中考易错单项填空题100例
物质构成的奥秘易错题
中考化学易错题--物质构成的奥秘一、选择题：1、极少数青少年有吸烟的恶习，香烟的主要成份很复杂，经燃烧产生的烟气中含有许多强致癌物质和有害物质，其中对人体危害最大的是尼古丁(化学式为C10H14N2)、焦油、一氧化碳等，下列说法没有错误的是（）A．吸烟严重危害人的身心健康 B．尼古丁由碳、氢、氮3个元素组成 C．尼古丁分子中共有26个原子 D．尼古丁中C：H：N相对质量比=10：14：22、下图形象地表示某反应前后反应物与生成物分子及其数目的变化，其中“”、“”、“”，分别表示A、B、C三种不同的分子。
该反应的化学方程式中A、B、C前的化学计量数之比为：A、4：1：3B、3：1：2C、4：1：2D、3：1：3【解析】比较反应前后两幅示意图可知，参加反应的A分子数为3（1个A分子未参加反应），参加反应的Y分子数为1，生成C的分子数为2。
化学方程式为3A＋B＝2C。
答案：B。
【易错题点睛】由图所提供的信息可知：反应前A分子的个数是4个，B分子的个数是1个；反应后A分子剩余1个并生成2个C分子。
所以实际反应的A分子是3个，因此该反应为3A + 2B = 2C，即化学方程式中A、B、C前的化学计量数之比为3：1：2。
没反应的分子不能计算在内，可以将反应前后相同的分子划掉。
3、下列说法正确的是（）A.具有相同质子数的微粒属于同一种元素B.相同元素的原子原子核一定相同C.一种元素变成另一种元素，一定变化的质子D.化学变化的过程中元素的种类一定变化【解析】具有相同质子数的同一类原子属于同一种元素，比如水分子和氖原子质子数都为10，不能说这样的微粒属于同一种元素，所以A错；同种元素的原子质子数相同但中子数可以不同所以原子核不一定相同，比如氕、氘、氚，故B 错。
根据质量守恒定律，化学变化前后元素的种类不变，故D错。
【易错题点睛】选项A是学生最易混淆的概念，同种元素的质子数相同，但质子数相同的微粒不一定是同种元素；同种元素的原子质子数相同但中子数可以不同所以原子核不一定相同；化学变化前后元素的种类不变；所以只有选项C 正确。
人教版初中数学经典易错题100例
人教版初中数学经典易错题100例1. 顺序填空1. 4的连续两个因数的和是______。
2. 素数有自己和1以外的两个因数。
3. 3/7+ 5/7 = ______。
4. 5/8 - 3/8 = ______。
2. 选择1. 小明从家到学校一共走了420米，他先走了180米，再走了220米，最后又走了______米。
A. 20B. 30C. 40D. 502.一个矩形的长是宽的4倍，如果宽是6厘米，则它的长是______厘米。
A. 18B. 20C. 24D. 363. 2 × (3 + 4) ÷ 6 = ______。
A. 2B. 3C. 4D. 94. 1 ÷ (3 × 4 ⁄ 6) = ______。
A. 0.5B. 1C. 2D. 63. 解方程1. 已知某数的 5 倍再加上 8 的结果等于 33，那这个数是______。
2. 已知某数加上 7 的结果再乘以 4 等于 72，那这个数是______。
4. 填空1. 已知一天有24小时，一小时有60分钟，那一天有______分钟。
2. 世界人口有70亿人，其中中国人口占世界人口的1/______。
3. 某商品原价100元，打八折后的价格是______元。
4. 小华和小明比赛跑步，小华跑了600米，小明跑了600米，小华比小明多跑了______米。
5. 判断对错判断下列各题的对错，对的打“√”，错的打“×”。
1. 加法交换律是指：两数相加，其结果与加数的顺序无关。
2. 减法可交换两个减数的位置，结果不变。
3. 一个合有1个相同数字的偶数，它可以分解为两个质数相加。
4. 如果两个数的乘积为1，这两个数一定相等。
6. 简答题1. 对折一张纸后再展开，将对象折痕对称轴，纸上任何一点到对称轴的距离相等，这句话描述的是：______。
2. 有一张纸条，它的长度是宽度的5倍，它的面积是宽度的______倍。
九年级上册英语期中复习易错题整理(含答案)
九年级上册英语期中复习易错题整理(含答案)1.Some students don't know how to deal with stress before taking an exam.2.---There is something wrong with my bike。
I'll have it XXX.Why not have Uncle Li repair it?3.---You caught the early bus。
didn’t you?Yes。
I did。
though I tried my best.4.---English is very important。
so don’t give it up.Thank you。
I won’t.5.---Tom XXX XXX.It isn’t a good habit.6.We are much sure to win against any trade war in our country。
一、单项填空：1.有些学生不知道应该如何在考试前处理压力。
2.---我的自行车出了点问题。
我明天去修。
为什么不让XXX呢？3.---你赶上早班车了，对吧？是的，尽管我尽力了。
4.---英语很重要，所以不要放弃。
谢谢，我不会放弃的。
5.---XXX喜欢熬夜。
他总是白天感到困倦。
现在他又睡着了。
这不是一个好惯。
6.我们非常有把握在任何贸易战中获胜。
XXX well14.---What was that noise all morning?Oh。
the Wang family upstairs was decorating their living room.15.---The students and the teacher were waiting for me when I arrived at the school gate.What a pity!16.It doesn't need to be true。
2020安徽中考英语精准刷题练：易错易混题
易错易混题Ⅰ.单项填空1．—You are a beautiful girl.—．A．No. I am not beautifulB．Thank youC．Not at allD．I'm not so beautiful as you2．I will ring you up when I Wuhan tomorrow.A．will reach B．reached C．reaches D．reach 3．—There used to be lots of fish in the lake.—Yes. But there are very now.A．few B．fewer C．little D．less 4．—Shanghai is the biggest city in China.—Yes. It is bigger than in Jiangsu.A．any city B．all other cities C．any other city D．other cities 5．—Do you like Sichuan food?—Yes. My brothers and I like hot food very much.A．all B．both C．either D．neither 6．There are a lot people today than yesterday.A．of B．most C．/ D．more 7．—have you been to Xi'an?—Twice.A．How soon B．How many times C．How often D．How long 8．—Peter, is there anything else you want to know about China?—Yes, I am still wondering ．A．how does Yangzhou food tasteB．how many gardens are there in YangzhouC．what does the Slender West Lake look likeD．who is the first person to invent Yangzhou paper cut9．—you some more food?—Thank you. I enough.A．Will; have; have hadB．Will; have; hadC．Do; have; haveD．Do; have; had10．It's so cold outside. Remember to close the door you.A．beside B．before C．with D．behind11．She was angry at all I was doing she walked out without saying anything.A．so; /; that B．such; /; thatC．so; what; that D．such; what; that12．—Has your daughter come back form Australia?—Yes. She there for three years.A．has stayed B．stays C．stayed D．had stayed 13．—What is on show in the museum?—Some photos by American children.A．are taken B．were taken C．taken D．have been taken 14．I've got seven storybooks written by Zheng Yuanjie. You can borrowif you like.A．it B．one C．every D．ones 15．Mr. Brown has written some short stories, but he is known for his plays.A．much more B．the mostC．better D．goodⅡ.完形填空AI was born with a kind of illness—my arms are shorter. In people's 16 I ama disabled(残疾的) person, but I don't think so. I 17 think that I am different from others.With the help of my parents, friends and a special program for young people with disabilities(残疾), I have 18 how to fight for myself, and how to be strong. But that doesn't 19 that it has been easy for me to do many things well like others. I had to leave my baseball club 20 it was hard for me to catch the ball.When I was in elementary school, the other kids would help me 21 books or do some other things that were hard for me. When I was in the seventh grade, I leftmy elementary school, so I had to 22 new friends. Would I be able to find people who could see me as me but not as someone with a disability? Every day I would sit 23 and think about it. Later I had a group of eight good friends and we were 24 together. In senior high school, as lessons 25 harder, I had to work harder. I needed more time for my study. But I never had to take “special” classes.16．A.mouth B．eyes C．world D．nature17．A.sometimes B．often C．usually D．never18．A.tried B．learned C．forgotten D．asked19．A.hope B．mention C．feel D．mean20．A.but B．so C．though D．because 21．A.close B．pick up C．read D．stand up 22．A.work on B．know C．get along D．make23．A.asleep B．alive C．awake D．alone24．A.happy B．bored C．upset D．surprised 25．A.studied B．dropped C．got D．copiedBI often spend my summer holidays just with my parents. It is quite boring. But last summer holiday was 26 . Some of my friends came to stay with my parents and me for a week at our summer house. It is in a small beach town called Portsea. They got there by train. It 27 them three hours.One morning my friends and I 28 to take my parents' boat for a ride. We rowed(划船) 29 half an hour and found a big cave(山洞). Susan said it couldbe dangerous to go into it. But Peter said it was okay. 30 we started rowing again and got in. Then the tide(潮) started. At first we thought we could fight it but we were 31 . We shouted for 32 but there was no one around. Susan and I began to cry. Louis told us not to worry because the tide would be out. Because Louis always seemed to know the answer to 33 ，we stopped crying.Luckily, Louis was right 34 . After some hours the tide went out. We rowed back home quickly. We didn't 35 my parents about this special trip. And we were so afraid that we would not have a boat ride again.26．A.terrible B．difficult C．popular D．different 27．A.took B．spent C．gave D．used28．A.waited B．dreamed C．decided D．thanked 29．A.in B．on C．to D．for30．A.Because B．So C．If D．Or31．te B．wrong C．sorry D．busy32．A.help B．luck C．fun D．time33．A.someone B．anyone C．nothing D．everything 34．A.yet B．still C．again D．too35．A.call B．show C．ask D．tellⅢ.阅读理解AHappy Children's Palace36．You can't go to Happy Children's Palace to learn some skills on .A．Monday B．WednesdayC．Thursday D．Sunday37．Tom is a student in No. 4 Middle School. If he wants to improve his English, he can learn it from .A．Prof. W. Lambert B．Prof. G. WhiteC．Prof. J. Brown D．Mr. Liu Xin38．If you'd like to learn to use the new software, you have to go to Happy Children's Palace .A．twice B．nine timesC．ten times D．sixteen times39．