高考英语易错题集
高中英语易错题集
1. (1) Mr. Smith did all he could ______ his family’s living standard.
(2) Mr. Wang made up his mind to devote all he could _____ his oral English before going abroad.
(3) He couldn’t believe that such a little boy could _____ his English with so little time.
A. improve
B. to improve
C. improving
D. to improving
2. (1) He was very careless, so I am afraid he _____ your umbrella by mistake yesterday.
(2) Everything he _____away from him before he returned to his hometown.
(3) Everything ______ away from him before he returned to his hometown.
A. took
B. had been taken
C. had had been taken
D. had taken
3. (1) Before he went abroad, he looked forward ______ English as much as possible.
(2) Before he went abroad, he spent as much time as he ______ English.
(3) As their English teacher had gone back to America, so as a result, they stayed only ____French.
A. could learning
B. to learn
C. to learning
D. could learn
4. (1) --- Why didn’t you put your cell phone in our overcoa t pocket?
--- I _______, but I was afraid it would be stolen.
A. had put
B. put
C. would have
D. could have
(2) --- _______ Mr. Brown _______ this week? --- No. he is on holiday.
A. Has; worked
B. Does; work
C. Did; work
D. Is; working
5. (1) The person we spoke to _______ no answer at first.
(2) The person was made _____ a speech at the meeting.
A. making
B. makes
C. to make
D. made
6. (1) He seemed _____ everything, but in fact he knew nothing.
A. to know
B. to have known
C. to knowing
D. knowing
(2) The person we referred to ______ us a report tomorrow.
A. giving
B. have given
C. gave
D. will give
7. (1) The days we have been looking forward to ______ soon.
(2) They have been looking forward to _____ to China soon.
(3) These days we have been looking forward to _______ to visit you.
A. coming
B. will come
C. came
D. have come
8. (1) Are you talking about _____ the new school next week?
(2) The person we talked about _______ our school last week.
A. visiting
B. will visit
C. visited
D. has visited
9. (1) The man is fond of _____ the most popular songs in our city.
(2) The man whose songs we are fond of ______ in our city next week.
A. singing
B. to sing
C. will sing
D. sang
10. (1) Not only_____ the jewelry she ____ been sold for her son’s gambling debts but also her house.
(2) Never _____ he come unless he _____ his wallet back.
A. will, has
B. has, had
C. has, has
D. /, has
11. (1) _____ in thought, he almost ran into the car in front of him.
(2) _____ his lovely dog, he looked for it everywhere.
(3) _____ his dog, he took it in the scary bushes.
A. Losing
B. Having lost
C. Lost
D. To lose
12. (1) You’d better _____ the small child across th e street.
(2) It’s better _____ the small child across the street.
A. to guide
B. guide
C. to guiding
D. to be guided
13. (1) --- What do you think made the woman so upset? --- ____ weight.
(2) --- What can I do to join in the league? --- _____ weight.
A. As she put on
B. Put on
C. Putting on
D. Because of putting on
(3) --- Why are the students so diligent these days? --- _______ the entrance exams.
A. Pass
B. To pass
C. Passing
D. Having passed
14. (1) How long is it ______ we last spent the holiday in the country together?
(2) Will it be long ______ we spend the holiday in the country together?
A. before
B. until
C. since
D. that
15. (1) It was only with the help of the local guide ____.
(2) It was snowing heavily _____.
(3) Only with the help of the local guide _______.
A. was the mountain climber rescued
B. then the mountain climber was rescued
C. when the mountain climber was rescued
D. that the mountain climber was rescued
16. (1) Never _____ time ______come again.
(2) Never _____ he _____ a single sheep.
A. has … lost
B. will … lose
C. will … lost
D. can… lose
17. (1) -- ______ was it ____ they discovered the entrance to the underground palace?
-- Totally by chance.
(2) --- _____ was it _____ they discovered at the entrance to the underground palace?
--- A helmet.
A. What, that
B. How, that
C. When, how
D. Where, that
18. (1) --- It so kind of you to give us so much help. --- ______.
(2) ---Could you be so kind as to give us a little bit of help? --- ______.
A. A pleasure
B. My pleasure
C. With pleasure
D. Why not
19. (1) --- ______ you didn’t speak to him all that day?
