试卷错题集1
错题集一(刘金娥2014.9.16-9.18)1
错 题 集 一编写 ：刘金娥时间：2014 . 9 .16-9.181.环己烷可制备1，4-环己二醇，下列七步有关反应（其中无机产物都已经略去）中，其中有两步属于取代反应，两步属于消去反应，三步属于加成反应，试回答：（1）反应 和 （填写序号）属于取代反应。
（2）写出下列化合物的结构简式：B ：C ：（3）反应④所用的试剂和条件分别为： ， ； （4）写出①、④的化学方程式：①： ； ④： 。
【答案】：（1）①、⑥ （2）B ： C ：（3）NaOH 醇溶液，加热；（4）①：；④：2、下图为苯和溴的取代反应的改进实验装置图。
其中A 为具支试管改制成的反应容器，在其下端开了一小孔，塞好石棉绒，再加人铁屑少量。
填写下列空白：（1）向反应容器A 中逐滴加入溴和苯的混合液，几秒钟内就发生反应。
写出试管A 中所发生反应的化学方程式（有机物写结构简式）_____________________________________； （2）试管C 中苯的作用为________________________________________；（3）反应2至3min 后，在盛NaOH 溶液的B 中可观察到的现象为_________________________； （4）在上述整套装置中，具有防倒吸作用的仪器有____________________（填字母）； （5）改进后的实验有a 、步骤简单，操作方便，成功率高；b 、药品用量少；c 、各步现象明显；d 、对产品便于观察这4个优点，还有—个优点为_______________________________； （6）能说明苯与溴发生的是取代反应而不是加成反应的现象为_________________________。
NaOH 溶液苯AgNO 3溶液 石蕊试液【答案】（1）（2）除去HBr中混有的Br2；（3）溶液底部有无色油滴（4）DEF；（5）整套装置在密闭系统中进行，不会造成环境污染；（6）D中石蕊变红或E中产生淡黄色沉淀3．下列各组物质中，全部属于纯净物的是（）A．福尔马林、白酒、醋B．丙三醇、氯仿、乙醇钠C．苯、汽油、无水酒精D．甘油、冰醋酸、煤[参考答案]B4．下列各组物质中，属于同系物的是（）A．硬脂酸、软脂酸B．CH3COOH、C3H6O2C．D．HCHO、CH3COOH[参考答案]A３5 ）A．乙醛、乙酸B．甲酸乙酯、丙酸C．CH3CH2CHO、D．CH3CH2CH2OH、CH3OCH2CH3[参考答案]A6．乙醇分子中各化学键如图所示，对乙醇在各种反应中应断裂的键说明不正确的是（）A．和金属钠作用时，键①断裂B．和浓硫酸共热至170℃时，键②和⑤断裂C．和乙酸、浓硫酸共热时，键②断裂D．在铜催化下和氧气反应时，键①和③断裂[参考答案]C7．下列说法中，正确的是（）A．含有羟基的化合物一定属于醇类B．代表醇类的官能团是与非苯环上的碳相连的羟基C．酚类和醇类具有相同的官能团，因而具有相同的化学性质D．分子内有苯环和羟基的化合物一定是酚类。
有理数错题集(1)
A.4
B. 3
C .2
D. 1
D
[分析]
先把各数根据绝对值的性质求出，再根据负数的定义进行判断，即可得出答案．
[解答]
解：|-21-1
1 2
|=22
1 2
，-(
2 3
)=-
2 3
，+|-5|=5，
2 则负数有-( 3 )，有1个负数；
故选D． [点评]
此题考查了正数和负数、绝对值，解题的关键是根据绝对值的性质求出各数，再
第10题：
|-2|的相反数为( )
A.-2
B. 2
C
.
1 2
பைடு நூலகம்
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错题导出
D. -
1 2
A [分析]
利用相反数，绝对值的概念及性质进行解题即可． [解答] 解：∵|-2|=2， ∴|-2|的相反数为：-2． 故选A． [点评]
此题主要考查了相反数，绝对值的概念及性质．相反数的定义：只有符号不同的 两个数互为相反数，0的相反数是0；求出|-2|=2，再利用相反数定义是解决问题的
关键．
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根据负数的定义进行求解．
第8题：
在， ，
，
)。 A.1个 B. 2个 C .3个 D. 4个
，， ，
， 中，正整数的个数是(
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C [解析] 本题主要考查有理数的基本概念和绝对值的概念。
正整数是指除 以外的自然数。因此题干中 不是正整数；
错题导出
第1题：
若m是有理数，则|m|+m的值( ) A.不可能是正数 B. 一定是正数 C .不可能是负数 D. 可能是正数，也可能是负数 C [分析] 根据绝对值的性质：正数的绝对值是它本身、负数的绝对值是它的相反数、0的绝 对值是0，可根据m是正数、负数和0三种情况讨论． [解答] 解：①当m＞0时，原式=m+m=2m＞0； ②当m=0时，原式=0+0=0； ③当m＜0时，原式=-m+m=0． ∴|m|+m的值大于等于0， 即为非负数， 故选：C ． [点评] 本题主要考查绝对值的性质，能够通过讨论去掉绝对值符号是解决本题的关键， 难度不大．
人教二年级数学下册王朝霞错题集（1）
⼈教⼆年级数学下册王朝霞错题集（1）王朝霞错题集⼀、填空题。
1. 40÷8=（），⽤的⼝诀是（），表⽰把（）平均分成（）份，每份是（），还表⽰40⾥⾯有（）个（）。
2. 58÷7=□……□□÷7=6……5 36÷□=□ (4)25÷□=4……□3. 有下⾯的五个数： 4050 4005 4500 5040 5400⑴这五个数中只读⼀个0的数是（）⑵这五个数中⼀个0也不读的数是（）4.在（）⾥填上合适的数。
10千克-8千克=（）克5. 把43+29=72,72÷8=9合并成⼀个综合算式是（）。
6. 1瓶⽔可以倒6杯，有28个客⼈，每⼈1杯⽔，⾄少需要（）瓶⽔。
7. 由6个千、4个百和90个⼀组成的数⼗（）；2500⾥⾯有（）个百。
8. 与1000相邻的两个数是（）和（）。
9. 6⽉份有30天，，相当于（）个星期，余（）天。
10. 把12+13=25和56-25=31合成⼀个算式是（）。
11. 在有余数的除法算式□÷8=5……□中，被除数最⼤是（），被除数最⼩是（）12. 在右边的⽅格中，每⾏，每列都有5～8这四个数，并且每个数在每⾏，每列都只出现⼀次，A应该是（），B应该是（），C应该是（）。
13. △÷○=7……8，当○最⼩时，△=（）14. 7个碗12根筷⼦，可以给（）位客⼈。
15. 3800⾥⾯有（）个百，29个百是（）16. 1942⾥⾯有（）个千，（）个百，（）个⼗和（）个⼀。
17. 在1602, 1089, 1006, 1390, 1500这⼏个数中，只读⼀个零的有（）个，⼀个零不读的有（）个，把这⼏个数按照从⼤到⼩得顺序排列起来是（）＞（）＞（）＞（）＞（）１８．在□⾥最⼤能填⼏？９□４＞９８０１５８＞１□６９×□＜３０４２＞６×□19. 5500克=（）千克（）克3543克=（）千克（）克⽐48千克多9千克是（）千克，25千克⽐81千克少（）千克20. ⽤0、7、4、8组成最⼤四位数是（），它接近的整千数是（）；组成的最⼩四位数是（），它接近的整千数是（)21. 三班的同学排队坐缆车，每辆缆车坐4⼈，笑笑排在第16位，她应该坐第（）辆缆车，淘⽓排在34位，他应该坐第（）辆缆车。
初一错题集1
初一错题集 Unit1-41.They have some rulers in their bags.(同义句)2.Are you ?Yes, we are brothers.(twin)3.You (not be) friendly to your classmates.4.What does your father often to you? He often tells me not to inclass.A.s ay talkB.talk sayC.say sayD.talk talk5.My father with me (fly) a kite every Saturday.6.It takes about ten minutes to walk to the museum.(对划线部分提问)to walk to the museum.7.Our school is near the zoo.(同义句)Our school is the room.8.Please take your books after school.A.t o homeB.your homeC.homeD.at home9.Lily’s watches sports news at night.A.twins brother;much tooB.twin brothers;too muchC.twin brother;too muchD.twins brothers;too many10.I usually sit the classroom,so that I can hear the teacher who likes to standthe class clearly.A.i n front of;in the front ofB.in the front of;in front ofC.in front of;in front ofD.in the front of;in the front of10.I hope you and your family .A.w ellB.are well lC.fineD.are good11.Yao Ming, (like)his parents, (like)playing basketball very much.12.The supermarket (close)at 9p.m..It is (open)between 9a.m.and 9p.m..So it is (close)from 9p.m. to 9a.m..13.(read) English every day. (read)can help you improve( 提高)yourEnglish.(read)14.Would you (go) to the zoo tomorrow.15.Do you often do your homework after (have)dinner.16.My favourite fruit (be)apples.17.There are different kinds of kites (fly)in the sky.18.If a girl doesn’t know wear,she can ask her best friend for help.A.what toB.how toC.what canD.how can19.What’s your family like? .A.They are kind.B.It’s a happy one.C.They are tall.D.They like sports.20.He is never late for school? ,he is always the first to get to s chool.A.Yes,he does.B.No,he isn’t.C.Yes,he is.D.No,he doesn’t.21.The books are one of my (hero).Jerry Lin Shuhao is one of jimmy’s(hero).He plays basketball well.22.Look!Each girl in our class (have)a new shirt now.23.(chat)with each other online is fun.24.He is one of the (good)students in our class.25.She does (well)in swimming of us three.26.does Andy’s father look? He looks strong and tall.A.HowB.WhenC.WhereD.What27.Mary;s daughter looks good the dress.A.w ithB.inC.onD.at28.I go to school on weekdays.