（共15题；共30分）1.After dinner, I finished the rest _____ my homework.A. ofB. forC. fromD. to2.The big building was _____ down last week.A. takeB. tookC. takenD. taking3.Don't look out _____ the window when you are in the car. It's dangerous.A. inB. ofC. forD. with4.I have trouble _____ English. I need help.A. learnB. learntC. learningD. to learn5.I remember _____ my homework to school. But now I can't find it.A. takeB. takesC. to takeD. taking6.He likes to buy a cup of coffee when he walks _____ the coffee shop.A. atB. onC. withD. by7.— I heard the river kept _____ near the town.— Yes. So we had to leave.A. risingB. raisingC. roseD. raised8.Mr. Miller fell ill and went to hospital．At that time he the importance of health．A. imaginedB. wonderedC. realizedD. discussed9.While my father was reading a newspaper, my mother a soap opera．A. will watchB. was watchingC. watchesD. is watching10.I remember my cup on the table，but I can't find it now．A. to putB. to puttingC. puttingD. put11.Bill，I planned to give you the card on Saturday, but I forgot．A. completelyB. recentlyC. quietlyD. clearly12. Sam came to visit me，I was cooking dinner in the kitchen．A. WhileB. UntilC. AfterD. When13.—Why did they the houses?—Because they will build a park there．A. take downB. write downC. cut downD. turn down14.My sister doesn't like listening to pop music，because she has trouble the words．A. understandB. understandingC. spellD. spelling15.一I heard Frank would join the music club．一He's not interested in music at all．A. Why not?B. No problem．C. You’re kidding!D. It\s up to you．二、完形填空（共10分）One morning，Sue was riding her bike to school. She was late，so she decided to take a short cut（捷径）. But she made a mistake and 1 into a one-way street. The street was not very 2 . A car was coming from the other direction. The driver quickly drove to one side and drove into a shop window. The shop assistant was greatly 3 ! There was 4 everywhere. Sue rode into the other side of the street and 5 a man, then an apple cart. The apple cart turned over and the apples went in all directions.A group of students were having 6 in a small restaurant. Quickly they ran 7the street. With their help, all the apples were 8 and put back on the cart. Luckily, 9 Sue nor the driver of the cart was hurt. A policeman came by and saw what happened. He 10 Sue from riding to school and asked her some questions, so Sue was even later for school.1. A. walked B. looked C. turned D. drove2. A. wide B. narrow C. long D. deep3. A. glad B. interested C. hungry D. frightened4. A. grass