--- Of course. He was so impolite.
(2) I am sorry to trouble you, ______ can I have your name?
(3) Do something good to others, ______ you will get more back later.
(4) Be quiet, ______ you will not stay here any longer.
A. so
B. and
C. but
D. or
20. (1) ______ that he can always make himself understood.
(2) ______, he still cannot make himself understood.
A. So clearly he speaks English
B. So clearly does he speak English
C. Clearly as he speaks English
D. As he speaks English clearly
21. (1) He never said that he was good at mathematics, ______?
(2) He was unhappy at school today, _______?
A. was he
B. wasn’t he
C. did he
D. didn’t he
(3) Tom dislikes playing tennis, ______?
A. does he
B. doesn’t he
C. did he
D. didn’t he
22. (1) It was ______ the old clock that the old man spent the whole morning at home.
(2) It was three hours that the old man spent _____ the old clock.
A. repair
B. repairing
C. to repair
D. in repair
23. (1) Is this hotel _____ you said we were to stay in your letter?
(2) Is this the hotel _____ you said we were to stay in your letter?
A. that
B. where
C. the one
D. in which
24. (1) Fran is an honest girl, I say it, ______ I don’t like her.
(2) Fran is an honest girl; I say it, ______, I don’t like her.
A. even though
B. as though
C. even so
D. as long as
25. (1) A fast-food restaurant is the place, ____, just as the name suggests, eating is performed quickly.
(2) A fast-food restaurant is the place, _______ you can eat quickly.
(3) A fast-food restaurant is the place, _______ can perform you food quickly.
A. which
B. where
C. there
D.what
26. (1) Doctor Godwin says that _____ what forceful arguments against cigarette there are, many
people insist on smoking.
(2) Doctor Godwin says that _____ forceful arguments against cigarette there are, many people
insist on smoking.
(3) Doctor Godwin says that ___ forceful the arguments against cigarette are, many people insist on smoking.
(4)Doctor Godwin says that _____ happens, many people insist on smoking.
A. whatever
B. no matter
C. however
D. even if
27. (1) ______ China’s reform and opening up in late 1978, its quick development has aroused
worldwide attention.
(2) ______ China’s reform-opening-policy works, its quick development arouses worldwide
attention.
A. While
B. As
C. Since
D. With
28. (1) -- Where do you think _______ he _______ the computer? -- Sorry, I have no idea.
(2) -- Where on earth _______ he _______ the computer? -- Sorry, I have no idea.
A. had, bought
B. has, bought
C. did, buy
D. /, bought
29. (1) We should do more such exercises in the future, I think, _____ those we did yesterday.
(2) We should do such exercises in the future, I think, _____ we did yesterday.
(3) The teacher suggested that we should do _____ what he did yesterday.
(4) The teacher suggested that we should do _____ he did yesterday.
A. as
B. like
C. about
D. than
30. (1) He will tell you _______ he expects will win such a match.
(2) He will tell you _______ of the teams he expects will win such a match.
A. why
B. whom
C. which
D. who
31. (1) In New Zealand, I made lots of friends __ a very practical knowledge of the English language.
(2) When he came back from work, he found nothing left — only _____ a cup of milk.
A. get
B. to get
C. getting
D. got
(3) He got home, only ___ the house broken into.
A.to find
B.finding
C.found
D.find
(4) He kept working hard, only ____ to have a coffee.
A.to stop
B.stopping
C.stopped
D.stop
(5) Many universities have expanded, thus____ many people more the chance of higher education.
A. to allow
B.allowed
C.allowing
D.allow
32. (1) --- Was it there ______ you were away to see your friend off?
--- I’m not sure. But when I got back, it was gone.
(2) --- Was it there ______ you put your bike to see your friend off?
--- I’m not sure. But when I got back, it was gone.
A. that
B. which
C. while
D. where
33. (1) Scientists generally agree that Earth’s climate will warm up over the next 50 to 100 years
______ it has warmed in the 20,000 years since Ice Age.
(2) Scientists generally agree that the Earth will exist _____it has done in the past.
A. as long as
B. as much as
C. so long as
D. as well as
34. (1) We must stop pollution ______ longer.