(同义句)29.What do you get (介词)your birthday?30.Good morning (介词)you.31.What about (wake) (he)up?He has much homework(do).32.We have fun (chat)with each other at lunch.33.Would you please (not shout)in the library, it’s not polite.34.Look,the window is (open)now,please close it.37.Mum (get)ready for supper,while I (write)my home.38.I hope you our home one day,Daniel.A.to visitB.visitC.will visitD.are visiting39.41.Here for you.A.are some good newsB.is some good newsC.are some piece of good newsD.is some pieces of good news.42.There are many flowers on sides of the street.A.eachB.everyC.bothD.all43.Let’s(be) at home together this afternoon.44.There are some pictures the wall and some windows the wall,too.A.on onB.on inC.in onD.in in45.Jill, (not be)late for the meeting.46.Is the girl a dress your classmate?A.toB.onC.inD.with47.48.are good friends.A.I you and DickB.Dick you and IC.You I and DickD.You Dick and I49.Look at today’s newspaper.Some news really interesting.A.doesB.isC.areD.do50.We should “thank you” when someone lends something to us.A.tellB.speakC.sayD.talk51.She has a sister,and he has ,too.A.the oneB.onesC.oneD.her52.One of the students often her with her English in the class.A.helpB.to helpC.helpingD.helps53.I that I can send my best to Kitty on New Year`s Day.Wonderful! I believe your dream on that day .A.hope, wish, comes trueB. hope, wishes, comes trueC. wish , wishes, comes trueD. wish, hopes , come true.54.Excuse me , could you English in class?Yes, of course. I am very good at English stories.A.Say, talkingB. tell, sayingC. Speak, tellingD. Tell, speaking55.Who sports in your family? My brother and I .A.Likes, isB.like, amC. Like, areD. Likes, do56.I live far away from the school and I often a bus to school. What about you?I go to school , it takes me about ten minutes.A.by, on bikeB. take, by bikeC. by, ride a bikeD. take, ride a bike.57.We have a (parent) meeting once a month.58.Today is Teacher`s Day, best to you ,Miss Wang.59.The students go out for a trip twice a week. (对划线部分提问)do the students go out for a trip?lie does after-school activities in the afternoon. (否定句)Millie61.I can`t hear you after-school activities in the afternoon.(good) on the phone.62.Where your family (have) breakfast on Sundays.63.I have daughter.A.A eight-year-oldB. eight years oldC. An eight-year-oldD. Eight-years-old64.They come from . They are (英国)65.He with his family in Nanjing now. (live)66.He often others, and he is (help)67.How many are there in your school? (年级)68.Look, the window is (open) now, please close it.69.There is no salt in the kitchen. Would you like t o get ?A.itB. oneC. someD. any70.Don`t make Kitty that. She is tired. (do)71.72.She every day.A.Walk homeB. Walk to homeC. Walks homeD. Walks to home73.What (其他的) do you want to drink?74.One of the boys (play) football now.75.the girls like badminton? (like)76.American people usually rice.(eat)77.78.It is fun (read) an (interest) book.79.We have fun (travel) all over the world.80.The parents` meeting begins two o`clock the afternoon November 15th.A.at , in , ofB. At, on , on ,C. At, on , ofD. In , in , on。
七下数学错题集(1)
七下数学错题集
1. 已知，AD∥BC, ⊿ABD的面积为5，⊿AOD的面积为2，那么⊿COD 的面积为（）。
2. 经过点P（-1,5）且垂直于X轴的直线可以称为直线（）。
3. 等腰三角形腰上的高与另一条腰上的夹角为50度，那么等腰三角形的底角为（）。
4. 3.1416-∏的绝对值是（）。
5. 一个地方的混凝土总量约是186000立方米，保留两个有效数字，近似数186000用科学计数法可表示为（）。
6. 如图，已知AB∥CD，角A=58度，那么角ECD=（）度。
7. 在等腰三角形ABC中，AB=6cm，BC=10cm，那么AC=（）cm。
8. 如图，在三角形ABC中，已知AB=AC，∟BAD=∟CAE，点D、E在BC上，试说明⊿ADE是等腰三角形的理由。
9. 一个正方形的花坛的边长为3M，扩建后的正方形花坛比原来的面积增加了16平方米，扩建后的花坛边长比原来增加了（）米。
10. 如图，已知AB、CD相交于点O，AC∥DB,OC=OD,E、F为AB上的两点，且AE=BF.说明（1）AO=BO ; (2)CE∥DF.
11. 如图，已知AC=BC=CD，BD平分∟ABC,点E在BC的延长线上，
（1）试说明CD∥AB的理由
（2） CD 是∟ACE的角平分线吗？为什么？。
上海初三倪紫娟错题集1
倪紫娟错题回顾及新诊断练习练习1Part 2 V ocabulary and Grammar (第二部分词汇和语法)II.错题回顾练习：说明：1-9题选自九年级课课练上Unit5 B卷,10-20题选自金牌教练Unit5 the human brain. Choose the best answer (选择最恰当的答案): (共20分)1.I’m terribly sorry, but I have forgotten __________ the tickets with me.A.to bringB. bringingC. to takeD. taking2.This exercise is not difficult. I ________ any help.A. needn’tB. needC. need not toD. don’t need3. Since next term sports meeting will ________ in our school, we should make our school _______ .A. take place, more beautifulB. be taken place, more beautifulC. take place, more beautifullyD. be taken place, more beautifully4. My bicycle is broken. I’ll ____________A. have it repairB. have it repairedC. have it repairingD. have it was repaired5. ________ good piece of advice he has given us!A. WhatB. What aC. HowD. How a6. It was very noisy outside, so my father went out to see __________ .A. what happensB. what was happeningC. what will happenD. what was happened7. Don’t worry. You __________ your room in a minute.A. will showB. will be shownC. are shownD. show8. ____________ the students attended the lecture in the hall yesterday.A. About two hundred ofB. More than two hundredsC. Over two hundreds ofD. Hundreds of9. She told me to take either of the skirts and leave ___________A. anotherB. otherC. the otherD. the others10. This term Miss White will teach _______ English instead of Mr Black.A. theyB. themC. theirD. theirs11. For the time being, some newly-produced mobile phones can take photos _____ a camera.A. ofB. forC. likeD. as12. Now can you ________ the difference between the two words?A. tellB. talkC. sayD. speak13. _________ Spring Festival Eve, people in China usually have a big dinner with families.A. InB. OnC. AtD. By14. The music sounds __________ . I enjoy every minute of it.A. wellB. beautifulC. boringD. wonderfully15. How much money did you ________ all these things?A. takeB. giveC. spendD. pay for16. You will not pass the examination ________ you work hard at your lessons.A. ifB. beforeC. untilD. unless17.---Why don’t you like the speech?--- It’s ____________ one that I have ever listened to .A.such an interestingB. more interestingC. the most interestingD. the least interesting18.Jim’s grandpa _________ for ten years .A. diedB. was deadC. has diedD. has been dead19. Try to memorize these new words in a short time.（选出划线部分最佳解释）A. understandB. unable to rememberC. forgetD. learn… by heart20. She made a dramatic speech at the meeting. （选出划线部分最佳解释）A. an excitingB. an excitedC. a longD. a dull(Answers:1-5 ADABB.6-10 BBACB 11-15 CABBD 16-20 DDDDA )中考诊断练习：31. Could I have an early morning call ________six o'clock tomorrow?A) on B) to C) at D) in32. We have decided to try ________ best to raise more money for the local charity.A) us B) our C) we D) ours33. You really don't have to worry ________ your weight. You look just right.A) for B) from C) with D) about34. I can't connect my computer to the Intemet. There must be ______ wrong with it.A) something B) everything C) anything D) nothing35. The baby feels _________ while his mother holds him in her arms.A) save B) safe C) safely D) safety36. Pudong International Airport is one of airports in the world.A) big B) bigger C) biggest D) the biggest37. Martin and his friends didn't eat up all the food they ordered, __ they took the rest away.A) for B) or C) so D) as38. Peter will cook for his parents __ the International Day' of Families comes.A) unless B) when C) until D) though39. With the help of the new technology, you __ e-mail your friends by mobile phone.A) can B) must C) need D) should40. ______ Tony_______ Frank likes the CD. They think the music is too noisy.A) Neither...nor B) Either...or C) Both...and D) Not only...but also41. Stop ______ about the traffic. Just think about what we can do to improve it.A) complain B) to complain C) complaining D) complained42. Don't jump to a conclusion! Let's __ the problem first.A) to discuss B) discuss C) discussed D) discussing43. -- ______do millions of online users visit the home page of the government?