Happy Children's Palace is forty minutes' ride from Henry's home. After learning drawing on Friday evening, Henry can get home at about by bike.A．21：00 B．21：10C．21：30 D．21：40BGarbage sorting is a big issue worldwide. In recent years, some Chinese cities have been working hard on it.Shanghai has worked with Alipay to create “a green account(账户)” service for its residents(居民). Account holders get points by correctly sorting their garbage. Through the Alipay app, they can exchange the points for milk, phone cards and other products. The city is asking all of its residents to sort their garbage into four groups: wet, recyclable(可回收的), harmful and dry.Xiamen has been sorting its garbage into the similar four groups since 2016. All the residents receive waste-sorting guidebooks. At first, people even could get some prizes like a small bag of rice if they sorted the garbage properly.China is improving its waste-sorting work. There is still a long way to go. But it's never too late to learn how to sort your trash properly and protect the environment.If you sort your garbage, you're helping to save energy and protect our environment.Four types of garbageRecyclable: Things that can be reused, including paper, metal, glass and old clothes.Wet: It is also called “household waste(厨余垃圾厂)”. “They are things you don't want but that pigs can eat，” Guangzhou Daily explained.Dry: Any waste that's not wet, recyclable or harmful.Harmful: This type of waste includes medicine, batteries and fluorescent bulbs(荧光灯泡)．If you throw them away, they may pollute the soil and water.40．The underlined word “exchange” means “”．A．改变B．交换C．购买D．置换41．When your pen is broken, its metal parts should be put it into .42．Which of the following is TRUE according to this passage?A．People in Xiamen could get points through the Alipay by correctly sorting their garbage.B．China still needs more time to improve waste-sorting work.C．All the trash can be sorted into one bin.D．There is no need to sort the garbage in the city.43．We can read this passage in .A．a storybook B．a novelC．a newspaper D．a magazineC“Early to bed and early to rise make a man healthy, wealthy and wise.” This is an old English saying. It means that when we go to bed early, we can get up early the next morning. Then we will become healthy. We will also become rich and clever.This is true. To be healthy, we must have enough sleep. Experts(专家) say that adults should get seven to eight hours of sleep a night. Teenagers need nine to ten hours. And school-aged children may need more than ten hours of sleep. Children who do not have enough sleep can't do their work very well. They won't be wise and they may not become wealthy!We also need exercise. Walking, running, swimming and playing games are all exercise. Exercise keeps us strong. It also helps the blood to move around the body.This is very important. Our blood takes the nutrition(营养) from food to all parts of our body.The head also needs blood. So exercise that moves the blood to our head helps us think better!44．If we get up early and go to bed early, we'll .A．become weakB．have more timeC．be healthyD．have more work to do45．Who needs most hours of sleep to keep healthy?A．Adults.B．Teenagers.C．Experts.D．School-aged children.46．A child when he does not have enough sleep.A．can't study wellB．will be wiseC．will be wealthyD．will be active in class47．A person needs exercise because ．A．he is strong enoughB．it helps make him healthyC．he has a lot of homework to doD．it can bring him much bloodDPeople often say, “Children can't do math problems, it's because parent s can't do their children's homework.” Here's an example to show what I mean.Living in a foreign culture can be exciting, but it can also be confusing(令人迷惑的). A group of Americans who taught English in other countries recently discussed their experiences. They decided that miscommunications were always possible, even over something as simple as“yes” and “no”．On her first day in Micronesia, an island in the Pacific, Lisa thought people weren't paying any attention to her. The day was hot. She went into a store and asked, “Do you have cold drinks？” The woman there didn't say anything. Lisa repeated the question. Still the woman said nothing. She later learned that the woman had answered her: She had raised her eyebrows(眉毛), which in Micronesia means “yes”．Jan remembered an experience she had in Bulgaria, a country in Europe. She went to a restaurant that was known for its cabbage. She asked the waiter, “Do you have cabbage today？” He nodded his head. Jan waited, but the cabbage never came. In that country, a nod means “no”．Tom had a similar problem when he arrived in India. After explaining something in class, he asked his students if they understood. They answered with many different nods and shakes of the head. He thought some people had not understood, so heexplained again. When he asked again, they did the same thing. He soon found out that his students did understand. In India, people nod and shake their heads in different ways depending on where they come from. You have to know where a person is from t o understand whether they mean “yes” or “no”．48．These Americans teaching English in other countries found that they ．A．should go abroad for vacationsB．needed to learn foreign languagesC．should often discuss their experiencesD．had problems with communications49．People in Micronesia show “yes” by .A．raising eyebrows B．shaking headsC．nodding heads D．saying “no”50．Tom misunderstood his class at first because .A．he didn't know where the students came fromB．he didn't explain everything clearly enoughC．he did not know much about Indian cultureD．some students didn't understand his questions51．Which of the following is TRUE according to this passage?A．Lisa was trying to buy some cabbage.B．In Bulgaria, nodding heads mea ns “no”．C．Jan taught English on a Pacific island.D．In India, only shaking heads means “YES”．52．The passage is mainly about .A．body language in foreign restaurantsB．the excitement of living in foreign countriesC．miscommunication in different culturesD．English teaching in other countries阅读下面短文，并用英语回答问题(请注意每小题后面的词数要求)。
【英语】 中考英语完形填空易错题经典1
【英语】中考英语完形填空易错题经典1一、中考英语完形填空（含答案详细解析）1．完形填空I will never forget the Sunday afternoons I spent at my grandfather's farm in western Pennsylvania when I was a little boy. Miles of winding stone walls around the house provided endless hours of 1 for a city kid like me.I can still remember one afternoon when I was eight years old. Since my first visit to the2 , I'd wanted to be allowed to climb the stone walls around the farm. My parents would never approve（赞同）. Still, my wish to climb across those walls grew so3 . One spring afternoon, I picked up all my courage and4 the living room, where the adults were sitting and talking over tea after dinner."Can I climb the stone walls?" I asked. Immediately the women in the room cried. "Heavens, no! You'll 5 yourself!" I wasn't too disappointed; their reply was just as I'd expected. But before I could leave the room, my 6 stopped me. "Wait a minute." I heard him say, "Let the boy climb the stone walls. He has to 7 to do things for himself.""Hurry up," he said to me, "and come and see me when you get back". For the next two and a half hours I climbed those old walls and had the 8 of my life. Later I met with my grandfather to tell him about my adventure（冒险）. I'll never forget what he said. "Fred," he said, smiling, "you made this day a 9 day just by being yourself. Always 10 , there's only one person in this whole world like you, and I like you exactly as you are."1. A. sadness B. pity C. fun D. puzzle2. A. farm B. house C. home D. room3. A. weak B. high C. low D. strong4. A. visited B. entered C. saw D. left5. A. enjoy B. hurt C. forget D. lose6. A. mother B. father C. grandfather D. friend7. A. agree B. finish C. promise D. learn8. A. time B. love C. regret D. failure9. A. terrible B. difficult C. special D. hopeless10. A. hope B. forget C. value D. remember【答案】（1）C；（2）A；（3）D；（4）B；（5）B；（6）C；（7）D；（8）A；（9）C；（10）D；【解析】【分析】【文章大意】本文主要讲述了是作者小时候在爷爷家的农场是如何度过一个难忘的周日下午。