B. glass C. trouble D. dirty5. A. touched B. hit C. kicked D. pulled6. A. breakfast B. lunch C. supper D. picnic7. A. back B. from C. away D. across8. A. broken B. picked up C. carried D. thrown away9. A. both B. either C. neither D. none10. A. helped B. took C. sent D. stopped三、阅读理解（共2题；共20分）（一）One day a poor farmer was taking a bag of rice to the town. Suddenly the bag fell down from his horse on the road. He didn't know what to do about it because it was too heavy for him to lift (举起) it by himself. He only hoped that somebody would soon pass (经过) by and help him.Just at this moment a man riding a horse came up to him. But the farmer was very disappointed(失望的)when he saw who he was. It was the great man living nearby. The farmer had hoped to ask another farmer or a poor man like him for help.But to his surprise, the great man got off his horse as soon as he came near. He said to the farmer, "I see you need help, my friend. How good it is that I'm here just at the right time！" Then he took one end of the bag, the farmer took the other. They together lifted it and put it on the horse."Sir, " asked the farmer, "how can I pay you？""It's quite easy, " the great man answered with a smile, "Wherever (无论在哪里) you see anyone in trouble, do the same for him. "（1）What happened when the farmer went to town? （）A.His horse's leg was hurt.B.The bag fell down from his horse.C.The farmer lost his bag.D.His bag was stolen.（2）The farmer didn't lift the bag onto the horse by himself because ________.A.the bag was brokenB.the horse went awayC.the bag was too heavyD.the farmer was ill（3）Why was the farmer disappointed when he saw the great man? Because he thought the great man ________.A.couldn't see himB.could take away his bagC.could take away his horseD.couldn't help him（4）Who helped the farmer? （）A.A great man.B.Another farmer.C.A poor man.D.A friend.（5）What does the story mainly (主要地) tell us? （）A.Everybody should become a great man.B.We should help the man who is in trouble.C.Everybody couldn't learn from the farmer.D.We should pay for others' help.（二）It was about 1：00 in the morning. It was bright light in my neighbor's kitchen. I thought he might be having midnight food so I went back to my bed. Soon, there was a burning smell and I realized there must be something wrong. I jumped out of bed at once and went to have a look. I saw fire coming out of his kitchen. I shouted, "Fire！Fire！"