-- To read the news and search for the information they need.A) When B) Where C) Why D) What44. The volunteers __ a lot of help to the community for nearly ten years.A) offered B) will offer C) are offering D) have offered45. The students the Art Festival when I passed by their school.A) celebrate B) were celebrating C) will celebrate D) have celebrated46. Jenny told me that she __ an English Speech Contest the next month.A) takes part in B) is taking part in C) took part in D) would take part in47. ______ wonderful concert they are putting on in the city square!A) How B) What C) What a D) What an48. I'm sure that stricter roles to control cigarette smoking very soon.A) made B) will make C) were made D) will be made49. -- Shall we join in the Green World Summer Camp?--_________A) Good idea. B) You're welcome. C) Not at all. D) Never mind.50. -- Congratulations! You've got a chance to be an exchange student!--________A) Thank you. B) I agree. C) Of course. D) Good luck.II: C B D A B D C B A A C B C D B D C D A Aplete the following passage with the words or phrases in the box. Each can only beused once (将下列单词或词组填入空格。
英语五年级错题集(一)
1. Look at the boys! What（）they（）there?A. are; doB. do; doesC. are; doing2. Please send me an email （）**************************.A. inB. toC. at3. — What's Tom like?—（）.A. He's cleverB. He's a studentC. He's good at sports4. — When is the summer vacation?— It's in （）and （）.A. April; MayB. July; AugustC. May; June5. Miss Li is my （）Chinese teacher.A. oneB. firstC. the first6. 阅读短文，判断句子正（T）误（F）Traffic lights are the same in every country. There are three lights—red, yellow, and green. Red means “stop”. Yellow means “wait”, and green means “go”. In China, people drive on the right side of the road. But in Britain, Japan and Australia, people drive on the left side of the road.(1). ( )The traffic lights are the same in every country.A. TB. F(2). （）Yellow means “wait”.1A. TB. F(3). （）In China, people drive on the left side of the road.A. TB. F(4). （）In Australia, people drive on the left side of the road.A. TB. F(5). （）Red means “go”.A. TB. F7. Many people like collecting(收集) things. For example, they like collecting stamps, books, pictures. But my friend Mr. King likes collecting clocks. He has five hundred clocks now. There are clocks everywhere in his house. You can see shelves standing in every room. All the shelves are full of clocks. Though Mr. King is glad to do this, his wife doesn't enjoy it at all. She has a lot of work to do every day. It's not easy for her to clean hundreds of clocks. She is also angry at the noise. Each clock keeps its own(自己的) time, so she can hear clock strike(敲) almost any time during the day and night. "There's something even worse. I'm never able to know what time it is with so many clocks around!"(1).Mr. King is.A.a clockB.a clock sellerC.interested(感兴趣的) in clocksD.good at repairing clocks(2).Which of the following sentences is right?A.Mr. King keeps the clocks only in his bedroom.2B.His wife likes collecting clocks, too.C.There're some shelves with nothing on them. D.All the shelves are full of clocks.(3).Mrs. King .A.is busy cleaning the clocks every dayB.likes collecting clocks, tooC.helps Mr. King collect clocksD.likes cleaning the clocks(4).Mrs. King doesn't know .A.her husband's favourite thingB.which clock tells the right timeC.when the clocks strikeD.how to clean the clocks(5).From the passage(段) we know .A.few of the clocks keep the right timeB.most of the clocks keep the right timeC.all the clocks strike at the same timeD.3it's always quiet in their house8. FriendsOne day, Mike and Jack are walking in the forest. "We are good friends. If (要是) we meet a bear, I will help you." Mike says. "I'll help you, too." Jack says. Later, there is a big bear in front of them. Mike and Jack run very quickly. Then Jack climbs up a tree and forget (忘记) all about his friend. Mike is too fat and he lies down (躺) on the ground and closes his eyes. "The bear will think I'm dead (死的)." The bear comes up to Mike and looks at him, puts his nose to Mike's ears. The bear thinks Mike is dead, so it goes away.Jack comes down from the tree with a smile (微笑), and he asks his friend. "What does the bear say to you?" "The bear says, 'A friend in need is a friend indeed.'"(1).Mike and Jack are walking .A.in a mountainB.in the forestC.on a farmD.by a river(2).They meet a in the forest.A.dearB.big tigerC.big bearD.reptile(3).climbs up a tree quickly.A.4JackB.MikeC.The bearD.Jack and Mike(4)."A friend in need is a friend indeed" means (意思是) in Chinese.A.莫逆之交B.患难见真情C.情同手足D.肝胆相照(5).Which is NOT RIGHT (不对)?A.Jack climbs up the tree and Mike lies down on the ground.B.The bear can't climb the tree.C.The bear says to Mike, "A friend in need is a friend indeed."D.They are walking in the forest.9. 阅读短文，选择正确答案。
高二错题集一
错题集一姓名：日期：1.集合A=，B=，C=，D=，若a，b B，则有（）A. a+b AB. a+b BC. a+b CD. a+b D2. 已知f(x)是定义在R上的偶函数，当x>0时，f(x)是增函数，若，则下列各式中一定恒成立的是（）A. f()+ f()>0B. f()+ f()<0C. f()+ f()>0D. f()- f()<03.等比数列a+，a+，a+的公比是 .4.y=2sin(-3x+)的增区间是 .5.已知函数f(x)的图像如图所示，下列数值排序正确的是（A. 0<<<B. 0<<<C. 0<<<D. 0<<<6.已知k<-4，则函数y=-2的最小值是 .7.已知函数f(x)=，当x=2时取得最大值，则f(1)+ f(2) + f(3)+…+ f(2018)的值为 .8.函数y=cosx|tanx|(0，x)的图像是( )9.在ABC中，角A，B，C所对的边分别为a，b，c，且，，则的值为 .10.在平面直角坐标系中，O为原点，A(-1，0)，B（0，），C(3，0)，动点D满足，则的最大值是 .11.已知函数，x=-为零点，x=为y=图像的对称轴，且在（，）上单调，则的最大值为（）A. 11B. 9C. 7D. 512.已知函数f(x)满足f(x+1)=若f(0)=2006，则f(2005)= .13.已知函数f(x)=2sin()图像的一个对称中心为（，）其中为常数，且，若对任意的实数x，总有f()f()，则的最小值是 .14.在ABC中，若-•=•-•，则ABC是（）A. 等边三角形B.锐角三角形C. 直角三角形D. 钝角三角形15.若a,b 是非零向量且满足（a-2b)⊥a，(b-2a)⊥b，则a与b的夹角θ的大小为 .16.若cos（α-β）=，cos2α=，并且α、β均为锐角且α<β，则α+β的值为 .17.在ABC中，AB=3，AC边上的中线BD=，•=5，则AC的长为 .18.在平行四边形ABCD中，AD=1，∠BAD=60°，E为CD的中点，若•=1，则AB的长为 .19. 在ABC内有一点O，且满足+2，则= .20.若M为ABC所在平面内一点，且满足（）•（）=0，则ABC 形状为（）A. 等腰三角形B.直角三角形C. 正三角形D. 等腰直角三角形21.已知A,B均为钝角，sinA=，sinB=，则A+B的值为 .22.若sinθ，cosθ是方程4的两根，则m的值为 .。