(2) We must keep the fishes in the river _____ longer.
A. living
B. from living
C. to live
D. live
35. (1) --- Excuse me. Did you notice whether the No. 108 bus had gone by?
--- Not ______ I’ve been standing here.
(2) --- Excuse me. Did you notice whether the No 108 bus had gone by?
--- Not ______ I began to stand here.
(3)_____ a car reaches the end of its life, it is taken apart and any part that can be reused is sold off.
(4) He never thought that his success came ______ he least wanted it.
A. U(u)ntil
B. O(o)nce
C. S(s)ince
D. W(w)hile
36. (1) Not far from the club there was a garden, _____owner seated in it playing bridge with his children every afternoon.
(2) Not far from the club there was a garden, ____ owner was seated in it playing bridge with his children every afternoon.
(3)Harry Porter, _____ owner’s real name is J. K. Rowling, gave the world a block storm.
A. whose
B. its
C. which
D. that
37. (1) Wang Lin was elected _____ all he is the tallest.
(2) To tell the truth, Wang Lin was elected, _____ he is the tallest.
A. because
B. because of
C. for
D. as
38. (1) This is an illness that can result in total blindness ______ left untreated.
(2) ____you want me to fire you, I suggest you stop wearing sports clothes at office.
(3) You must keep on working in the evening ______ you are sure you can finish the task in time.
A. since
B. if
C. unless
D. until
39. (1) ____ sometimes keeps her awake at night ______ Tom is getting more and more quiet at home.
(2) ____ sometimes keeps her awake at night is _____ Tom is getting more and more quiet at home.
A. That; which
B. It; that
C. Whether; what
D. What; that
40. (1) I can think of many cases ______ students obviously knew a lot of English words and expressions but couldn’t write a good essay.
(2) This is the first case ___ he has won.
(3)Young people who have got jobs may realize university lessons can’t be the only preparation for all of the situations ________ appear in the working world.
(4) He’s got himself into a dangerous situation _____ he is likely to lose control over the plane.
(5) After graduation she reached a point in her career ______ she heeded to decision what to do.
(6) This is one point ____ everyone is in favour of .
A. why
B. that
C. what
D. where
41. (1) --- What should I do with this passage? --- ______ the main idea of each paragraph.
(2) --- What made him so worried? --- ______ the main idea of each paragraph.
(3) --- Why is he reading the passage in such a loud voice?
--- ______ the main idea of each paragraph.
A. Finding out
B. Found out
C. Find out
D. To find out
42. (1) --- I’ve looked everywhere, but I haven’t found any black ink.
--- Then, I’m afraid there is ______ left.
(2) --- Have you got anything interesting to tell us?
--- ______.
A. no one
B. none
C. neither
D. nothing
43. (1)---- How long have you been here?
---- _______ the end of last month.
(2) -- --When did you come here?
----- _______ the end of last month, I think.
(3) --- When shall we finish the project?
--- _______ the end of this month, I think.
A. In
B. By
C. At
D. Since
44. (1) You should treat him in the way ______ suits him most.
(2) Please share the way with us _____ you study English.
A. that
B. in which
C. how
D. why
45. (1) It was some time later ______ we realized the truth.
(2) It was some time ______ we realized the truth.
A. until
B. since
C. before
D. that
46. (1) ____ nice, the food was all eaten up soon.
(2) ____ nice, the food should be made by adding more sugar.
A. Tasting
B. Taste
C. Tasted
D. To taste
47. (1) ---You haven’t been to Beijing, have you?
---______. And how I wish to go there again.
(2) --- You haven’t been to Beijing, have you?
--- ______. But how I wish to go there.
A. Yes, I have.
B. Yes, I haven’t
C. No, I have
D. No, I haven’t
48. (1) He was sentenced to death _______ what he has stolen from the bank.
(2) They were forced to leave their homeland _____ the Nazis got there and killed many people.
A. that
B. since
C. because
D. because of
49. (1) You are saying that everyone should be equal, and this is _______ I disagree.
(2) You are saying that everyone should be equal, and this is ______ I disagree with.
A.why
B.where
C.what
D.how
50.(1) ---What should I wear to attend his wedding party?
---Dress ____ you like.
(2) ---What should I wear to attend his wedding party?