中考数学易错题集锦及答案 [整理版]
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初中数学选择、填空、简答题易错题集锦及答案一、选择题1、A 、B 是数轴上原点两旁的点，则它们表示的两个有理数是（ ）A 、互为相反数B 、绝对值相等C 、是符号不同的数D 、都是负数 2、有理数a 、b 在数轴上的位置如图所示，则化简|a-b|-|a+b|的结果是（ ） A 、2a B 、2b C 、2a-2b D 、2a+b3、轮船顺流航行时m 千米/小时，逆流航行时(m-6)千米/小时，则水流速度（ ）A 、2千米/小时B 、3千米/小时C 、6千米/小时D 、不能确定 4、方程2x+3y=20的正整数解有（ ） A 、1个 B 、3个 C 、4个 D 、无数个 5、下列说法错误的是（ ）A 、两点确定一条直线B 、线段是直线的一部分C 、一条直线是一个平角D 、把线段向两边延长即是直线 6、函数y=(m 2-1)x 2-(3m-1)x+2的图象与x 轴的交点情况是 ( ) A 、当m ≠3时，有一个交点 B 、1±≠m 时，有两个交 C 、当1±=m 时，有一个交点 D 、不论m 为何值，均无交点7、如果两圆的半径分别为R 和r （R>r ），圆心距为d ，且(d-r)2=R 2，则两圆的位置关系是（ ） A 、内切 B 、外切 C 、内切或外切 D 、不能确定8、在数轴上表示有理数a 、b 、c 的小点分别是A 、B 、C 且b<a<c ，则下列图形正确的是（ ）A B C D 9、有理数中，绝对值最小的数是（ ） A 、-1 B 、1 C 、0 D 、不存在10、21的倒数的相反数是（ ）A 、-2B 、2C 、-21D 、2111、若|x|=x ，则-x 一定是（ ）A 、正数B 、非负数C 、负数D 、非正数12、两个有理数的和除以这两个有理数的积，其商为0，则这两个有理数为（ ） A 、互为相反数 B 、互为倒数 C 、互为相反数且不为0 D 、有一个为013、长方形的周长为x ，宽为2，则这个长方形的面积为（ ） A 、2x B 、2(x-2) C 、x-4 D 、2·(x-2)/2 14、“比x 的相反数大3的数”可表示为（ ） A 、-x-3 B 、-(x+3) C 、3-xD 、x+315、如果0<a<1，那么下列说法正确的是（ ） A 、a 2比a 大B 、a 2比a 小C 、a 2与a 相等D 、a 2与a 的大小不能确定16、数轴上，A 点表示-1，现在A 开始移动，先向左移动3个单位，再向右移动9个单位，又向左移动5个单位，这时，A 点表示的数是（ ）A 、-1B 、0C 、1D 、817、线段AB=4cm ，延长AB 到C ，使BC=AB 再延长BA 到D ，使AD=AB ，则线段CD 的长为（ ）A 、12cmB 、10cmC 、8cmD 、4cm18、21-的相反数是（ ）A 、21+B 、12-C 、21--D 、12+-19、方程x(x-1)(x-2)=x 的根是（ ）A 、x 1=1, x 2=2B 、x 1=0, x 2=1, x 3=2C 、x 1=253+, x 2=253- D 、x 1=0，x 2=353+, x 3=253- 20、解方程04)1(5)1(322=-+++xx x x 时，若设y x x =+1，则原方程可化为（ ）A 、3y 2+5y-4=0 B 、3y 2+5y-10=0 C 、3y 2+5y-2=0 D 、3y 2+5y+2=0 21、方程x 2+1=2|x|有（ ）A 、两个相等的实数根；B 、两个不相等的实数根；C 、三个不相等的实数根；D 、没有实数根 22、一次函数y=2(x-4)在y 轴上的截距为（ ）A 、-4B 、4C 、-8D 、823、解关于x 的不等式⎩⎨⎧-<>ax ax ，正确的结论是（ ）A 、无解B 、解为全体实数C 、当a>0时无解D 、当a<0时无解 24、反比例函数xy 2=，当x ≤3时，y 的取值范围是（ ） A 、y ≤32 B 、y ≥32C 、y ≥32或y<0D 、0<y ≤3225、0.4的算术平方根是（ ） A 、0.2 B 、±0.2 C 、510D 、±510 26、李明骑车上学，一开始以某一速度行驶，途中车子发生故障，只好停车修理，车修好后，因怕耽误时间，于时就加快了车速，在下列给出的四个函数示意图象，符合以上情况的是（ ） A B C D27、若一数组x 1, x 2, x 3, …, x n 的平均数为x ，方差为s 2，则另一数组kx 1, kx 2, kx 3, …, kx n 的平均数与方差分别是（ ） A 、k x , k 2s2B 、x , s2C 、k x , ks2D 、k 2x , ks 228、若关于x 的方程21=+-ax x 有解，则a 的取值范围是（ ）A 、a ≠1B 、a ≠-1C 、a ≠2D 、a ≠±129、下列图形中既是中心对称图形，又是轴对称图形的是（ ）A 、线段B 、正三角形C 、平行四边形D 、等腰梯形 30、已知dcb a =，下列各式中不成立的是（ ）A 、d c b a d c b a ++=-- B 、d b c a d c 33++= C 、bd ac b a 23++= D 、ad=bc 31、一个三角形的三个内角不相等，则它的最小角不大于（ ） A 、30B 、45C 、550D 、60032、已知三角形内的一个点到它的三边距离相等，那么这个点是（ ）A 、三角形的外心B 、三角形的重心C 、三角形的内心D 、三角形的垂心33、下列三角形中是直角三角形的个数有（ ）①三边长分别为3:1:2的三角形 ②三边长之比为1:2:3的三角形 ③三个内角的度数之比为3:4:5的三角形 ④一边上的中线等于该边一半的三角形 A 、1个 B 、2个 C 、3个 D 、4个34、如图，设AB=1，S △OAB =43cm 2，则弧AB 长为（ ）A 、3πcm B 、32πcm C 、6πcm D 、2πcm 35、平行四边形的一边长为5cm ，则它的两条对角线长可以是（ ） A 、4cm, 6cm B 、4cm, 3cm C 、2cm, 12cm D 、4cm, 8cm 36、如图，△ABC 与△BDE 都是正三角形，且AB<BD ，若△ABC 不动，将△BDE 绕B 点旋转，则在旋转过程中，AE 与CD 的大小关系是（ ） A 、AE=CD B 、AE>CD C 、AE>CD D 、无法确定37、顺次连结四边形各边中点得到一个菱形，则原四边形必是（ ） A 、矩形 B 、梯形 C 、两条对角线互相垂直的四边形 D 、两条对角线相等的四边形38、在圆O 中，弧AB=2CD ，那么弦AB 和弦CD 的关系是（ ）A 、AB=2CDB 、AB>2CDC 、AB<2CD D 、AB 与CD 不可能相等 39、在等边三角形ABC 外有一点D ，满足AD=AC ，则∠BDC 的度数为（ ）A 、30B 、60C 、150D 、300或150040、△ABC 的三边a 、b 、c 满足a ≤b ≤c ，△ABC 的周长为18，则（ ）A 、a ≤6B 、b<6C 、c>6D 、a 、b 、c 中有一个等于641、如图，在△ABC 中，∠ACB=Rt ∠，AC=1，BC=2，则下列说法正确的是（ ）A 、∠B=30B 、斜边上的中线长为1C 、斜边上的高线长为552 D 、该三角形外接圆的半径为142、如图，把直角三角形纸片沿过顶点B 的直线BE （BE 交CA 于E ）折叠，直角顶点C 落在斜边AB 上，如果折叠后得到等腰三角形EBA ，那么下列结论中（1）∠A=300（2）点C 与AB 的中点重合 （3）点E 到AB 的距离等于CE 的长，正确的个数是（ ） A 、0 B 、1 C 、2 D 、3 43、不等式6322+>+x x 的解是（ ）A 、x>2B 、x>-2C 、x<2D 、x<-244、已知一元二次方程(m-1)x 2-4mx+4m-2=0有实数根，则m 的取值范围是（ ）A 、m ≤1B 、m ≥31且m ≠1C 、m ≥1D 、-1<m ≤1 45、函数y=kx+b(b>0)和y=xk-(k ≠0)，在同一坐标系中的图象可能是（ ）ABA B C D46、在一次函数y=2x-1的图象上，到两坐标轴距离相等的点有（ ）A 、1个B 、2个C 、3个D 、无数个47、若点（-2，y 1）、（-1，y 2）、（1，y 3）在反比例函数xy 1=的图像上， 则下列结论中正确的是（ ）A 、y 1>y 2>y 3B 、y 1<y 2<y 3C 、y 2>y 1>y 3D 、y 3>y 1>y 2 48、下列根式是最简二次根式的是（ ） A 、a 8 B 、22b a + C 、x 1.0 D 、5a49、下列计算哪个是正确的（ ）A 、523=+B 、5252=+C 、b a b a +=+22D 、212221221+=-50、把aa 1--（a 不限定为正数）化简，结果为（ ） A 、a B 、a - C 、-a D 、-a -51、若a+|a|=0，则22)2(a a +-等于（ ） A 、2-2a B 、2a-2 C 、-2 D 、252、已知02112=-+-x x ，则122+-x x 的值（ ）A 、1B 、±21 C 、21 D 、-2153、设a 、b 是方程x 2-12x+9=0的两个根，则b a +等于（ ）A 、18B 、6C 、23D 、±23 54、下列命题中，正确的个数是（ B ）①等边三角形都相似 ②直角三角形都相似 ③等腰三角形都相似④锐角三角形都相似 ⑤等腰三角形都全等 ⑥有一个角相等的等腰三角形相似⑦有一个钝角相等的两个等腰三角形相似 ⑧全等三角形相似 A 、2个 B 、3个 C 、4个 D 、5个 二、填空题1、如果一个数的绝对值等于它的相反数，那么这个数一定是_________。
中考英语选择填空题易错题汇编及解析
中考英语选择填空题易错题汇编及解析（一）名词冠词：1.—What can I do for you？—I’d like two _______.A. box of appleB. boxes of applesC. box of applesD. boxes of apple2.Help yourself to _________.A. some chickensB. a chickenC. some chickenD. any chicken3……________ it is today！A. What fine weatherB. What a fine weatherC. How a fine weatherD. How fine a weather4.Which is the way to the __________？A. shoe factoryB. shoes factoryC. shoe’s factoryD. shoes’factory5.This class ________ now. Miss Gao teaches them.A. are studyingB. is studyingC. be studyingD. studying6.We will have a _________ holiday after the exam.A. two monthB. two-monthC. two month’sD. two-months7.________ trees are cut down in the forests every year.A. ThousandB. ThousandsC. Thousand ofD. Thousands of8.Our sports meeting will be held ________.A. on 24，Tuesday，AprilB. in April 24，TuesdayC. on Tuesday，April 24D. in April Tuesday 249_________ people here are very friendly to us.A. TheB. /C. AD. An10……There is no enough ________ in the corner to put the table.A. placeB. roomC. floorD. ground中考英语选择填空题易错题汇编及解析（二）代词11.Some people like to stay at home，but ________ like to go to the cinema.A. anotherB. otherC. othersD. other one12.——Is this your shoe？——Yes，but where is _________？A. the other oneB. other oneC. another oneD. the others13.—When shall we meet again next week？—_______ day is possible. It’s no problem with me.A. EitherB. NeitherC. EveryD. Any14.Have you ever seen ________ big panda before？A. a suchB. such aC. so aD. a so15.—_______ do you write to your parents？—Once a month.A. How longB. How soonC. How oftenD. How far16.Robert has gone to _________ city and he’ll be back in a week.A. otherB. the otherC. anotherD. any other17.—A latest magazine，please.—Only one left. Would you like to have ________？A. itB. oneC. thisD. that18.—Which book would you like to borrow？—____ of the two books is OK with me.A. EitherB. BothC. AnyD. None19.He knows _________ English ________ French. But he’s very good at Japanese.A. either；orB. both；andC. neither；norD. either；nor20.—What do your parents do？—One is a teacher；_________ is a driver.A. otherB. anotherC. the otherD. that one21.Mrs. Lee teaches ________ math. We all like her.A. weB. usC. ourD. ours22.There are many trees on ________ side of the street.A. eitherB. anyC. allD. both23.________ is the population of the city？A. How manyB. WhatC. How many peopleD. How much中考英语选择填空题易错题汇编及解析（三）介词、连词24.Japan is ________ the east of China. A. in B. to C. on D. at25.The postman shouted，“Mr Green，here is a letter ________ you.”A. toB. fromC. forD. of26.We can’t do it ________ your help.A. withB. ofC. underD. without27.He hasn’t heard from his friend __________ last month.A. sinceB. by the end ofC. forD. until28.I didn’t buy the dictionary yesterday _________ my aunt would give me one.A. untilB. becauseC. ifD. before29.I’m going to look for another job ________ the company offers me more money.A. afterB. unlessC. whenD. for30.Don’t hurry. The bus won’t start ________ everybody gets on.A. sinceB. asC. untilD. when31.Please show me ____ to send an e-mail，John. It’s the first time for me to do it.A. howB. whatC. whenD. where32.You’ve passed the exam. I’m happy ______ you.A. onB. atC. inD. for33.I wonder ________ they finished so many different jobs in such a short time.A. whyB. howC. whenD. where34.