英语初一错题集 (1)
英语纠错1、I have P.E （）the aftertoon of Tuesday.A in b. for c.on d.at2、----happy new year !------------( )a.I knowb.The same to youc.I am fined.Thank you3、It is ( )to play football.a.funsb. a func.fund.funny4、I have breakfast ( ) 6:30 every morning.A.at around b. around at c.in around d. around in5、WHEN ( )he ( )(have) P.E.6、The girls like music because it is exciting 对划线部分问7、We have six ( )课in a day.8、It has about four ( ) students.a.hundredb.hundred ofc. hundredsd.a hundred9、Mr.mang is strict ( ) his work. He is strict ( ) his studentsa.in ;in b with; in c in; with d with;with10|、（）interesting movie it is! All of us want to see it again.a.Whatb. how anc.how dwhat an11、The last day of a week is ( ).a.Fridayb. Saturdayc. Sunday d Weekend12、( ) favorite subject is history.a. heb.himc.his friendd.his friden’s13、He goes to bed at about ten. 提问14、I am sun his favorite fruit is apples. 变一般疑问句。
高考英语语法总复习----错题集(1)
高考英语语法总复习----错题集〔一〕1.It was 2 hours’ wait by the time the announcement _____, saying my flight was cancelled.A. had been madeB. madeC. was madeD. was making2.She went on with her search, knocking on each door before entering the room ____ the guestwas perhaps asleep.A. in caseB. even ifC. so thatD. as though3.What made the parents worried most was that little Helen did nothing but _____ all day longand always made a lot of trouble.A. to playB. playedC. playD. playing4.Those successful deaf dancers dancing is an activity _____ sight matters more than hearing.A. whenB. whoseC. whichD. where5.Strawberries can, of course, be frozen but they taste best when bought and eaten ____.A. freshlyB. freshC. more freshlyD. fresher6.–We did not see him at the lecture yesterday.-- You ____ him, since I went to an international conference with him.A. mustn’t have seenB. needn’t have seenC. couldn’t seeD. can’t have seen7.Venus has a dense atmosphere, _____ we know very little.A. its compositionB. about whose compositionC. about which compositionD. whose composition8.______ his capability in dealing with different kinds of people, he was appointed chairman ofthe committee.A. Being consideredB. ConsideringC. To be consideredD. Having considered9.Operations which ____ patients exhausted and in need of long periods of recovery time arenow making them feel relaxed and comfortable.A. leaveB. had leftC. will leaveD. left10.With all the magazines I needed _____, I left the post office.A. boughtB. to buyC. buyingD. to be bought11.Most students in our class prefer taking pains in our studies to ____ with a better education.A. equipB. equippingC. be equippedD. being equipped12.I found that my cheating in yesterday’s English test _____ to my parents that very evening.A. was reportedB. had been reportedC. had reportedD. was reporting13.The computers made by our company sell best, but several years ago no one could haveimagined the role in the markets that they ______.A. were playingB. were to playC. had playedD. played14.After supper she would sit down by the fire, sometimes for ____ an hour, thinking of heryoung and happy days.A. as long asB. as soon asC. as much asD. as many as15.With _____ left, it doesn’t seem likely that the young girl will be able to reach the airportahead of schedule.A. so short timeB. such short a timeC. such a short timeD. so a short time16.Try to avoid such things ______will do you harm, unless you don’t care about the rumorsfrom all directions.A. thatB. asC. whichD. as that17.I glanced over my shoulder at the young woman who sat _____ me reading a newspaper.A. againstB. in front ofC. oppositeD. behind18.An old saying goes that no bread eaten by man is as sweet as _____ earned by his own labor.A. oneB. thatC. itD. such19.I’d like to take down your name and address in case you _____ as a witness.A. will be neededB. needC. are neededD. will need20.The number of the people present at the party was ____ than expected, so there was muchfood left.A. much moreB. much smallerC. much largerD. many more21.His grandfather was born and brought up in _____is now called an economic developmentzone.A. whatB. whereC. whichD. that22.If a computer breaks down, you will lose the file you ____ if you don’t save it regularly.A. are processingB. processC. will processD. processed23.Parents who stay actively ___ with their children, showing interest in their activities andparticipating when possible, earn the respect and appreciation of their children.A. involveB. involvingC. to involveD. involved24.Indeed the best leading actor has read a lot of books, but the best supporting actress has readno _____.A. moreB. fewC. lessD. little25.Although the causes of cancer _____, we do not yet have any practical way to prevent it.A. are being uncoveredB. have been uncoveringC. are uncoveringD. have uncovered26.The newly concluded National People’s Congress has passed a package of economic policies_____ 8% of yearly economic growth.A. targetB. to targetC. targetingD. targeted27.Hardly _____ aware that the lion was approaching her before her dog began to bark.A. she wasB. would sheC. would she beD. was she28.Students’ complaints ____ too much study burden were soon taken into consideration by theschool.A. ofB. forC. inD. with29.The man had expected to see all his relatives when in hospital, but ____ came to see himwhile many of his friends offered him their help.A. noneB. no oneC. someoneD. anyone30.There _____ be any difficulty in passing the oral test since you have practiced a lot in theschool.A. mustn’tB. shan’tC. shouldn’tD. needn’t31.Besides the Internet, television is anther major way of communication ____ us to see theperformer as well as to hear the voice.A. permittingB. to permitC. being permittedD. permitted32._____ two tickets for the new play at the Grand Theater on Saturday. Shall we go and enjoy ittogether?A. They have been givenB. I have been givenC. I am givenD. They have given to me33.After a long journey across the whole Europe from north to south, they found themselves ___out as well as their clothes.A. wearB. woreC. wearingD. worn34.The hostess dressed in her finest costume together with the guests ____ comfortably in theliving room.A. was seatedB. was seatingC. were seatedD. seated35.Even if you offered ____ you have