----Wear ____ you like.
A.what
B.however
C.whatever
D.how
51.(1) Nobody believed his reason for being absent from the class____ he had to meet his uncle at the airport.
(2) Nobody believed his reason _____ he was absent from the class.
A.why
B.that
C.where
D.because
高中英语易错题集
1. BDA
2. ACB
3. CAB
4. CD
5. DC
6. BD
7. BAA
8. AC
9. AC 10. CA 11. CBD 12.BA 13. CBB 14. CA 15. DCA 16. CA
17. BA 18. AB /C 19. ACBD 20. BC 21. CBB 22. BB 23. B/BD 24. AC
25. BBA 26. BACA 27. CB 28. DC 29. DAB/AB 30. DC 31. BCABC 32. CA 33. BA 34. CA 35. DCBA 36. BAA 37. BC 38. BCC 39. BD 40. DBBDDB
41. CAD 42. BD 43. DCB 44. A/AB 45.DC 46. AD 47. AD 48. DC 49.BC 50.BC 51.BA
初中英语50道易错题
初中英语50道易错题 考试时不要陷入这些易错题的陷阱！ 1. ——We'll do what we can English well this term. ——It?s high time for you to work hard. A. study B. to study C. be studied D. be studying 解析：这题可能会误选A，因为大家知道情态动词后接动词原形，但是请大家分析下句子的成分，这里的what we can 实际省略了do，这个what we can do 在句子中作宾语从句。正确答案是B，用动词不定式作目的状语。 2. ——I don't think your team can beat theirs. ——. But we could if Lin Tao were on the team. A. No, we can?t B. Yes, we can?t C. Yes, we can D. No, we can 解析：在think，believe这类词接的宾语从句，否定要提前。而对于否定句的回答，与习惯相反，yes是“不”no 是“是的”B,D
结构不正确，首先要排除。而我们看后面的BUT，表示转折，说明回答者的队没有打赢。那么就是we can't. 正确答案是A。翻译为“是的，我们没有赢”。 3. ——Have you finished your work yet？ ——No, not yet. I think it'll take ten minutes. A. another B. other C. others D. more 解析：another +数词+名词固定用法，another表示“另外的，再”根据题目意思，可以判断是需要再花10分钟，所以答案是A。 4. Roy made several kites, but of them can fly high in the sky. A. neither B. none C. all D. most 解析：neither "两者中任何一个都不" all "三者或三者以上都" most"大部分" 根据题目意思，只有none表示三个或三个以上“一
高三英语错题集精选(附答案)
高三英语易错题 1.Don’t worry, dear. I’ll soon have the car ______ again. A. going B. to go C. gone D. goes 2. ----Hello, is Jane at home? ----No, she is out. May I take a message? ----Yes. _______. A. Thank you B. Tell her Jack called C. Tell her Jack is calling D. It’s Jack calling 3. What shall we do when we _______ our experiment? A. finished B. have finished C. finishing D. had finished 4. Answer the question _________ so that all the class may hear you. A. in an enough loud voice B. in a loud enough voice C. in a voice enough loud D. in a voice loud enough 5. ________ the fish ______ good enough? A. Is; tasting B. Is; tasted C. Does; tasted D. Does; taste 6. _______ this word, can you tell me? A. How to pronounce B. How pronouncing C. How you pronounce D. How do you pronounce
九年级化学常见易错题汇总含答案