——Do you speak English？——Yes，I speak ____ a little English ____ some French.A. neither，notB. both，orC. either，orD. not only，but also35.______ the maths problem is difficult，I’ll try very hard to work it out.A. ThoughB. WhenC. BeforeD. After36.The accident took place ________ a cold February evening.A. onB. inC. atD. for37.He turned ________ the radio because his father was asleep.A. onB. downC. upD. over38.I don’t know the homework _______ today.A. onB. inC. ofD. for39.—Oh，it’s raining heavily. —Please don’t leave ________ it stops.A. whenB. afterC. sinceD. until40.Jane said she would come here ________ 9：00 and 9：30 tomorrow morning.A. fromB. atC. betweenD. around动词41.My father went to Shanghai yesterday. He ______ back in two weeks.A. comesB. has comeC. will comeD. came42.It’s spring now. The students ________ trees these weeks.A. plantB. are plantingC. will plantD. planted43—______ you _____ your book to the library？—Yes. I returned it yesterday.A. Did，returnB. Have，returnedC. Will，returnD. Do，return44.—Must I finish it now？—No，you ________.A. mustn’tB. needn’tC. can’tD. shouldn’t45.Though it’s cloudy now，it _________ get sunny later.A. canB. mayC. mustD. need46.It is in the library，you _______ talk loudly.A. may notB. can’tC. needn’tD. mustn’t47.If anyone wants to say something in class，you ________ put up your hands first.A. mustB. mayC. shouldD. can48.—I called you last night but no one answered the phone.—I ________ dinner with my friends in the restaurant.A. haveB. hadC. was havingD. have had49.If you have lost a library book，you have to _________ it.A. find outB. look afterC. pay forD. take care50.He will call me as soon as he _________ the city.A. reachesB. reachedC. will reachD. is reaching51.The pen _________ him ten yuan. A. paid B. cost C. took D. spent52.The train _________ for twenty minutes.A. leftB. has leftC. is leavingD. has been away53.—How many books __ they ___？—Five. But they haven’t finished reading even one.A. did…borrowB. had…borrowedC. will…borrowD. do…borrow54.He _________ his bike so he has to walk there.A. lostB. has lostC. had lostD. loses55.—Why did the policeman stop us？—He told us not _______ so fast in this street.A. driveB. drivingC. to driveD. drove形容词、副词56.The population of the world in 20th century became very much _________ than that in 19th.A. biggerB. largerC. greaterD. more57.Miss Li is one of _______ in our school.A. a popular teacherB. more popular teacherC. most popular teacherD. the most popular teachers58.The magazines are ________ easy that the children can read them well.A. suchB. soC. tooD. very59.—Would you like ________ more tea？—Thank you. I’ve had ________.A. any，muchB. some，enoughC. some，muchD. any，enough60.I think basketball is _______. I like to watch it.A. boringB. boredC. excitingD. excited61.This dinner looks _______ to me，and I like it.A. terribleB. goodC. badlyD. nicely62.The math problem is so hard that ________ students can work it out.A. a fewB. a littleC. manyD. few63.—What’s the weather like tomorrow？—The radio says it is going to be even ______.A. badB. worstC. badlyD. worse64.Though she talks ______，she has made ________ friends here.A. a little，a fewB. little，fewC. little，a fewD. few，a few65.He never does his work _______ Mary.A. as careful asB. so careful asC. as carefully asD. carefully as句法66.If it ________ tomorrow we’ll go to the park.A. will not rainB. doesn’t rainC. is not rainingD. didn’t rain67.The radio says the snow ______ late in the day.A. stopsB. will stopC. has stoppedD. stopped68.The nurse told the children the sun ______ in the east.A. risesB. roseC. will riseD. has risen69.—Are you sure you have to？It’s been very late.—I don’t know ______ I can do it if not now.A. whereB. whyC. whenD. how70.—Could you tell me _______ she is looking for？—Her cousin，Susan.A. thatB. whoseC. whomD. which71.—When are the Shutes leaving for New York？—Pardon？—I asked ___________.A.when are the Shutes leaving for New YorkB.when the Shutes are leaving for New YorkC.when were the Shutes leaving for New YorkD.when the Shutes were leaving for New York72.Would you please tell me ________ next，Mr Wang？A. what should we doB. we should do whatC. what we should doD. should do what73.Mr. King didn’t know _______ yesterday evening.A. when does his son come backB. when his son comes backC. when did his son come homeD. when his son came home74.Alice has gone to the classroom and she didn’t say ________.A. when did she come backB. when would she be backC. when she came backD. when she would be back75.—I’m sorry I broke your coffee cup. —Oh，really？_________.A. It doesn’t matterB. I don’t knowC. it’s OK with meD. You’re welcome76.—Would you mind calling me back tomorrow again？—_________.A. Not at allB. You’re welcomeC. You’re rightD. Nice to meet you77.He hardly had anything to eat，________ he？A. didn’tB. hadn’tC. hadD. did。
人教版中考易错题100题(适合于九年级总复习,中考易错题)
人教版九年级下册易错题综合复习一（C ）1.Yesterday Mr.Green went to his hometown and visited the old house ____ he was born in.A.whatB.howC.whichD.that（B ）2.There are 50 students in Class One. Twenty of them are boys, __ are girls.A.someB.the othersC.the otherD.others（A）3.She often parks her car near the house __ she can get to.A.whichB.whereC.thatD.what（B）4.Is this toy __ you played with last time ?A.thatB.the oneC.whichD.what（ACE）(不定项）5.Is this the toy ___ you played with last time ?A.thatB.the oneC.whichD.whatE./（AD ）(不定项）6.Is this the factory __ you worked ?A.in whichB.whichC.thatD.where（B ）7.-How can I pay full attention to my homework ?-Turn off your phone and B__ any possible bother.A.keeping offB.keep offC.to keep offD.kept off（C）8.-_C_ your homework faster, Danny. Then you can have more time to have fun.A.DoesB.DoingC.DoD.To do（B ）9.I've never seen a movie __ than it.A.the most excitingB.more excitingC.a more excitingD.much exciting（A ）10.It's ___ movie I've ever seen.A.the most excitingB.more excitingC.a more excitingD.much exciting（C）11.-May I help you with some jeans, sir ?-Yes, I'd like to try on those blue ___.A.pair C.ones C.one（A ）12.- Is the river_____ through that town very large?A which flowsB flowsC that flowingD whose flows（C ）13.The pen ___she writes letters is broken.A whichB thatC with whichD by which（D ）14.He is one of the students who, I am sure, always do ____ best.A hisB one’sC myD their（A）15.The teacher gave me a piece of paper__A___.A to write onB to be written onC to write inD to be written（C ）16.This is a film _C__ Spielberg used real actors instend of stunt men.A.whichB.whoseC.in whichD.of which（A）17.-How often do you write emails to your sister ?-Only once a month. A_ of us has enough time.A.NeitherB.EitherC.NoneD.All（D ）18.People's way of life in the north is quite different from _D_ in the south.A.itB.thoseC.thisD.that1.The house is _C_ than that one.A.two-thirds largeB.two third largerC.two-thirds largerrger two-thirds（B ）19.-Alice, are you going to Bob's birthday party on Saturday ?-Unless I __.A.will be invitedB.am invitedC.was invitingD.invited（D）20.-Close your eyes and guess what the box is made of.-It's so light. It must be made of__.A.ironB.metalC.silverD.plastic（C）21.-There is so much rubbish in the river.-Yes. Luckily, to save water, many things __.A.are doingB.are going to doC.are going to be doneD.are going to be doing（C ）22.We should spend as much time as we can __ our lessons after class.A.to reviewB.reviewC.reviewing（A）23.We should do as much as we can __ our lessons after class.A.to reviewB.reviewC.reviewing（D）24.our school football team won the cup !