just offered, I would not sell it to you.A. the money twice thatB. twice whatC. twice the money whatD. twice as much36.Investigators agreed that passengers on the airliner ____ at the very moment of the crash.A. ought to dieB. must have diedC. must be dyingD. should have died37.He introduced a lot of new devices, ____ much time and labor.A. only to saveB. thus savingC. only savingD. having saved38.Motorists used ____ to the radio or their favorite tunes on CDs may have a new way to entainthemselves, after engineers in Japan developed a musical road surface.A. to listenB. to listeningC. for listeningD. to be listening39.A walk through the rainforest is not ecotourism ____ that particular walk somehow benefitsthat environment and the people who live there.A. ifB. thoughC. unlessD. as40.Throughout the history of the Olympic Games, ordinary men and women have showedextraordinary sportsmanship, _____ it is an athlete helping to fix the bicycle of his opponent or two athletes from warring nations walking arm-in-arm before the world.A. no matterB. whetherC. provided thatD. whatever41.The study you have been making ____ the ancient Chinese characters is an instructive job.A. toB. forC. ofD. from42.Yassin’s death was not ____ to stop Hamas’ attempt _____ terror attack.A. hoped, carrying onB. expected, launchingC. hoped, to carry onD. expected, to launch43.What is the way George thought of ____ enough money to buy the house?A. to getB. gettingC. having gotD. being got44._____ waking from a dream, Silicon Valley has suddenly realized that the ____ economymeans trouble for his companies.A. Although, collapsingB. As if, collapsedC. Although, collapsedD. As if, collapsing45.The man showed us such a heavy stone ____ no man could lift.A. thatB. asC. whichD. and46.The professor can hardly find sufficient grounds ____ his argument.A. which to be based onB. on which to baseC. which to be basedD. which to base47.The women carrying babies, come in first, _____?A. will youB. will theyC. do youD. don’t you48.Pleasant music is often played ____ classes to make students refreshed and relaxed for awhile.A. betweenB. amongC. overD. after49.When you have finished reading the novel, you will find the hero ____.A. a person too perfect to be not trueB. a too perfect person to be trueC. too perfect a person to be trueD. too perfect a person to be not true50.When I entered the living room, Mother didn’t say anything, but I noticed a _____look comeover her face.A. surpriseB. surprisedC. surprisingD. surprisingly51.Having lived in the village for so long, these young men have already gone _____.A. to nativesB. nativeC. nativelyD. natives52.There is hardly an environment on earth ____ some species of animal or other has not adaptedsuccessfully.A. to whichB. whereverC. so thatD. that53.____ at the news that he sank into the chair and remained motionless for several minutesbefore regaining control of himself.A. So was John scaredB. So scared was JohnC. So much did John scareD. John scared so much54.Our neighbor ____ the street has decided to hold a garden party despite cold weather.A. acrossB. oppositeC. alongD. in55.Until the very latest moment of his existence, man has been bound to the planet ___ heoriginated and developed.A. on whichB. whatC. in whichD. in what56.They have started an investigation, ____ are being kept secret.A. the detail of whichB. of which the detailsC. and the detailD. the details of it57.I got in his old truck and off ____ to one of the far corners of the farm to fix the fences.A. did we goB. we wentC. we did goD. went we58.I was the middle child of three, and there was a gap of five years on ____ side.A. oneB. eitherC. bothD. none59.The most common way we have of showing other people ____ are more important is bymaking ourselves smaller than they are.A. whoB. /C. thatD. they60.–Shall I get you something from the supermarket?-- Oh, let me see, ____ please.A. food of a week worthB. food of a week’s worthC. a week worth foodD. a week’s worth of food61.Now that energy prices are rising so rapidly, further prices are much uncertain, and the risk____ a new investment depending on them may fail is greater.A. by whichB. ofC. thatD. in that62.Until last century _____ heard of online education.A. many Americans had neverB. had many Americans neverC. many Americans hadD. had many Americans63.Discovery in a South African cave suggests that modern human behavior ____ much earlierthan ____.A. begin, previously thoughtB. began, previously thoughtC. should begin, previously thinkingD. began, previously thinking64.____ think of their plan, no one can deny that they are bold and have much imagination.A. Whatever we mayB. No matter how we mayC. Much as we mayD. If we may65.How can a country where teachers devote all their class hours to training students to takeexams _____ to compete in the technology race with other countries?A. expectB. expectingC. being expectedD. be expected66.All women want to escape from the kitchen, ____ the limited place ___ society expects themto fill.A. which, thatB. /, whereC. where, whichD. /, /67. The old man was sitting in a wheelchair all day because his broken leg suffered after a fallmade ____ difficult.A. it walkB. to walkC. walkingD. it to walk68. The new Hukou(户口)policy, according to some experts, ____ to attract more high-end talentsto contribute to Shanghai’s development.A. servesB. servingC. to serveD. is served69. Electrolysis(电解)is the process _____ electric current is passed through a substance to cause achemical change.A. whichB. whoseC. to whichD. by which70. The Apple Company had scarcely released i-Phone ____ it became one of the best-sellingelectronic products.A. thanB. beforeC. whileD. when71. He no longer lives on campus, for he ____ an apartment within the walking distance to theschool.A. will rentB. rentedC. has rentedD. had rented72. With his good sense of direction, he _____ quickly and easily get round in the new city.A. canB. mustC. shouldD. need73. An excellent way to help memory is to connect information with pictures, which ____ as amemory-link method.A. considersB. is consideringC. is consideredD. considered74. The airline has a booklet ____ will tell you most of the important information to Europe.A. in whichB. about whichC. /D. that75. Several weeks had gone by ____ the head of the gallery realized the painting was missing.A. afterB. beforeC. sinceD. that〔一〕答案1-5 CACDB 6-10 DBBDA 11-15 CABAC 16-20 BDBCB 21-25 AADCA26-30 CDAAC 31-35 ABDAB 36-40 BBBCB 41-45 CDADB 46-50 BAACB51-55 BABAA 56-60 BBBDD 61-65 CABAD 66-70 DCADD 71-75 CACDB。