But nobody heard me. I ran quickly to my house and called the Fire Department(消防队) and went back to my neighbor's house.I knocked at the door and called my neighbor's name, but there was no answer. I tried to break into the house and saved a cat and a chicken. Then I poured water through the kitchen window but it was no use, because the fire was too big. Luckily, the firemen arrived and put out the fire in time.When my neighbor came back, he was sad because his kitchen was burnt down, but he thanked me for calling the Fire Department and saving his pets.A week later, my neighbor invited me to his home for dinner. In his new kitchen, he took a photo of me. Later on, he gave me the photo as a gift. It made me happy.（1）When the writer saw the light in his neighbor's kitchen, he thought his neighbor was ________.A.cookingB.drinking waterC.playingD.doing the dishes（2）What did the writer do first after he saw fire coming out of his neighbor's kitchen? （）A.He shouted for help.B.He ran into his house quickly.C.He called the Fire Department.D.He knocked at his neighbor's door.（3）The writer's neighbor kept ________ as pets according to the text.A.a dog and a catB.a cat and a birdC.a dog and a birdD.a cat and a chicken（4）Which of the following is TRUE according to the text? （）A.The writer put out the fire at last.B.The neighbor was at home when the fire happened.C.The neighbor invited the writer to have dinner.D.The writer took a photo with his neighbor in his new kitchen.（5）We can know from the text that the writer is ________.A.outgoingB.famousC.helpfulD.hard-working四、翻译（共10分）1.史密斯夫妇沉默无语地走了一会儿。
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八年级《思想品德》第五单元生活在法律的保护中班级：学号：姓名：分数：
一、选择题（本题共20小题，每小题2分，共40分。
各题只有一个正确答案）
1、我国第一部保护未成年人身心健康、保障未成年人合法权益的法律是（）
A、未成年人保护法
B、义务教育法
C、妇女儿童权益保障法
D、预防未成年人犯罪法
2、国家有关部门设立“12369”环境污染举报电话，依法严肃查处侵害公民环境合法权益的案件，
这说明有我国（）
①法律保护公民的合法权益②侵害公民正当权益的行为要受法律惩处③公民在合法权益受侵害
时可以任意处置不法侵害人④保护环境是我们国家一切工作的中心
A、①②
B、③④
C、①③
D、②④
3、我国的《未成年人保护法》的特殊保护的对象是（）
A、广大的青少年
B、全体中小学生
C、未满18周岁的我国公民
D、少先队员和共青团员
4、在我国现实生活中，法律与每个人息息相关。
正因为有了法律的保护（）
①社会才能正常和谐地发展②公平、正义和秩序才能得到维护③公民才能真正享有其合法的权利
④领导干部才能拥有法律以外的特权
A、①②③
B、①②④
C、①③④
D、②③④
5、我们国家法律对未成年人予以特殊保护，所以（）
A、未成年人犯罪不用承担法律责任
B、成年人不能对未成年人进行批评教育
C、未成年人只享受权利不需要履行义务
D、危害未成年人健康成长的行为要受法律制裁
6、某法院不公开开庭审理了一起少年团伙抢劫案件。
之所以要不公开，因为（）
A、这是一起抢劫案
B、这是一起团伙犯罪案
C、这是一起未成年人犯罪案
D、这是由法院审理的刑事案
7、我国制定《预防未成年人犯罪法》的目的在于（）
①保障未成年人的身心健康②培养未成年人的良好品德③从重处罚未成年人的犯罪嫌疑人④有
效预防未成年人的犯罪
A、①②③
B、①②④
C、①③④
D、②③④
8、家庭对于未成年人的健康成长发挥着重要的作用，体现在（）
①家庭是未成年人的第一所学校②父母是未成年人的第一老师③家庭筑起了预防未成年人犯罪的第一防线④家庭是唯一没有侵害未成年人权益行为的场所
A、①②③
B、①②④
C、①③④
D、②③④
9、从现代眼光看，“曾参杀猪”“岳母刺字”等典故中的家长主要是（）
A、履行了抚养子女的义务
B、履行了教育子女的职责
C、尊重了子女受教育的权利
D、做到了满足子女的任何要求