-Well, it __ be true. We are far from the best team.A.mustn'tB.needn'tC.shouldn'tD.can't（B）25.-Madame Curie is one of the scientists __ won two Nobel Prizes.-She will be remembered by people for __ she discovered.A.that;thatB.who; whatC.who;thatD.which; what（D）26.__ is a pity that you can't go to the concert with me tonight.A.ThatB.WhatC.ThisD.It( C ) 27. — The cakes ____ delicious. I’d like to have one.— OK. Here you are.A. soundB. feelC. lookD. taste( A )28. — How much ____ the pair of gloves?— Twenty dollars ____ enough.A. is; isB. are; isC. is; areD. are; are( C )29.Lucy remembered __ the kitchen before leaving home. But as she entered it after work, she saw it was a mess.A.cleanB.have cleanedC.cleaningD.cleaned( B )30. — Are you busy working on the project, Tim?— Yes. If I finish the ____ earlier, we can go to a movie together.A. surveyB. taskC. goalD. process( A )31. — Do you remember attending Julia’s birthday party, John?— Yes. ____A. It was a really great time for me.B. I’m really looking forward to seeing her.C. Why not prepare a good present for her?D. She must be waiting for us to arrive there soon.( B/D )32.Our school organized a job fair and a computer company ____ my attention.A. matchedB. drewC. influencedD. caught（C ）33.-Could I ask your neighbors for help, Tom ?-I'm afraid not. I __ know them.A.onlyB.seldomC.hardlyD.just（C ）34.-My parents __ allow me to go swimming in the river without them.-I think so. That's too dangerous.A.shouldn'tB.mustn'tC.wouldn'tD.needn't（C ）35.-Like so many creative people he is never __.-That's why he's made lots of valuable paintings.A.cheerfulB.skillfulC.satisfiedD.surprised（B ）36.Why can ___ movies help improve our English ?A.to watchB.watchingC.watchedD.watch（A ）37.My little sister fell in love with the movie __ Dumbo ___.A.called;as wellB.call; as well asC.called; eitherD.calling; too（C）38.They find __ difficult to understand what native English speakers say.A.thisB.himC.itD.that（A ）39.Read something you are interested in, ___ that you have to read.A.orB.andC.but（B ）40.Your dream will not come true __ you keep trying your best.A.whenB.unlessC.whetherD.because（C ）41.Mr.Zhang, I have trouble ___ the text. Could you help me?-Certainly. First, remember __ it three times at least.A.to understand; readingB.understanding; readingC.understanding; to readD.to understand; to read（B ）42.There are so many beautiful T-shirts. I really don’t know __.-Let’s ask the assistant for help.A.what I choose itB.which one to chooseC.how to chooseD.where I choose（B ）43.I made a decision to go to Yunnan Province ___.A.on myselfB.on my ownC.in myselfD.in my own（B ）44.-Can you give us some advice __ prevent the terrorist attack ? -Sorry. A.on how B.on how to C.to what D.to what to（D）45.I try to pay attention ___ fewer mistakes.A.makeB.makingC.to makeD.to making（A ）46.People __ cross the road when the traffic lights are red.A.mustn’tB.needn’tC.mustD.need（B ）47.David finds__ difficult to communicate with his parents.A.oneB.itC.thisD.that（D ）48. Erquan Yingyue is one of __ pieces of folk music in China.A.more famousB.most famousC.famousD.the most famous（D ）49.Everyone ___ down from 10:10.9.8...esB.turnsC.looksD.counts（A ）50.___ exciting the news is ! Beijing will hold 2022 Winter Olympic Games.A.HowB.What aC.WhatD.What an（A ）51.-I wonder ___. -I’m not sure yet.A.which is hersB.which hers isC.whether is it hersD.whether hers it is（A ）52.How she __ that she could have __ in the new year !A.wished; good luckB.wish; good luckyC.hoped; good luckD.hope; a good luck（B ）53.-___ your coat, it’s cold today.-Look at me. I’m ___ a coat.A.Wear; putting onB.Put on; wearingC.Dress; wearingD.Dresses; putting on（D）54.Please remind me __ Linda at 9:00 p.m.A.callB.calledC.callingD.to call（B ）55.___ fun ___ a trick on someone on April 1st.A.It’s; playingB.It’s; to playC.That; playingD.That’s; to play（C ）56.-Have you watched the movie named Amazing China ?-Sure, I have. __ great achievements our country has made !A.What aB.What anC.WhatD.How（D）57.-Do you know if Jim __ to the party ?-I am not sure. But if he___, I will give him a big surprise.es; will comeB.will come; will comees; comesD.will come; comes（D）58.-What did Tom say to you just now, John ? -He asked __.A.why I am so happy todayB.who did I play football with after schoolB.what will I do for the weekend D.if I could go to the movies with him tonight（D ）59.-Our school will organize a spring outing next week.-___ wonderful news ! It’ll be a good time to relax ourselves.A.HowB.What aC.How aD.What（B）60.-What’s wrong with Lisa?-She didn’t do well in the exam. She worries about ___ she can pass it.A.thatB.whetherC.whatD.if（B ）61.-With __ did you go to Beijing ?-My mother. We went to see my father.A.whichB.whomC.whoD.whose（B ）62.-Could you please tell me ___ ?-No problem. It’s on Huayuan Road, a wonderful amusement park.A.where’s there a place to have funB.where there’s a place to have funC.where is a place to have funD.where a place is to have fun（A ）63.We can get a lot of famous English movies ___ the Internet.A.onB.withC.byD.about（C）64.-All the money in Mary’s wallet was stolen, but her ID card ____. --But she remained __ as if nothing had happened.A.remained; happilyB.was remained; happilyC.remained;happyD.was remained; happy（A ）65.I also learned that not all great ideas _____.A.workB.faileD.send（D ）66.-Changchun has been building its subways since 2012.-Yes. It’ll be more convenient for people to go out after they’re all _____. A.processed B.created C.protected pleted（C ）67.-Can I go out to play football, Mom ?-Look, your bedroom is in a mess. You can’t go out until it ____.A.cleansB.has cleanedC.is cleanedD.will be cleaned（A ）68.-Hi, Pam ! __ this pair of gloves yours ?-No, but the scissors on the desk _____ mine.A.Is;areB.Is;isC.Are;isD.Are;are（A ）69.-Have you ever been to ___, Sally ?-Yes, I traveled there last year. And I made friends with lots of __ there.A.Germany;GermansB.German; GermanyC.Germany; GermenD.Germans; Germany（C ）70.-Can I go out to play football, Mom ?-Look, your bedroom is a mess. You can’t go out until it ____.A.cleansB.has cleanedC.is cleanedD.will be cleaned（D）71.A new kind of bikes ___ out already.A.have soldB.has soldC.has been soldD.have been sold（A ）72.He was made ___ from morning till night.A.to workB.workC.workingD.worked（C ）73.This book ____ everybody.A.is known byB.is known forC.is known toD.knows（C ）74.-I find it hard to improve my spoken English soon.-Be patient, please. It needs a long __.A.introductionB.experienceC.processD.development（C ）75. -You seldom have desserts, __.-___. It’s bad for my teeth, I think.A.do you; Yes, I doB.don’t you; Yes, I do.C.do you; No, I don’tD.don’t you; No, I don’t.（C）76.-People use smartphones ____.-Yes. They are very important in our __ life.A.everyday; everydayB.everyday; every dayC.every day; everydayD.every day; every day（B ）77.Don’t play computer games unless your homework _____.A.has doneB.is doneC.was doneD.will be done（A ）78.This kind of salad tasted ___ and it sells __.A.good;wellB.well;goodC.well;wellD.good;good（D ）79.His bad marks made him ____.A.happyB.to happyC.to be unhappyD.unhappy（B）80.-Hurry up, the bus is coming.-Wait a minute. Don’t cross the street ____ the traffic light is green.A.afterB.untilC.whileD.unless（D ）81.His speech __ a cheer among the students. They all __ from their chairs.A.rose; roseB.raised; raisedC.rose; raisedD.raised;rose（D ）82.Many students enjoyed the book Harry Potter _____by J.K. Rowling. A.wrote B.was written C.was writing D.written（A ）83. -Would your sister go to Hainan this summer?