小学三年级错题集(1)(免费下载)
1、有99块巧克力，最少拿出（）块后可以平均分给7个小朋友，每人分（）块。
2、括号里最大能填几？6×（）＜333、在括号里填上适当的数：（）÷4=280÷（）=（）÷6=800÷（）4、在方框里块上适当的数：5、小朋友们在操场上围成圈做游戏，琳琳前面有9个小朋友，琳琳的后面也有9个小朋友，一共有_______个小朋友做游戏。
6、一个数加上8，再乘8，再减去8，再除以8，结果是9，这个数是（）7、要使□57÷7的商是两位数，□里可以填（）A．9 B．8 C．3 D．78、被除数去掉末尾的0就与除数相等，被除数与除数相差243，除数是_______9、在除数的末尾添上一个0就与被除数相等，除数比被除数小189，被除数是_______10、到广场放风筝的成人人数是儿童的2倍，如果一共有270人，那么儿童有多少人？成人有多少人？11、班长要将22块橡皮擦和33支铅笔平均分给参加打扫教室卫生的同学，结果橡皮擦多1块，铅笔少2支，参加打扫卫生的同学有多少人？12、学校合唱队中，女生人数是男生的6倍，如果合唱队一共有49人，男生有几人？14、玩具厂生产720把水枪，每袋装6把，可以装多少袋？每箱装4袋，可以装多少箱？15、某旅馆7人房间每间105元，5人房间每间90元，这两种房间哪种便宜？三（1）班有学生45人，他们该怎样住宿最便宜，且不浪费床位？16、有100位学生排成一个方阵，要使每行每列人数一样多，每行应该排多少人？17、买3个篮球和4个足球一共458元，买4个篮球和3个足球一共368元，买1个篮球和1个足球一共多少元？18、丁丁6天看了246页书，照这样的速度，看完这本书还需要2天。
这本书一共有多少页？19、喜糖铺里新进了一批水果糖，每箱有152粒，一共有6箱。
现在要重新包装成每袋8粒，这些糖一共可以包多少袋？1、有99块巧克力，最少拿出（）块后可以平均分给7个小朋友，每人分（）块。
错题集1-牛客
错题集1-⽜客⼀、下⾯哪⼀个不是JavaScript的数据类型？A.StringB.BooleanC.IntegerD.Undefined答案：C解题思路：JavaScript的数据类型分为两种：原始类型（即基本数据类型）和对象类型（即引⽤数据类型）：基本类型：String、Number、Boolean、Null、Undefined、Symbol引⽤类型：Object、Array、FunctionInteger是整⾏的意思⼆、HTML5 中不再⽀持下⾯哪个元素？A.<q>B.<ins>C.<menu>D.<font>答案：D解题思路：HTML废除的元素1、能⽤css代替的元素basefont、big、center、font、s、strike、tt、u。
这些元素纯粹是为画⾯展⽰服务的，HTML5中提倡把画⾯展⽰性功能放在css中统⼀编辑。
2、不再使⽤frame框架。
frameset、frame、noframes。
HTML5中不⽀持frame框架，只⽀持iframe框架，或者⽤服务器⽅创建的由多个页⾯组成的符合页⾯的形式，删除以上这三个标签。
3、只有部分浏览器⽀持的元素applet、bgsound、blink、marquee等标签三、下⾯代码输出结果：(function(){var a=b=5;})();console.log(b);console.log(a);A. 5,5B.undefined,undefinedC.5,undefinedD.5,Uncaught ReferenceError:a is not defined答案：D解析：var声明a，a就成为的局部变量。
根据垃圾回收机制，a在函数运⾏完就被销毁，console获取不到，报错。
b没有被声明，默认为全局变量，值为5。
四、A. 1,2,3,4B.0,1,2,3C.3,3,3,3D.4,4,4,4答案：D解析：事件（例如：click，focus等）、定时器（setTimeout和setInterval），ajax都是异步！！。
二年级上册语文错题集 (1)
二年级上册语文错题集1、写错的字：观琴棋错题原因分析：主要是因为没掌握牢和粗心出错的。
2、多音字：奔bēn（奔跑）bèn（奔向）分fēn（分辨）fèn（养分）错题原因分析：多音字第一个是因为把拼音搞反了，第二个是因为分不太会组词。
3、出错的拼音：晨（chén）樱桃（yīng)错题原因分析：分不清前后鼻音。
4、混淆的字：座（座位）——坐错题原因分析：座位的座和坐下的坐就是不太会使用。
5、选字填空：状、壮形( ) 奖( ) 强( ) ( )丽错题原因分析：分辨不清字的意思。
6、照样子，填词语：（拍）皮球（）青虫（）故事（）钢琴（）西瓜（）音乐汽车（）作业错题原因分析：学生不能正确使用动词。
7、错题：(无)谷（风）登春（华）秋（时）原因：学生没有根据词语意思去填写，随便填写了一个同音字。
8、错题：“区”共（5）画，第二画是（︱）“巨”共（6）画，第二画是（︱）原因：暑假上来学生对上学期的一些特殊笔画已遗忘，把它们全拆开了。
9、错题：（五颜六色）的云海（高大）的雄鸡原因：学生对事物的特点不够了解，所以在填写时摸棱两可。
10、错题：工（做）（做）文（做）业（作）事原因：平时遇到类似的词语时，没根据意思好好去记，一旦要求灵活运用就乱用。
11、错题：橡皮筋的弹（tán dàn）力很好。
子弹（tán dàn ）穿过了那件厚厚的防弹（tán dàn）衣。
原因：学生知道读什么音，可选时粗心，也有个别学生声调分不清。
12、错题：乐颠颠（快快乐）（高兴兴）（明白白）原因：学生只注意ABB形式，没有考虑这样的词存不存在。
13、错误：我的家乡是美丽的湖州。
湖州是我美丽的家乡。
李小青是我们班的劳动委员。
劳动委员是我们班的李小青。
原因：“是”字句改写时，没有考虑前后内容。
14、错题：灿烂（地）阳光兴奋（的）回家跑（地）快原因：对于“的”“地”“得”运用是一个难点，二年级学生还小，分不清词性，在加上刚接触，因此做错较多。
苏教版初一数学第二学期期中复习错题集(1)
2020－2021学年度第二学期初一数学期中复习错题集（1）一．选择题（共11小题）1．如果等式（2x﹣3）x+3＝1，则等式成立的x的值的个数为（）A．1B．2C．3D．42．如图，在五边形ABCDE中，∠A+∠B+∠E＝α，DP、CP分别平分∠EDC、∠BCD，则∠P的度数是（）A．α﹣90°B．90°C．D．540°3．如图，在△ABC中，AD、BE分别是BC、AC边上的高，AF、BG分别是△ABC中∠BAC，∠ABC的角平分线，∠C＝50°，给出如下四个结论：①∠3＝50°，②∠4＝115°，③∠1＝∠2，④，其中正确的结论是（）A．①②③④B．②③④C．①③④D．①②④4．如图，△ABC的三边长均为整数，且周长为22，AM是边BC上的中线，△ABM的周长比△ACM的周长大2，则BC长的可能值有（）个．A．4B．5C．6D．75．下列是一名同学做的6道练习题：①（﹣3）0＝1；②a3+a3＝a6；③（﹣a5）÷（﹣a3）＝﹣a2；④4m﹣2＝；⑤（xy2）3＝x3y6；⑥22+23＝25，其中做对的题有（）A．1道B．2道C．3道D．4道6．如图，∠ABC＝∠ACB，AD，BD，CD分别平分△ABC的外角∠EAC、内角∠ABC、外角∠ACF．以下结论：①AD∥BC；②∠ACB＝2∠ADB；③DB平分∠ADC；④∠ADC＝90°﹣∠ABD；⑤∠BDC＝∠BAC．其中正确的结论有（）A．1个B．2个C．3个D．4个7．设a，b是实数，定义@的一种运算如下：a@b＝（a+b）2﹣（a﹣b）2，则下列结论：①若a@b＝0，则a＝0或b＝0②a@（b+c）＝a@b+a@c③不存在实数a，b，满足a@b＝a2+5b2④设a，b是矩形的长和宽，若矩形的周长固定，则当a＝b时，a@b最大．其中正确的是（）A．②③④B．①③④C．①②④D．①②③8．如图（1）所示为长方形纸带，将纸带沿EF折叠成图；（2）再沿BF折叠成图；（3）继续沿EF折叠成图（4）按此操作，最后一次折叠后恰好完全盖住∠EFG，整个过程共折叠了9次，问图（1）中∠DEF的度数是（）A．20°B．19°C．18°D．15°9．如图，有一张边长为b的正方形纸板，在它的四角各剪去边长为a的正方形．然后将四周突出的部分折起，制成一个无盖的长方体纸盒．用M表示其底面积与侧面积的差，则M可因式分解为（）A．（b﹣6a）（b﹣2a）B．（b﹣3a）（b﹣2a）C．（b﹣5a）（b﹣a）D．（b﹣2a）210．如果一个正整数可以表示为两个连续奇数的平方差，那么称该正整数为“和谐数”如（8＝32﹣12，16＝52﹣32，即8，16均为“和谐数”），在不超过2017的正整数中，所有的“和谐数”之和为（）A．255054B．255064C．250554D．25502411．如图，将四边形纸片ABCD沿MN折叠，若∠1+∠2＝130°，则∠B+∠C＝（）A．115°B．130°C．135°D．150°二．填空题（共12小题）12．如图△ABC中，将边BC沿虚线翻折，若∠1+∠2＝102°，则∠A的度数是．13．若m、n为整数，且（x+m）（x+n）＝x2+ax+12，则a的取值有种情况．14．使等式（2x+3）x+2020＝1成立的x的值为．15．如图，已知AB∥CD，E是直线AB上方一点，G为直线AB下方一点，F为直线CD上一点，∠EAF＝148°，∠BAF＝3∠BAG，∠DCE＝3∠DCG，则∠E和∠G的数量关系为．16．如果三角形的两个内角α与β满足3α+β＝90°，那么我们称这样的三角形为“准直角三角形”．如图，B、C为直线l上两点，点A在直线l外，且∠ABC＝45°．若P是l上一点，且△ABP是“准直角三角形”，则∠APB的所有可能的度数为．17．如图是某公园里一处矩形风景欣赏区ABCD，长AB＝50米，宽BC＝30米，为方便游人观赏，公园特意修建了如图所示的小路（图中非阴影部分），小路的宽均为1米，那么小明沿着小路的中间出口A到出口B所走的路线（图中虚线）长为米．18．如图，在△ABC中，∠C＝90°，BC＝8cm，AC＝6cm，点E是BC的中点，动点P从A点出发，先以1cm/s的速度沿A→C运动，然后以2cm/s的速度沿C→B运动．若设点P运动的时间是t秒，那么当t＝时，△APE的面积等于6cm2．19．如果多项式6x2﹣kx﹣2因式分解后有一个因式为3x﹣2，则k＝．20．如图，已知在△ABC中，AD⊥BC，垂足为D，AB＝13，AC＝15，BD＝5，CD＝9，AD＝12．点P从点B出发沿线段BA﹣AC的方向，以1个单位/秒的速度运动到点C停止，当t＝秒时，△ADP与△BDP的面积相等．21．如图，在△ABC中，AD是中线，点E在AB上，且BE＝2AE，连接CE交AD于点O．连接BO，若△ABC的面积为1，则四边形BDOE的面积为．22．在△ABC中，AD是高，∠BAD＝60°，∠CAD＝20°，AE平分∠BAC，则∠EAD的度数为．23．如图，AD，CE是△ABC的两条高，它们相交于点P，已知∠BAC的度数为α，∠BCA 的度数为β，则∠APC的度数是．三．解答题（共14小题）24．如图1，已知线段AB、CD相交于点O，连接AC、BD，则我们把形如这样的图形称为“8字型”．（1）求证：∠A+∠C＝∠B+∠D；（2）如图2，若∠CAB和∠BDC的平分线AP和DP相交于点P，且与CD、AB分别相交于点M、N．①以线段AC为边的“8字型”有个，以点O为交点的“8字型”有个；②若∠B＝100°，∠C＝120°，求∠P的度数；③若角平分线中角的关系改为“∠CAP＝∠CAB，∠CDP＝∠CDB”，试探究∠P与∠B、∠C之间存在的数量关系，并证明理由．25．如图，A，B两点同时从原点O出发，点A以每秒a个单位长度沿x轴的负方向运动，点B以每秒b个单位长度沿y轴的正方向运动．（1）如图1，若|a+2b﹣5|+（2a﹣b）2＝0，试分别求出1秒钟后，A，B两点的坐标；（2）如图2，延长BA至E，在∠ABO的内部作射线BF交x轴于点C，若∠EAC，∠FCA，∠ABC的平分线交于点G，过点G作BE的垂线，垂足为H，试问∠AGH，∠BGC的大小关系如何？请写出你的结论并证明；（3）如图3，过A，O两点的直线相交于点N，AB的延长线交ON于点M，若∠MAN＝∠NOB，∠BAO﹣∠N＝m°，试求∠AMO的度数．26．已知如图，∠COD＝90°，直线AB与OC交于点B，与OD交于点A，射线OE与射线AF交于点G．（1）若OE平分∠BOA，AF平分∠BAD，∠OBA＝36°，则∠OGA＝°．（2）若∠GOA＝∠BOA，∠GAD＝∠BAD，∠OBA＝36°，则∠OGA＝°．（3）将（2）中的“∠OBA＝36°”改为“∠OBA＝α”，其它条件不变，求∠OGA的度数．（用含α的代数式表示）（4）若OE将∠BOA分成1：4两部分，∠GAD═∠BAD，∠ABO＝α（18°＜α＜90°），求∠OGA的度数．（用含α的代数式表示）27．如果a c＝b，那么我们规定（a，b）＝c，例如：因为23＝8，所以（2，8）＝3（1）根据上述规定，填空：（3，27）＝，（4，1）＝（2，0.25）＝；（2）记（3，5）＝a，（3，6）＝b，（3，30）＝c．求证：a+b＝c．28．已知AM∥CN，点B为平面内一点，AB⊥BC于B．（1）如图1，直接写出∠A和∠C之间的数量关系；（2）如图2，过点B作BD⊥AM于点D，求证：∠ABD＝∠C；（3）如图3，在（2）问的条件下，点E、F在DM上，连接BE、BF、CF，BF平分∠DBC，BE平分∠ABD，若∠FCB+∠NCF＝180°，∠BFC＝3∠DBE，求∠EBC的度数．29．在△ABC中，∠C＝90°，BD是△ABC的角平分线，P是射线AC上任意一点（不与A、D、C三点重合），过点P作PQ⊥AB，垂足为Q，交直线BD于E．（1）如图，当点P在线段AC上时，说明∠PDE＝∠PED．（2）作∠CPQ的角平分线交直线AB于点F，则PF与BD有怎样的位置关系？画出图形并说明理由．30．我国古代数学的许多发现都曾位居世界前列，其中“杨辉三角”就是一例．杨辉法则：如图，两侧的数都是1，其余每个数均为其上方左右两数之和，它给出了（a+b）n（n为正整数）的展开式（按a的次数由大到小的顺序排列）的系数规律．