10、根据国家有关部门的通知要求，我国文化、文物系统的各级博物馆、纪念馆、美术馆对未成年人集体参观实行免票，对学生个人参观实行半票，这体现了我国对未成年人的（）
A、家庭保护
B、学校保护
C、社会保护
D、司法保护
11、某营业性网吧的门口悬挂着“禁止未成年人进入”的牌子。
这一做法（）
A、是错误的，因为这违背了法律面前人人平等的原则
B、是错误的，因为这不利于青少年学习掌握现代科技
C、是正确的，因为这有利于网吧扩大经营增加营业收入
D、是正确的，因为这有利于保护未成年人的健康成长
12、小尹才读初二，学习成绩一般，父母认为他继续读书没有希望，及早赚钱才是实惠的事，于是决定把小尹送到外地打工挣钱。
面对这种情况，小尹正确的做法是（）
①听从父母安排，外出打工挣钱②向父母宣传《九年制义务教育》③向父母保证今后努力学习、不断进步④请求老师或学校帮助，依法维护自己的合法权利
A、①②③
B、①②④
C、①③④
D、②③④
13、在未成年人保护方面，学校担负的职责是（）
①依法进行德智体等方面的教育②依法履行监护职责和抚养义务③保护未成年学生的人身安全和健康④关心爱护学生，尊重学生的人格尊严
A、①②③
B、①②④
C、①③④
D、②③④
14、杨思今年15岁，因没考上高中，就到舅舅开的理发店去打工，舅舅每月给她700元工资。
谁知她舅舅因此被有关部门查处罚款。
其原因解释正确的是（）
A、杨思应当接受九年义务教育
B、杨思劳动应当得到合理报酬
C、我国法律禁止非法使用童工
D、我国对违法行为一律处于罚款
15、我国司法机关在审理未成年人案件中，应当（）
①坚持教育为主、惩罚为辅的原则②坚持教育、感化、挽救的方针③维护未成年人不受法律制约的特权④尊重违法犯罪未成年人的人格尊严
A、①②③
B、①②④
C、①③④
D、②③④
16、许多小店让未成年的孩子当服务员，店主的做法是（）
A、保障了未成年人劳动的权利
B、督促未成年人履行了劳动的义务
C、有利于未成年人身心的健康发展
D、侵犯了未成年人的合法权益
17、未成年人小甲上学途中不走斑马人行横道，擅自翻越护栏，乱穿马路，以至发生车祸，造成身体伤残。
我们未成年人从小甲身上应吸取的教训是（）
A、自觉守法，注意人身安全
B、锻炼身体，提高自护能力
C、勇于和善于同犯罪分子作斗争
D、学会打官司，运用法律维权
18、根据律师的职责，我们可以从律师那里得到的帮助主要有（）
①有关法律问题的咨询②遭遇侵害后缉拿犯罪嫌疑人③违法犯罪后逃避法律惩处④遭遇法律纠
纷时代理诉讼事宜
A、①②③
B、①②④
C、①③④
D、②③④
19、根据我国的法律援助制度，如果公民经济上确有困难，一般遇到下列哪些案件都有可能获得法律援助（）
①涉及公民民主权利的案件②涉及公民人身健康的案件③涉及公民人身安全的案件④一般的民
事经济纠纷案件
A、①②③
B、①②④
C、①③④
D、②③④
20在现实生活中，未成年人必须加强自我保护，为此应当做到（）
①经常保持一定的警惕性②学习一些自我保护的技巧和方法③不去陌生的地方，不和陌生人搭话④依法自律，不做法律不允许做的事
A、①②③
B、①②④
C、①③④
D、②③④
二、非选择题（共60分）
21、指出下列情形下应拨打的求助电话。
（10分）
A、老人突发心脏病_______________
B、某宿舍发生火灾_____________
C、小偷撬门进来行窃_____________
D、在商店买到伪劣商品_______________
E、摩托车与自行车相撞________________
22、简要回答：为什么我们未成年人需要国家法律的特殊保护？（10分）
23、为加强校园文明建设，培养青少年良好的思想道德品质，某校电视台公开曝光一些初中学生违纪的不文明行为。
你认为这一做法可取吗？为什么？（12分）
24、14岁的初二学生张某迷恋上网，严重厌学。
网吧业主与张某签订合同，让张某每晚7点至10点到网吧服务，付报酬2元，但允许其空闲时免费上网娱乐。
一个月后，张某因向网吧业主索要报酬不给，两人争执，张某情急之下推倒了一台电脑，业主叫人将张某关绑在楼上，要其赔偿。
张某为了脱身，从窗户入爬出去，不慎跌落、摔伤。
请回答（16分）
⑴请从法律的角度简要评析网吧业主的行为。
⑵张某从自身的过错中应当吸取什么教训？
25、去年某市各级妇联接到有施暴行为的投诉396件，比上年件。
受害者多为妇女儿童，许多妇女儿童被打得鼻青脸肿，有的还被戳伤双眼，拗断手臂，劈下耳朵，击伤头部。
但受家丑不可外扬传统思想的束缚，受害者中，70%的妇女儿童没有依法采取维权措施，结果导致司法介入存在一定难度。
阅读材料请回答（12分）
⑴你觉得有这么多的家庭暴力存在，主要有哪些原因？
⑵当遇到此类事件时，可以通过哪些途径来维护自己的合法权益？
参考答案
一、选择题
１２３４５６７８９１
０
A A C A D C
B A B C
１１
１
２
１
３
１
４
１
５
１
６
１
７
１
８
１
９
２
０
D D C C B D A C A B
二、问答题
21、A－120B－119C－110D－12315E－122
22、因为我们未成年人处在长身体、长知识的重要时期，社会经验相对缺乏，辨别是非能力不强，自我保护能力较弱，自身的合法权利受到不法侵害时往往还意识不到，所以需要国家法律的特殊保护。
23、不可取。
因为尽管学校的出发点是好的，但这一做法是不合法的，因为它违反了法律对未成年人保护的规定，侵害了未成年人的人格尊严，影响了他们的健康成长，。
24、⑴网吧业主允许未成年人进入网吧，雇佣未满16周岁的未成年人打工，都违反了我国有关法律对未成年人保护的规定；后将张某绑缚、关押侵害了公民的人身自由权利，也是违法的。
⑵要增强法制观念，在法律许可的范围内行使自己的权利，认真履行相关义务，依法自律，以加强自我保护。
25、⑴一些侵害人法律意识淡薄，不懂法；一些被侵害人也不懂法，不知道可以用法律武器维护自己的合法权益；受家丑不可外扬等传统观念的影响，受害人不坚决斗争，纵容了侵害人。
⑵及时报警；请律师，打官司；寻求法律援助；向新闻媒体反映，争取社会舆论支持；等等。