-If I don’t go, _______.A.neither will sheB. neither does sheC. so will sheD. so does she（C ）84.My brother and I will go hiking tomorrow.-_____.Shall we go together?A.So do IB. So I doC. So will ID. So I will（B ）85.The students are on their way home, ________ and ________ .A. laugh ; talkB. laughing ; talkingC. laughed ; talkingD. are laughing ;talking（B ）86. Tomorrow I’ll get my hair_______. It’s a little long.A. cutsB. cutC. to cutD. cutting（C ）87.You kept us_______ for a long time.A. waitB. to waitC. waitingD. waited（D ）88.The old man needs to spend time ________ his family.A. onB. toC. inD. with（B ）89.It would be better _____a mobile phone.A. haveB. to haveC. havingD. had（C ）90.—Susan, why are you still here? They are all ready to start.—I’m sorry, but I _____when to leave.A.don’t tellB.didn’t tellC. wasn’t toldD. is told（B ）91.__good advice you have given to me ! I'll take it.A.HowB.WhatC.HowD.What a（C ）92.The world is changing fast every day. I wonder __ in the future.A.what will the world look likeB.how we think of the worldC.whether the world will have peaceD.which country wins the match（A ）93.The show also __ the moving stories behind those people.A.tellsB.talksC.speaksD.says(C)94.—What_____to your city in recent years?-Lots of wide roads,tall buildings and beautifulparks have been built.A.takes placeB.have happenedC.has happenedD.happened (C)95. Jack,please don’t look out of the window.—_____.A.It’s right.B.I know that.C.Sorry,I don’t do it again.D.It doesn't matter.(A)96. —I have to be home by10:00p.m.—_____.A.So do IB.So have IC.So I doD.So I have(A)97.He made his sister_______at last.She began to laugh. A.stop crying B.to stop cryingC.stop to cryD.to stop to cry(C)98.Can you tell me______?A. where does he liveB. how did he come here yesterdayC. what his job isD.that he is good at English(A)puters_______in everyday life in this country before long.A.will be usedB.is usedC.will useD.was used(A/D)100.Every morning Mr.Smith takes a______to his office. A．20minutes’ walk B．20minute’s walkC．20-minutes walk D．20-minute walk。
中考总复习初中物理经典易错题100例
中考总复习初中物理经典易错题100例力和运动１．在湖中划船时，使船前进的的动力是（）A.桨划水的推力B.水直接对船的推力C.人对船的推力D.水对桨的推力2.踢到空中的足球,受到哪些力的作用( )A受到脚的作用力和重力 B受到重力的作用C只受到脚的作有力 D没有受到任何力的作用3.一辆汽车分别以6米/秒和4米/秒的速度运动时，它的惯性大小：（）A.一样大；B.速度为4米/秒时大；C.速度为6米/秒时大；D.无法比较4.站在匀速行驶的汽车里的乘客受到几个力的作用( )A.1个B.2 个C.3个D.4个5．甲、乙两个同学沿相反的方向拉测力计，各用力200牛.则测力计的示数为( ）A、100牛B、200牛C、0牛D、400牛6.一物体受到两个力的作用,这两个力三要素完全相同,那么这两个力( )A 一定是平衡力B 一定不是平衡力C 可能是平衡力D 无法判断7.体育课上，小明匀速爬杆小刚匀速爬绳。
有关他们受到的摩擦力下面说法正确的是（）A、因为爬杆时手握杆的压力大，所以小明受到的摩擦力一定大B、因为绳子粗糙，所以小刚受到的摩擦力一定大C、小明和小刚受到的摩擦力一定相等D、若小明的体重大，则他受到的摩擦力一定大8.如图所示，物体A在水平力F的作用下，静止在竖直墙壁上．当水平力减小为F／2时，物体A恰好沿竖直墙壁匀速下滑．此时物体A所受摩擦力的大小（）A．减小为原来的1／2 B．和原来一样 C．增大为原来的2倍D．无法判断9．蹦极游戏是将一根有弹性的绳子一端系在身上，另一端固定在高处，从高处跳下，a是弹性绳自然下垂的位置，C点是游戏者所到达的最低点，游戏者从离开跳台到最低点的过程中，物体速度是如何变化的?_______________ 10.A、B两物体叠放在水平桌面上，在如图所示的三种情况下：①甲图中两物体均处于静止状态；②乙图中水平恒力F作用在B物体上，使A、B一起以2m/s的速度做匀速直线运动；③丙图中水平恒力F作用在B物体上，使A、B一起以20m/s的速度做匀速直线运动。
中考数学选择填空高频易错题100道
∴∠BCD＝100°﹣90°＝10°，
1 共 59
综上，则∠BCD 的度数为 60°或 10°
3．如图，工人师傅用扳手拧形状为正六边形的螺帽，现测得扳手的开口宽度 b＝3cm，则螺帽边长 a＝ √3
cm．
【分析】根据正六边形的性质，可得∠ABC＝120°，AB＝BC＝a，根据等腰三角形的性质，可得 CD 的长，
根据锐角三角函数的余弦，可得答案．
【解析】如图，连接 AC，过点 B 作 BD⊥AC 于 D
由正六边形，得∠ABC＝120°，AB＝BC＝a，
∠BCD＝∠BAC＝30°．
由 AC＝3，得 CD＝1.5．
√3
cos∠BCD= = 2 ，
即
1.5
=
√3
，
2
解得 a= √3
2 共 59
4．如图，在矩形 ABCD 中，BD 是对角线，AE⊥BD，垂足为 E，连接 CE．若∠ADB＝30°，则 tan∠DEC
的性质得出∠B2B3B4＝108°，则∠B4B3D＝72°，由平行线的性质得出∠EDA3＝∠B4B3D＝72°，再由四
边形内角和即可得出答案．
8 共 59
【解析】设 l 交 A1A2 于 E、交 A4A3 于 D，如图所示：
∵六边形 A1A2A3A4A5A6 是正六边形，六边形的内角和＝（6﹣2）×180°＝720°，
2
2
【分析】由方程有两个不相等的实数根，则运用一元二次方程 ax +bx+c＝0（a≠0）的根的判别式是 b ﹣4ac
＞0 即可进行解答
2
【解析】由关于 x 的方程 ax +2x﹣3＝0 有两个不相等的实数根
中考易错单项填空题100例
中考易错单项填空题100题1.---Doyouknowwhathedidallday?---Hespentasmuchtimeplayingashe______.A.studyingB.wasstudyingC.studiedD.didstudying2.Ican’tsay______Iwanttoseehimagain.Wehaven’tseeneachotherforalongtime.A.howlongB.howsoonC.howoftenD.howmuch3.Itissaidthatlandanimals______fromseaanimals.A.weredevelopedB.developedC.aredevelopingD.develops4.---Wouldyoulikesomecoffee?---Yes,andpleasegetmesomemilk,too.Iprefercoffee______milk.A.toB.withC.thanD.of5.______madehisteacherunhappy.A.TomcamelateB.Tom’scamelateC.Tom’slateD.Tom’scominglate6.FatheraskedEdison________.A.whatwashedoingthatforB.whyhewasdoingthatforC.howhewasdoingthatforD.whathewasdoingthatfor7.Wearegoingtohavethesportsmeeting_____it_______tomorrow.A.if,rainsB.unless,willrainC.unless,rainsD.when,willrain8.______ofthestudentsinourclass_______fromthecountry.A.Threefifth,isB.Threefifths,areC.Thirdfives,areD.Threefive,is9.Newscan_____everycorneroftheworldwiththehelpoftheInternet.A.reachB.arriveC.getD.reachto10.Hereisonlyoneseatfortheoldman________.A.tositB.sittingC.sittingonD.tositon11.Thoughthispairofshoesisabitexpensive,Iwouldliketo________.A.trythemonB.tryonthemC.trythemoutD.tryoutthem12.Howcanwefinish____muchworkin___ashorttime?A.so,soB.such,suchC.so,suchD.such,sostnight,hehadhiscar________.A.tostealB.stoleC.stealingD.stolenstnightseveralyoungmen________thebankoflotsofmoney.A.stoleB.robbedC.tookD.got15.Wherewasthisbigegg_____?A.liedinidy16._______school,wecangetmuchknowledge.A.BecauseB.ThanksforC.ThankswithD.Thanksto17.You’dbetterthinkabout________acarnow.A.whetherbuyB.ifbuyC.whethertobuyD.iftobuy18.Hetalkstoomuchasifhe______everything.A.knowsB.knewC.hasknownD.toknow19.Hewillcometostaywithusfor_________________nextmonth.A.sometimesometimeB.sometimesometimeC.sometimeD.sometimes20.Thisradioprogramiswellworth________.A.listeningB.listeningtoC.watchingD.tolisten21.Hemustbeadoctor,_________?A.mustn’theB.mustheC.isheD.isn’the22.Thisbuildingistallerthan_________onearoundit.A.anyotherB.anotheroneC.anyD.someother23.Thoughhelive________,hedoesn’tfeel________becausehecanenjoyhimselfathome.A.lonely,lonelyB.alone,aloneC.alone,lonelyD.lonely,alone24.YangzhouHighSchoolsounds_________agoodone.ButIwouldliketohavemoreinformationaboutit.A./B.asC.likeD.what25.---Howlong_______you_______theEnglishdictionary?---Abouthalfayear.A.have,gotB.did,buyC.have,hadD.have,bought26._______mygreatsurprise,suchalittleboycandrawsomanybeautifulpictures.A.InB.WithC.ToD.For27._____theoldmanspoke,____hebecame.A.Themore,theangryB.Themore,themoreangrilyC.Themore,theangrierD.Themost,theangrier28.____thehelpofmyEnglishteacher,IdidwellinEnglishlastterm.A.UnderB.InC.WithD.For29.She_____ateacher,butnowsheisadoctor.edbeedtobeC.wasusedtobeD.was30.Whatdoyouthink__________himchangehismind?A.tomakeB.madeC.makeD.making31.Theyarepractising_______inthehall.A.danceB.todanceC.dancingD.todancing32.Itis_____thatweallliketoreadit.A.sogoodabook.B.suchgoodabookC.soagoodbookD.suchgoodbooks33.Sheoftenoffers_______.withsomefoodB.somefoodtoustosomefoodD.moneyme34.Mostsharksfeed_____fishandotheranimals.A.withB.forC.onD.by35.---CanyoulookaftermydaughterformewhileIamaway?---______.A.It’sapleasureB.WithpleasureC.NotatallD.You’rewelcome36.Canyouthinkofaway________it？