例如，第三行的三个数1、2、1，恰好对应（a+b）2＝a2+2ab+b2展开式中的系数；第四行的四个数1、3、3、1，恰好对应（a+b）3＝a3+3a2b+3ab2+b3展开式中的系数．（1）根据上面的规律，写出（a+b）5的展开式；（2）利用上面的规律计算：（﹣3）5+5×（﹣3）4+10×（﹣3）3+10×（﹣3）2+5×（﹣3）+1．31．先阅读下面的内容，再解决问题：问题：对于形如x2+2xa+a2，这样的二次三项式，可以用公式法将它分解成（x+a）2的形式．但对于二次三项式x2+2xa﹣3a2，就不能直接运用公式了．此时，我们可以在二次三项式x2+2xa﹣3a2中先加上一项a2，使它与x2+2xa的和成为一个完全平方式，再减去a2，整个式子的值不变，于是有：x2+2xa﹣3a2＝（x2+2xa+a2）﹣a2﹣3a2＝（x+a）2﹣4a2＝（x+a）2﹣4a2＝（x+a）2﹣（2a）2＝（x+3a）（x﹣a）像这样，先添一适当项，使式中出现完全平方式，再减去这个项，使整个式子的值不变的方法称为“配方法”．利用“配方法”，解决下列问题：（1）分解因式：a2﹣8a+15；（2）若a2+b2﹣14a﹣8b+65+|m﹣n|＝0①当a，b，m满足条件：2a×4b＝8m时，求m的值；②若△ABC的三边长是a，b，c，且c边的长为奇数，求△ABC的周长．32．如图，已知AM∥BN，点P是射线AM上一动点（与点A不重合），BC、BD分别平分∠ABP和∠PBN，分别交射线AM于点C，D，且∠CBD＝60°．（1）求∠A的度数；（2）当点P运动时，∠APB与∠ADB之间的数量关系是否随之发生变化？若不变化，请写出它们之间的关系，并说明理由；若变化，请写出变化规律．（3）当点P运动到使∠ACB＝∠ABD时，求∠ABC的度数．33．【生活常识】射到平面镜上的光线（入射光线）和变向后的光线（反射光线）与平面镜所夹的角相等．如图1，MN是平面镜，若入射光线AO与水平镜面夹角为∠1，反射光线OB与水平镜面夹角为∠2，则∠1＝∠2．【现象解释】如图2，有两块平面镜OM，ON，且OM⊥ON，入射光线AB经过两次反射，得到反射光线CD．已知：∠1＝55°，求∠4的度数．【尝试探究】如图3，有两块平面镜OM，ON，入射光线AB经过两次反射，得到反射光线CD，光线AB与CD相交于点E，若∠MON＝46°，求∠CEB的度数．【深入思考】如图4，有两块平面镜OM，ON，且∠MON＝α，入射光线AB经过两次反射，得到反射光线CD，光线AB与CD所在的直线相交于点E，∠BED＝β，α与β之间满足的等量关系是．（直接写出结果）34．如图，平面内，四条线段AB、BC、CD、DA首尾顺次相接，∠ABC＝20°，∠ADC＝40°．（1）如图1，∠BAD和∠BCD的角平分线交于点M，求∠AMC的大小；（2）如图2，点E在BA的延长线上，∠DAE的平分线和∠BCD的平分线交于点N，求∠ANC度数；（3）如图3，点E在BA的延长线上，点F在BC的延长线上，∠DAE的平分线和∠DCF 的平分线交于点P，请直接写出∠APC的度数．35．如图，已知l1∥l2，MN分别和直线l1、l2交于点A、B，ME分别和直线l1、l2交于点C、D，点P在MN上（P点与A、B、M三点不重合）．（1）如果点P在A、B两点之间运动时，∠α、∠β、∠γ之间有何数量关系请说明理由；（2）如果点P在A、B两点外侧运动时，∠α、∠β、∠γ有何数量关系（只须写出结论）．36．如图1，AB∥CD，点E，F分别在直线CD，AB上，∠BEC＝2∠BEF，过点A作AG ⊥BE的延长线交于点G，交CD于点N，AK平分∠BAG，交EF于点H，交BE于点M．（1）直接写出∠AHE，∠F AH，∠KEH之间的关系：＝+；（2）若∠BEF＝∠BAK，求∠AHE；（3）如图2，在（2）的条件下，将△KHE绕着点E以每秒5°的速度逆时针旋转，旋转时间为t，当KE边与射线ED重合时停止，则在旋转过程中，当△KHE的其中一边与△ENG的某一边平行时，直接写出此时t的值．37．在△ABC中，∠BAC＝90°，点D是BC上一点，将△ABD沿AD翻折后得到△AED，边AE交射线BC于点F．（友情提醒：翻折前后的两个三角形的对应边相等，对应角相等．）（1）如图①，当AE⊥BC时，求证：DE∥AC；（2）若∠C﹣∠B＝10°，∠BAD＝x°．①如图②，当DE⊥BC时，求x的值；②是否存在这样的x的值，使得△DEF中有两个角相等．若存在，并求x的值；若不存在，请说明理由．。
五年级数学上册错题集一
五年级上册错题集（一）1. 若小红向东走100米，记作—100，则小强向西走120米，记作（）2.如果乌龟0处先向东爬行4格，又向西爬行7格，这时乌龟的位置应记作（）米。
3.一栋大楼，地面以上有20层，地面以下有3层。
地面以上的楼层记作正数，大楼每层高3米。
（1）—2层表示什么意思？（2）坐电梯从+2层到—3层，电梯下降了多上米？4.如下图，用竹篱笆围成一个梯形养鸡场，场地的一边利用房屋的篱笆，篱笆的总长度是95米，这个养鸡场占地多少平方米？5.一块梯形菜地的上底长300米，下底长500米，高50米，这块菜地的面积是（）①4公顷②2公顷③4平方米6.一位足球守门员练习折返跑，从守门位置出发，向前跑记作正数，向后跑记作负数，它的练习记录如下：（单位：米）+7 —3 +11 —8 —5 +12 —10守门员离开守门位置最远是（）7.一个三位小数“四舍五入”后是8.20，这个数最小是（），最大是（）8.一个小数的千分位“五入”后是5.85，这个数精确到十分位是（）。
① 5.8 ②5.9 ③6.09.马小虎在读一个小数时，忘读小数点了，把这个小数读成了二十万零五十七。
如果这个小数只能读一个“零”，那么原来的小数是多少？如果可以读出两个“零”呢？10.判断题，一个减法算式中，被减数比减数多10.01，比差0.9，那么被减数是10.91.（）11.填上合适的单位，故宫的面积大约是72 （）12.把497500000改写成用“万”作单位的数是（），用“亿”作单位且保留一位小数约是（）13.把两根同样长的铁丝分别围成正方形和平行四边形，比较他们的面积（）①正方形的大②平行四边形的大③一样大④无法比较哪个大14.计算阴影部分面积15.在自行车40米慢骑比赛中，李萍骑了2.24分钟，王媛骑了2.15分钟，陈华骑了1.95分钟，赵颖骑了2.20分钟。
四人中谁是第一名？比第四名慢多少分钟？16.丽丽给妹妹3.55元钱后，妹妹还比她少0.35元。
小学六年级数学上册十一月易错题集1
六年级数学十一月错题集（一）1．推导圆的周长公式时，我们是用（）的方法得出计算公式C＝πd或C＝2πr。
A．画圆为方B．化曲为直C．化直为曲D．没有方法2．车轮滚动一周时，走过的路程是车轮的（）A．半径B．直径C．周长D．面积3．把一个半径是2厘米的圆平均分成两个半圆后，每个半圆的周长是（）厘米。
A．2.56B．6.28C．10.28D．8.284．车轮转动一周行驶的路程是车轮的（）A．直径B．周长C．面积5．如图所示圆环，内圆直径是5m，环宽2m，外圆与内圆的周长相差（）m。
A．9πB．4.5πC．4πD．2π6．一个圆的周长是2πr，那么与它同半径的半圆的周长是（）A．πr B．πr+r C．（π+2）r D．（πr+r）÷2 7．如图，小红和小明分别从A，B处出发，沿半圆走到D，C处，小红比小明多走（）m。
A．50.24B．25.12C．12.56D．6.288．在一个半径4cm的圆里，画了如图4个小圆，这些小圆的周长总和是（）A．6.28cm B．12.56cm C．25.12cm D．不确定9．两个圆的半径分别是3dm，4dm，这两个圆的周长比是（）A．9：16B．3：4C．16：9D．4：310．一个直径1厘米的圆，在下面的直线上从“0”开始滚动，一周后圆的位置大约在（）（下面每格代表一厘米）A．B．C．D．11．两个圆的周长不同，是因为它们的（）不同A．圆心的位置B．圆的直径C．圆周率12．一个圆的半径扩大3倍，那么这个圆的周长就扩大（）A．6倍B．3倍C．9倍D．3π倍13．如图中，三个圆的圆心在同一条直线上，大圆的周长和两个小圆的周长之和比较，结果是（）A．大圆的周长长B．小圆的周长和长C．两者相等D．无法判断14．在一个正方形中画一个最大的圆（如图），已知圆的周长是62.8厘米，则正方形的面积是平方厘米。
15．一个直径是3cm的圆，它的周长是cm。
答案1．B。
2．C。
小学数学：四下错题集1
（四下）第一单元一、填空1、姐姐的年龄是a岁，晓华的年龄是b岁。
再过x年后，姐姐比晓华大（）岁。
2、甲组有x人，比乙组多6人，则乙组有（）人。
3、科幻书每本a元，童话书每本b元，王芳同学买了6本科幻书和7本童话书，需要付（）元。
4、a的2倍与b的一半的和用式子表示（）。
二、解方程（1）X ÷ 8=2.5 （2）x-0.6x=48三、解决问题1、果园里有枣树比柿子树多60棵，枣树是柿子树的4倍，枣树和柿子树各有多少棵？2、两座大楼相距300米，甲乙俩人同时分别从两楼门口背向行走，7分钟后俩人相距860米。
甲每分钟走37米，乙每分钟走多少米？3、小明看一本故事书，看了60页，剩下的页数是看了的2倍。
这本故事书有多少页？（四下）第三单元一、填空1、a、b是自然数，a÷b=5,所以（）是（）的因数。
2、三个连续奇数的和是45，这三个奇数分别是（）、（）、（）。
3、20以内，最小的质数与最大合数的和是（），积是（）。
4、在非0的自然数中，最小的质数是（），最小的合数是（），最大的两位数偶数是（），最小的三位数奇数是（）。
5、两个连续的非零自然数，他们都是质数，这两个数分别是（）和（）。
6、用0、2、3、4中的三个数组成一个同时是2、3、5倍数的最大三位数是（）。
7、将44分解质因数是（）。
(1)因数21=3×7，所以3和7都是21的（）。
8、在括号里填上适当的质数。
30=（）-（）21=（）+（）二、选择题1、甲数×11=乙数，乙数是甲数的（）A倍数B因数C自然数2、任何奇数加上奇数后（）。
A一定是2的倍数B不是2的倍数C无法判断三、解决问题1、一个长方形周长是24米，它的长和宽的米数恰好是两个质数，这个长方形的面积是多少平方米？2、30个同学进行体操表演，若要求每队人数相同，可以怎样排队？（列出算式）（提示：说明每队几人，排几队。
）。
人教版必修一高中化学高一上学期化学错题集1(10.09).docx
高中化学学习材料唐玲出品高一化学错题集1班级姓名1．下列各组物质中，前一种是化合物，后一种是混合物的是（）A．氧化钙，洁净的雨水B．氢氧化钾，含铜80％的氧化铜C．澄清的石灰水，粗盐D．红磷，空气答案：A解析：洁净的雨水也是混合物，含铜80％的氧化铜即纯净的氧化铜，澄清石灰水是混合物。
2．Na2CO3俗名纯碱，下面是对纯碱采用不同分类法的分类，不正确的是（）A．Na2CO3是碱B．Na2CO3是盐C．Na2CO3是钠盐 D．Na2CO3是碳酸盐答案：A解析：纯碱不是碱3．经分析，某物质只含有一种元素，则此物质（）A．一定是一种单质 B．一定是纯净物C．一定是混合物 D．可能是纯净物，也可能是混合物答案：D解析：氧气和臭氧混合气体只含一种元素，是混合物。
4．物质分类是化学研究的重要方法之一。
化学工作者经常根据物质的组成对物质进行分类研究。
近年来发现，在金星大气层中存在三氧化二碳。
下列物质与它属于同类的是（）A．H2、O3B．H2SO4、H2CO3C．SO2、NO D．Na2SO3、KClO3答案：C解析：三氧化二碳属于非金属氧化物。
5．以Fe、CuO 、CuCl2溶液、盐酸、氢氧化钾溶液为反应物，两两间可发生的反应有（）A．6个B．5个C．4个D．3个答案：A解析：Fe和CuO 、CuCl2溶液、盐酸都可反应，CuO与盐酸反应， CuCl2溶液和氢氧化钾反应，盐酸与氢氧化钾反应。
人教版七年级英语下册专题训练18：错题集(含答案)1
七下期末错题集（含答案）1.When the girl saw a big dog,she shouted ______ her father ______ help.A.at;withB.to ;forC.at;forD.to;with2.I saw Jim _______ near the river on my way home.A.playsB.playingC.to playD.played3.I can’t speak Russian very well.It’s _______ difficult for me.A.a kind ofB.a littleC.a little ofD.kinds of4.Each of them _______ some fruit for free.A.getB.getsC.gettingD.to get5.Lucy is _______ girl.A.a quite beautifulB.quite a beautifulC.quite beautiful aD.beautiful quite a6.Mike, I feel something _______ on my head.—Well ,let me have a look.A.to be movedB.movedC.movingD.to move7.What______ he ______like?—He’s thin and tall.A.is;lookB.does;looksC.does;lookD.is;looks8.Some chicken______in the bowl,and some______ are in the garden.A.is;chickenB.are;chickenC.is;chickensD.are;chickens9._______interesting job this is!A.WhatB.HowC.What anD.How an10.I saw her_______ just now.A.to playB.playingC.playsD.play11.I told the visitors______them and their ______habits.A.to;lifeB.about;livingC.of;lifeD.to;living12.I was so scared that I couldn’t move.