九年级化学一二章常见易错题 1、下列用量不正确的是 A、没有说明用量，液体取2mL—4mL B、酒精灯的酒精不超过容积的2/3 C、加热时，液体不超过试管的1/3 D、洗涤试管时，注入半试管水 2、下列物质中属于纯净物的是 A、洁净的食盐水 B、冰水混合物 C、净化后的空气 D、高锰酸钾完全分解后的剩余物 3、不能说明分子间有间隔的是 A、物质的热胀冷缩现象 B、食盐溶解在水中 C、食盐和蔗糖混合均匀 D、等质量的氧气和液氧，氧气体积比液氧大 4、决定元素种类的依据是 A、质子数 B、中子数 C、核外电子数 D、原子的相对原子质量 5、下列物质属于纯净物的是 2、3、4、 6、7，属于单质的是 4、7，属于 化合物的是 2、 3 、6 ，属于混合物的是1、5、8。
①洁净的空气②二氧化碳③高锰酸钾④铜⑤自来水 ⑥硫燃烧后的生成物⑦液氧⑧电解水后的生成物 6、某原子的质子数为26，中子数比质子数多4，则该原子中粒子总数为82 。 7、已知铁、铜、锌的相对原子质量为56、64、65，现有相同质量的1g铁、 铜、锌，其中含有原子数从多到少的顺序是铁、铜、锌。 8、日常生活中，与肥皂水作用容易起泡沫的是 A、珠江水 B、矿泉水 C、煮沸的水 D、含较多可溶性钙、镁化合物的水 9、27克铝箔在充足的氧气中完全燃烧，燃烧后的生成物的总质量是 A、约等于27克 B、一定小于27克 C、一定大于27克 D、一定等于27克 10、分子、原子、离子、质子、中子、电子都是我们学习过的粒子，试回答： （1）水是由水分子聚集而成的；（2）氧分子是由氧原子结合而成的； （3）铁是由铁原子结合而成的；（4）氢原子的原子核是由一个质子构成的。
中学英语易错题集锦大全211道题
中学英语易错集锦大全211道题(精华珍藏版) 1.Because he was ill yesterday, so he didn’t go to work. (×) Because he was ill yesterday, he didn’t go to work. (√) He was ill yesterday, so he didn’t go to work. (√) [析] 用though, but表示“虽然……，但是……”或用because, so 表示“因为……，所以……”时，though和but 及because和so 都只能择一而用，不能两者同时使用。 2.The Smiths have moved Beijing. (×) The Smiths have moved to Beijing. (√) [析] 不及物动词后接名词或代词作宾语时，要在动词之后加上适当的介词；但不及物动词 后接home, here, there等副词作宾语时，动词之后不必加任何介词。 3.The box is too heavy for him to carry it. (×) The box is too heavy for him to carry. (√) [析] the box既是这句话的主语, 也是不定式to carry的逻辑宾语，若句末再加上it，就和the box重复了。 4.Each of the boys have a pen. (×) Each of the boys has a pen. (√) [析] 复数名词前有表个体的each of, one of, every，either of等词组修饰，或有表否定的neither of, none of 等词组修饰时，谓语动词要用单数形式。 5.例:那是你心软！我不就是一个例子吗？ Neither he nor you is good at English. (×) Neither he nor you are good at English. (√) [析] either... or..., neither... nor..., not only..., but also... 等词组连接句子的两个主语时，
二次根式易错题集知识讲解
二次根式易错题集 一、二次根式的概念： 二次根式的性质： 1.()0≥a a 是一个非负数。 2.()02≥=a a a 3.()()???-≥==002 a a a a a a 错题： 1.=25 5 2.()=-23 －（－3）=3 3.()=--2 1255－1=4 4.() =2 63()5469632 2 =?=?或()=2 63()()5454632 2 2 ==? 5.() =-- 2 666-=-- 6.= -2 5 5151512 2=?? ? ??= 7.根据条件，请你解答下列问题：（1）已知n -20是整数，求自然数n 的值； 解：首先二次根式有意义，则满足,020≥-n 所以,20≤n 又因为n -20是整数，所以根号内的数一定是一个平方数，即n -20必定可化为()0,202≥=-a a a n 且为整数这种形式，即 ()0,202≥=-a a a n 且为整数。所以满足条件的平方数2a 有0，1，4，9，16。所以.4,11,16,19,20=n （2）已知n 20是整数，求正整数n 的最小值 解：因为n 20是整数，所以根号内的数一定是一个平方数，即n 20必定可化为()为整数a a n 220=这种形式，即()为整数a a n 220=，而()为整数a a n 25420??=，4可以开平方，剩下不能开平方的数5，所以正整数n 的最小值就是5，因2555=?能被开平方。所以我们要把常数先进行分解，把能开平方的数分解出来，剩下的不能开平方的数与字母相乘再配成能开平方的数，而字母的最小值就是这个不能 开平方的数。 7-2.(2)已知n -12是正整数，求实数n 的最大值； 解：因为n -20是正整数，所以满足,012 n -所以,12 n 所以根号内的数一定是一个平方数，即 n -20必定可化为()0,202 a a a n 且为整数=-这种形式，即()0,202 a a a n 且为整数=-。所以满足条件的平方数2a 有1，4，9。所以.3,8,11=n 最大值为11. 易错点：1.在计算或求值时，容易疏忽()0≥a a 是一个非负数。 2.在开方时，易出现()02 a a a =的错误。 3.二次根式的三个性质是正确进行二次根式化简、运算的重要依据。它们的结构相似，极易混淆，因此同学们必须弄清它们之间的区别与联系
高中英语错题集