A.doingB.doC.todoD.ofdo37.I’llgether_______harder.Youwaitandsee.A.studyB.tostudyC.studiedD.studies38.Hearinghismother’svoice,thechildcouldn’twait_______out.A.rushingB.torushC.rushedD.forrushing39.Theking_______himselffromaleaningtree.A.hungB.hangedC.hungedD.hang40.Jimgotupearly_______hecaughttheearlytrain.A.becauseB.orC.sothatD.until41.When_______thePRC______,doyouknow?A.did,findB.did,foundC.was,foundD.was,founded42.What’ssix_________seven?A.multipliesB.multiplyingC.multipliedD.multipliedby43.Mywatchhasstopped.ItseemsthatI’llgoand_____thisafternoon.A.havesomeonerepaireditB.havesomeonetorepairitC.havesomeonerepairitD.haveitrepair44.I’msurethattheirteamwill______ours.A.failB.takeC.winD.beat45.Theflightwasputoff________fog.A.becauseB.astheresultC.asaresultofD.as46.Hewatchedthegamewitha______look.A.surprisingB.surprisedC.surpriseD.surprises47._____thetimehegotup,theroadhadalreadybecoveredwiththinksnow.A.ForB.ByC.AtD.Until48.It’svery________totalkwithhim.A.worthB.rewardingC.deserveD.pleasure49.Tohelpanimalsis_______humansthemselves.A.helpB.helpingC.helpfulD.tohelping50.Haveyouseenthepen______Ihavelost?A.whatB.thatC.whoD.whose51.Theboywastoo_______tomovewhenthetraincamenear.A.afraidB.frighteningC.frightenedD.frighten52.Watermustbekept_______away.A.torunB.runsC.runningD.fromrunning53.Heisthe______ofhisparents.Theyarevery_______ofhim.A.proud,prideB.pride,proudC.pride,prideD.proud,proud54.Mum,myshoesare______.CanIhaveanewpair?A.wearingoutB.wornC.wornoutD.brokenout55._______!Youhavealotoftimetogo.A.Don’trushB.Don’trushoutC.Don’tlookD.Don’tgo56.Hehadlivedinthiscity_______Imovedhere.ButIhearthathewillleavethiscity______ _.A.longbefore,beforelongB.beforelong,beforelongC.longbefore,longbeforeD.beforelong,longbefore57.It’s__________latenow,butIstillhave___________homeworktodo.A.toomuch,toomuchB.muchtoo,muchtooC.toomuch,muchtooD.muchtoo,toomuch58.Hehasgreat________incollectingstamps.A.interestingB.interestedC.interestD.tointerest59.Weshouldmakeacontributionto_______theenvironment.A.improveB.improvingC.changeD.changing60.---MayI_______yourmotorbike,please?---Certainly.Butyoumustn’t______ittoothers.A.lend,lendB.borrow,lendC.borrow,borrowD.lend,borrow61.Thecaptainsofthetwosideswill_______theconversationlater.A.goonB.carryonC.keeponD.gowith62.Willyoupleasemake________forme?Imustbetogetherwithmybaby.A.aroomB.roomC.aspaceD.rooms63.Themachinemustbe________atonce.A.putoffB.putonC.putawayD.putright64.Iwonder_______therainwillstopsoon.A.thatB./C.ifD.what65.IwillhelpyouifI_______.A.amableB.willbeableC.canbeabletoD.amableto66.Ithink_______impossibletolearnEnglishwellinashorttime.A.thatB.thisC.itD./67.Nomatter______,youshouldnotgiveitup.A.whatwillhappenB.whatishappenedC.whathappensD.happenwhat68.Thereisnothing_______withyou.Youneedn’tbeworried.A.thewrongB.matterC.thematterD.theproblem69.Olderpeopleshould__________politely.A.speaktoB.bespokenC.bespokentoD.spokento70.Youshouldhaveatry_______youdon’tknowhowtodoit.A.thoughB.eventhough D.asthough D.even71.Whendoyouthink________?A.willhebebackB.hewillbebackC.willbehebackD.hewillback72.Weusuallyseethesign“ThisSideUp”_______.A.inaroomB.ontheroadC.onaboxD.onaglass73.Iwill_______untilyourfathercomesbackhome.Ihavesomethingimportanttotalk withhim.A.notwaitB.leaveC.waitD.nottowait74.---Thisboyisveryclever.---_________.A.SoisheB.SoheisC.HeissoD.Hesois75.It’snotaneasythingtogiveup_________atmyage.A.smokeB.tosmokeC.smokingD.tosmoking76.HainanIslandistheplace_____,whetheritissummerorwinter.A.togoB.totravelC.tobeD.tovisitto77.Heisafraid_______thebridgebecauseheisafraid_______intothewater.A.tocross,offallingB.ofcrossing,tofallC.tocross,tofallD.ofcrossing,offalling78.HehaslivedandworkedinChina_______1996.A.inB.sinceC.forD.by79.It’sgreatfun_______theyo-yo.Doyouwantago?A.playingB.toplayC.playwithD.playingwith80.Ireallydon’tknowwhat________next.Canyouhelpme?A.todoB.todoitC.doD.doit81.Someonehascalledthepolice,________?A.hasheB.hasn’tsheC.hasn’ttheyD.haven’tthey82.You’dbettergotobedearlyonweekdays,_______you?A.hadn’tB.didn’tC.weren’tD.needn’t83.Myparentswenttowork,leavingme_______thehomeworkathomealone.A.todoB.didC.fordoingD.doing84.Yourpenwrites_______.Wheredidyoubuyit?A.goodB.niceC.neatD.well85.Sheis_______girlthatIhaveeverknown.A.goodB.betterC.thebestD.best86.Welivedahardlife_______.A.inthe1960sB.in1960sC.inthe1960D.in1960s’87.Englishisspoken______theworld.A.alloverB.byC.asD.for88.Allthestudents_______whentheyheardthegoodnews.A.werecheeredB.cheeredC.arecheeredD.cheering89.Modemcanbeusedforconnectingacomputer______aphoneline.A.withB.forC.toD.towards90._______thepopulationbytheyear2050?A.HowmanywillbeB.HowmuchwillbeC.WhatwillbeD.Whatwill91.Yourticketmust_______aheadoftime.A.bookB.bebookedC.orderD.beordered92.Youmust_______try_______makemistakesanymore.A.not,toB./,nottoC./,don’tD./,to93.Don’t_______theseasanymore,orthelivingthingsinthemwilldie.A.litterB.litterintoC.littertoD.litterin94.Inthefirsthalf,wescoredthree_______.A.ballsB.footballsC.goalsD.gamesstyearthebossofalargefactory_______twomillion yuan toourschool.A.gaveinB.gaveupC.gavebackD.gaveaway96.Isawhim_______yourroomwhenIwalkedpastyesterdayafternoon.A.enteringintoB.toenterC.enterD.enterinto97.I’dlikesomething_______English.Couldyoumakesomeforme?A.realB.reallyC.trueD.truly98.Theteachersaidthatlight_______fasterthansound.A.travelledB.istravellingC.travelsD.totravel99.Tocomplaintoooften______agoodthing.A.itisn’tB.thatisn’tC.isn’tD.isn’tit100.Therearemany_______peopleworkingfortheGreatGreenWall.lionlionoflionsoflions【答案与分析】1.D。
初中英语中考英语完形填空易错题精选
初中英语中考英语完形填空易错题精选一、中考英语完形填空（含答案详细解析）1．阅读下面短文，根据短文内容，从短文后各题所给的A, B, C, D四个选项中，选择最佳选项。
Finally, after nearly half a month, the Christmas letter was here in my hand. Yes, writing letters is how my friend in the U.S. and I 1 our greetings every Christmas. People ask why not send our greetings on Facebook, or on WeChat 2 , and by the way, it'll save money. For me, writing letters is more of a 3 habit than a quirk （怪癖） in modern times I, an experienced letter writer. can tell you that writing letters brings me more emotional（情感的）communication.In fact, only parts of our emotions can be found. Some 4 in California State University found that electronic devices, like smart phones, can greatly influence people in many ways. Such devices prevent people from 5 their inner （内心的） feelings. Compared with modern communication, writing letters has more advantages. 6 we write, our brain is given the chance to discover connections between things we didn't see before. And we are 7 to show our emotions fully.If I am here to tell you why I love writing letters, one of the 8 would be its sense of touch-feeling of my hand running through the pages, feeling of pen sliding across the paper, and feeling of the 9 of ink （墨水） in the air.It 10 that both your words and the letter itself can help you express your feelings. Letters build a bridge between the writer and receiver. People experience more when they receive messages in the: form of a letter, rather than any other media.1. A. introduce B. exchange C. describe D. repeat2. A. completely B. recently C. simply D. exactly3. A. natural B. boring C. crazy D. national4. A. composers B. visitors C. inventors D. professors5. A. discovering B. shaking C. spreading D. refusing6. A. When B. Before C. Till D. Though7. A. recommended B. encouraged C. invited D. forced8. A. customs B. reasons C. challenges D. achievements9. A. colour B. quality C. smell D. price10. A. gives out B. breaks out C. comes out D. turns out【答案】（1）B；（2）C；（3）A；（4）D；（5）C；（6）A；（7）D；（8）B；（9）C；（10）D；【解析】【分析】短文大意：这篇短文讲的是在现代社会作者喜欢写信和朋友交流而不使用电子设备，他认为电子设备在很多方面会影响人们，它们会阻止人们表达内心的感情。