(同义句)I was _____ scared ______ move.13.The man _____ thick glasses is my teacher.A.byB.onC.withD.in14.It’s time to get up!Please ask them to stop_______.A.to sleepB.sleepingC.sleepsD.sleep15.I’d like to drink_________.A.some orangesB.orangesC.some orangeD.orange juices16.These _______(music) all come from Australia.17.There is a beautiful garden _____Fifth Street.A.onB.inC.withD.at18.Just ______straight and turn right.A.goingB.goC. to goD.goes19.—Mike ,______play with your eraser in class.—I’m sorry.A.don’tB.doesn’tC.can’tD.not20.There are a lot of small gardens in our community.(同义句)There are _______ _______ small gardens in our community.21.She is talking with friends _____ wechat.A.forB.inC.onD.at22.Please _____ quiet! The students _______ reading books.A.is;areB.be; areC.is;beD.be;be23.—Hello, may I speak to Mary ,please?— _______.A.I don’t think soB.I am MaryC.Hurry up,pleaseD.This is Mary speaking24.—Can I have ______ tea?—Sorry, there isn’t ______.A.some;anyB.an;someC.any;someD.a;some25.Some students are doing their homework,_______ are talking.A.othersB.the othersC.otherD.the other26.She is over 40 years old.(同义句)She is _____ _____ 40 years old.27.He is from China.(同义句)He _____ ______ China.28.It take s me 2 hours ______ (finish)my homework.29.You must do the dishes after ______(eat)dinner.30.Don’t ______(talk) in class.31.He often practices_______(play) the piano.32.Can you ______ English?—No, I can ______it in Chinese.A.speak;speakB.speak;sayC.say;sayD.talk;say33.Ice-creams ______ good, so all the children like ______.A.tastes;itB.taste;themC.tastes;themD.taste;it34.He b______ his teeth every day.35.She likes ________(锻炼)after dinner.36.The children went to the mountains _______ Friday afternoon.A.atB.forC.onD.in37.My grandparents like living in the c________(乡村).38.On my birthday I got lots of_______(礼物) from my friends.39.These b______(幼小的) pandas can’t eat much.40.I have much work to do.I’m ________ busy.A.a bit ofB.a littleC.a lotD.a few41.I had a good time in Beihai Park last Sunday.(同义句)I ________ ________ in Beihai Park last night.42.When he saw the tiger for the first time,he got a ________.A.surprisedB.surprisingC.surpriseD.surprises43.We need you _______ help______ our school trip.A./;forB.to;forC./;withD.to;with45.I go to ______ work after _______ breakfast everyday.A./;theB./;/C.the;aD.the;the46.Our teacher shows_________?A.me itB.me to a mapC.a map to meD.a map me47.Your brother is good _______ telling stories, so he can be good ______ children?A.for;withB.at;withC.to;atD.at;for48.What _______ you ________ when it is rainy?A.are;doB.is;doC.do;doD.does;do49.-May I use your telephone?-Sorry.It ________.A.isn’t worksB.worksC.doesn’t workD.isn’t work50.What a nice _______ it is!I want to go out for a walk.A.weatherB.photoC.dayD.today51.They are playing games;they are very ________(relax).52.I don’t know Bill,_______ I can’t tell you anything about him.A.becauseB.butC.soD.or53.I can help you with _______(sing).54.-Who visited the farm last Sunday?-_________.A.The boy visitedB.He doesC.His father wasD.He did55.The driver is sitting ______ the car.A.in front ofB.in the frontC.in frontD.in the front of56.Alice spends too much time ________ computer games.A.playB.playsC.to playD.playing57.Mike is a student from _______,and he studies very_______.A.Russian;wellB.Russia;goodC.Russia;hardD.Russian;hard58.He sees a boy _______baseball with his friends now.A.playB.to playC.playingD. plays59.-Who is in your classroom now?-________.All the students are on the playground.A.SomebodyB.AnybodyC.NobodyD.Everybody60.Do you think everyone ________ their weekends?A.enjoysB.enjoyC.enjoyingD.to enjoy61.She’s just 25,but she has _______ white hairs.A.a fewB.muchC.lot ofD.a little62.Look at the ______!It’s ________ heavily now.A.rain;rainB.raining;rainingC.raining;rainyD.rain;raining63.My phone isn’t________(work).64.Little Tom can draw ________.His drawings are very ________.A.good,wellB.well,goodC.good,goodD.well,well65.---- ________ do you join the club?----BecauseI like music.A.WhatB.WhereC.WhyD.How66.We have lots of fun ________ games.A.playB.to playC.playingD.plays67.The train ________ the train station at 8:40 every morning.A.crossesB.runsC.leaveses68.For some students ,it’s difficult________school.A.to get toB.get toC.to getD.get69.----Is she your sister?----________.she is my aunt.A.Yes,she isn’t.B.No,she is.C.Yes,she is.D. No,she isn’t.70.----Do you like ________ ?----Yes,they’re very smart.A.elephantB.tigerC.pandasD.animal71.My little cat sleeps ________the day,but ________ night he begins to work.A.at,atB.on,inC.on,atD.during,at72.Wait a minute.I have _____ to tell you.A.important somethingB.something importantC.nothing interestingD.anything new73.-Where _____ you last week?-I _____ in Xi’an.A.are ;amB.was;wasC.were;wasD.were;were74.Nick ____ to work on Sundays.He plays sports with his friends.A.goB.goesC.don’tD.doesn’t go75.-___ does Gina _____ her English teacher?-She likes her very much.A.How ;thinkB.What;likeC.How;think ofD.What ;think of76.The train station is not far ______ my home.A.toB.fromC.andD.with77.Sally _____ her mother.A.likeB.is likesC.likingD.is like78.Don’t eat in class _____ don’t fight in school.A.orB.butC.andD.so79.He often goes to work ____ his car.A.byB.inC.atD.with80.John is _____.He is _______ boy.A.8 years old;a 8-year-oldB. 8 years old; an 8-year-oldC. 8 years old; an 8 years oldD. 8-year-old; an 8-year-old81.-How far is your teacher’s home from here?-It’s about two _____ drive.A.hour’sB.hoursC.hours’D.hour82.The teacher is very stric _____ his students.A.withB.inC.forD.to83.You must learn ______.A.relaxB.relaxsC.to relaxD.relaxing84.There are ____ of students in our school but only _____ of them are girls.A.hundreds;two hundredB. hundred; two hundredC. hundreds;two hundredsD. hundred; two hundred85.The post office is near here. You can go there ____ foot.You don’t need to go there ___ bike.A.on;byB.on;onC.by;rideD.on;by86.-_____?-Yes,it is.A.Do you like this movieB.Is your sister at homeC.Is that your uncleD.Does your cousin reading.参考答案：1-5BBBBB 6-10CCCCB 11B 12too;to 13-15CBC 16musicians 17-19ABA 20 lots of 21-25CBDAB 26more than 27comes from 28to finish 29eating 30talk 31playing 32-33BB 34brushes 35 exercising 36 C 37countriside 38gifts 39 baby 40B41enjoyed myself /had fun 42-47CBBAB 48-50CCC 51relaxed 52C 53 singing 54-58 DDDCC 59-62CAAD 63working 64B 65C 66-70CCADC 71-75DBCDD 76-80BDCBB 81-86CACAAC。