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中考易错单项填空题100例1.---Do you know what he did all day?---He spent as much time playing as he _____. A.studying B.was studyingC.studiedD.did studying2.I can’t say ______I want to see him.We haven’t seen each other for a long gime.A.how longB.how soonC.how oftenD.how much3.It is said that land animals ______from sea animals.A.were developedB.developedC.are developingD.develops4.---Would you like some coffee?---Yes .and please get me some milk,too.Iprefer coffee______milk.A.toB.withC.thanD.of5.______made his teacher unhappy.A.Tom came lateB.Tom’s came lateC.Toms’slateD.Tom’s coming late6.Father asked Edison______.A.what was he doing that forB.why he was doing that forC.how he was doing that forD.what he was doing that for7.We are going to have the sports meeting______it ____tomorrow.A.if.rainsB.unless.will rainC.unless,rainsD.when,will rain8.______of the students in our class ______from the country.A.Three fifth,isB.Three fifths ,areC.Third fives,areD.Three five,is9.News can ____every corner of the world with the help of the Internet.A.reachB.arriveC.getD.reachto10.Here is only6 one seat for the old man ______.A.to sitB.sittingC.sitting onD.to sit on11.Though this pair of shoes is a bit expensive,I would like to ______.A.try them onB.try on themC.try them outD.try out them12.How can we finish ____much work in ____a short time?A.so ,so B>such,such C.so,such D.such,sost night, he had his car ______. A.to steal B.stole C.stealing D.stolenst night several young men ____the bank of lots of money.A.stoleB.robbedC.tookD.got15.Where was this big egg ____?A.liedinidy16.______school,we can get much knowledge.A.BecauseB.Thanks forC.Thanks withD.Thanks to17.You’dbetter think about _____a car now.A.whether buyB.if buyC.whether to buyD.if to buy18.He talks too much as if he ____everything.A.knowsB.knewC.has knownD.to know19.He will come to stay with us for _____next month.A.some time sometimeB.sometime some timeC.sometimeD.some times20.This radio program is well worth____.A.listeningB.listening toC.watchingD.to listen21.He must be a doctor,____?A.mustn’t heB.must heC.is heD.isn’t he22.This building is taller than____one around it .A.any otherB.another oneC.anyD.some other23.Though he live ____,he doesn’t feel ____because he can enjoy himself at home.A.lonely,lonelyB.alone,aloneC.alone,lonelyD.lonely,alone24.Yangzhou High School sounds ____a good one.ButI would like to have more information about it.A./B. asC. likeD. what25.---How long ____you ____the English dictionary? ---About half a year.A.have, gotB.did, buyC. have, hadD.have, bought26.____my great surprise.such a little boy can draw so many beautiful pictures/A.InB.WithC.ToD.For27.____the old man spoke.____he became.A.The more,the angryB.The more.the more angrilyC.The more,the angrierD.The most ,the angrier28.____the help of my English teacher,Idid well inEnglish last term.A. UnderB. InC. WithD.For29.She ____a teacher,but now she is a doctor.ed beed to beC.was used to beD.was30.What do you think____him change his mind?A.to makeB.madeC.makeD.making31.They are practising_____in the hall.A.danceB.to danceC.dancingD.to dancing32.It is ____that we all like to read it .A.so good a book.B.such good a bookC.so a gook bookD.such good books33.She often offers ____. with some foodB.some food to us to some foodD.money me34.Most sharks feed ____fish and other animals.A.withB.forC.onD.by35.---Can you look after my daughter for me while I am away?---_____.A.It’s a pleasureB.With pleasureC.Not at allD.You’re welcome36.Can you think of a way ____it?A.doingB.doC.to doD.of do37.I’ll get her ____harder.You wait and see.A.studyB.to studyC.studiedD.studies38.Hearing his mother’s voice,the child couldn’t wait ____out.A.rushingB.to rushC.rushedD.for rushing39.The king____himself from a leaning tree.A.hungB.hangedC.hungedD.hang40.Jim got up early_____he caught the early train.A.becauseB.orC.so thatD.until41.When____the PRC______,do you know?A.did,findB.did,foundC.was,foundD.was,founded42.What’s six ____seven?A.multipliesB.multiplyingC.multipliedD.multiplied by43.My watch has stopped.It seems that I’ll go and _____this afternoon.A.have someone repaireditB.have someone to repair itC.have someone repair itD.have it repair44.I’msure that their team will ____ ours.A.failB.takeC.winD.beat45.The flight was put off ____fog.A.becauseB.as the resultC.as a result ofD.as46.He watched the game with a ____look.A.surprisingB.surprisedC.surpriseD.surprises47.____the time he got up,the road had already be covered with thick smow.A.ForB.ByC.AtD.Until48.It’s very ____to talk with him/A.worthB.rewardingC.deserveD.pleasure49.To help animals is ____humans themselves.A.helpB.helpingC.helpfulD.to helping50.Have you seen the pen ____I have lost?A.whatB.whatC.whoD.whose51.The boy was too ____to move when the train came near.A.afraidB.frighteningC.frightenedD.frighten52.Water must be kept ____away.A.to runB.runsC.runningD.from running53.He is the ____of his parents.They are very ____of him.A.proud,prideB.pride,proudC.pride,prideD.proud,proud54.Mum,my shoes are ____.Can I have a new pair?A.wearing outB.wornC.worn outD.broken out55.____!You have a lot of time to go .A.Don’t rushB.Don’t rush outC.Don’t lookD.Don’t go56.He had lived in this city ____I moved here.But Ihear that he will leave this city____.A.long before,before longB.before long,before longC.long before,long beforeD.before long,long before57.It’s_____late now ,but I still have ____homework to do .A.too much,too muchB.much too ,much tooC.too much,much tooD.much too ,too much58.He has great ____in collecting stamps.A.interestingB.interestedC.interestD.to interest59.We should make a contribution to ____the environment.A.improveB.improvingC.changeD.changing60.---May I ____your motorbike,please?----Certainly.But you mustn’t____it to others.A.lend,lendB.borrow,lendC.borrow,borrowD.lend,borrow61.The captains of the two sides will _____the conversation later.A.go onB.carry onC.keep onD.go with62.Will you please make ____for me ?I must be together with my baby.A.a roomB.roomC.a spaceD.rooms63.The machine must be ____at once.A.put offB.put onC.put awayD.put right64.I wonder ____the rain will stop soon.A.thatB. /C. ifD. what65.I will help you if I____.A.am ableB. will be ableC.can be able toD.am able to66.I thind ____impossible to learn English well in a short time.A.thatB.thisC.itD./67.No matter____,you should not give it up.A.what will happenB.what is happenedC.what happensD.happen what68.There is nothing____with you .You needn’t be worried.A.the wrongB. matterC.the matterD.the problem69.Older people should______politely.A.speak toB.be spokenC.be spoken toD.spoken to70.You should have a try ____you don’t know to do it .A.thoughB.even thoughC.as thoughD.even71.When do you think____?A.will he be backB.he will be backC.will be he backD.he will back72.We usually see the sign”This Side Up “____.A.in a roomB.on the roadC.on a boxD.on a glass73.I will ____until your father comes back home.I have something important to talk wit him.A.not waitB.leaveC.waitD.not to wait74.---This boy is very clever.---______.A.So is heB.So he isC.He is soD.He so is75.It’s not an easy thing to give up ____at my age.A.smokeB.to smokeC.smokingD.to smoking76.Hainan Island is the place____,whether it is summer or winter.A.to goB.to travelC.to beD.to visit to77.He is afraid ____the bridge because he is afraid ____into the water.A.to cross,of fallingB.of crossing,to fallC.to cross,to fallD.of crossing,of falling78.He has lived and worked in China ____1996.A.inB.sinceC.forD.by79.It’s great fun ____the yo-yo.Ko you want a go ?A.playingB.to playC.play withD.playing with80.I really don’t know what ____next.Can you help me ?A.to doB.to do itC.doD.do it81.Someone has called the police,____?A.has heB.hasn’t sheC.hasn’t theyD.haven’t they82.You’ better go to bed early on weekdays,____you?A.hadn’tB.didn’t C/.weren’t D.needn’t83.My parents went to work,leaving me ____the homework at home alone.A.to doB.didC.for doingD.doing84.Your pen writes____.Where did you buy it?A.good B>nice C.neat D.well答案：1.D2.D3.B4.B5.D6.D7.C8.B9.A 10.D 11.A 12.C 13.D 14.B 15.C 16.D 17.C 18.B 19.A 20.B 21.D 22.C 23.C 24.C 25.C 26.C 27.C 28.C 29.B 30.B 31.C 32.A 33.B 34.C 35.B 36.C 37.B 38.B 39.B 40.C 41.D 42.D 43.C 44.D 45.C 46.B 47.B 48.B 49.B 50.B 51.C 52.D 53.B 54.C 55.A 56.A 57.D 58.C 59.B 60.B 61.B 62.B 63.D 64.C 65.D 66.C 67.C 68.C 69.C 70.B 71.B 72.C 73.C 74.B 75.C 76.C 77.A 78.B 79.D 80.A 81.D 82.A 83.D 84.D。