高中英语错题集 1.The traffic lights____green and I pull away. A.came B.grew C.got D.went 2.So sundden _____that the enemy had no time to escape. A.did the attack B. the attack did C.was the attack D.the attack was 3.It’s said that Hellen _____abroad for many years,but I don’t know which school she is studying in. A.has studied B.has been studying C.studied D.studies 4.At the foot of the mountain______ A. a village B.lies a village C.does a village lie D.lying a village 5.She didn’t know how to cook Chinese food ____she came to China to study. A.since B.because C.after D.until 6.It____a long time since we last met in London. A.was B.had C.has been D.will 7.----What has he done? ---------He was heard _____up by his father last night. A. beating B.to beat C.to be beaten D.beat 8.It is your wisdom and ability,not the ______that do matter when you want to get respected by others. A.money B.treasure C.fund D.wealth 9.Ronald was ____to win the 100 meter hurdles,but he felt to the ground and missed the chance. A. possible B.probable C.likely D.maybe 需要复习的知识点 1.固定搭配go +颜色词，表示变成什么颜色 2.倒装，介词短语放句首，一定要用倒装，也就是后面的部分要用谓语+主语的形式 3.据说it’s said that/sb was/were heard that 4.现在完成进行时 5.not ….until 6.现在完成时的固定句型：it has been done since……. It has done since…… 7.it is …….,not …..that do matters……是什么重要而不是什么重要 8.sb be likely to do sth 某人很有可能干某事 答案：1-5DCBBD 6—9CCDC
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初中英语单选易错题附详解试题精编版.doc
1．Which do you enjoy _______ your spare time, playing cards at home or taking a walk in the park? A. spending B. to spend C. having spent D. to have spent 解析：同学们对于enjoy后接-ing动词记得很熟，已成思维定势，所以会不假思索地选A，而实际上此句enjoy的宾语是which，空白处应填入一个不定式，表目的，整句话的意思是 “你喜欢做什么来度过你的空闲时间，在家玩牌还是去公园散步？”故正确选项应为B。 另外，通过这道题我们还可以学到一个短语，spare time——空闲时间、闲暇时间，这 里spare作形容词，表示“空闲的，多余的”。free time也可以表示“空闲时间”。 2．I’m sorry I cannot help _____ the work. A. to finish B. finishing C. finished D. to finishing 解析：一些学生由于受cannot help doing sth.(禁不住做某事)这一习惯用法的影响，毫不犹豫 地选择了B。然而，只要仔细分析一下句子，根据句意，“对不起，我不能帮忙完成这项工作。”就可知道正确答案为A。cannot help to do sth.表示“不能帮助做某事”，这时，help后的不定式可带to也可不带to。 所以，同学们，当题中见到can't help的时候不要想当然的选doing形式哦，一定要根据句意来分析一下。 3．—Would you like some tea，please？ —Yes. I prefer tea _____ sugar. A. to B. for C. with D. of 解析：大家易受固定搭配prefer...to...（喜欢......而不喜欢......）的影响而错选A。本题题干意思为：“你想喝些茶吗？”“是的，我喜欢加糖的。”因此，名词tea后的词语作定语修饰它，tea with sugar表示“加糖的茶”，所以正确答案为C。 理解了这道题之后我们再来学习一下prefer的用法~ ★prefer+名词 ——Would you like meat or fish? ——I'd prefer meat, please. ★prefer+动名词 ——Do you like swimming? 你喜欢游泳吗？
二次根式单元 易错题难题提优专项训练试题
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1 2 =，其中正确的是（ ） A ．①②③④ B ．①②③ C ．①② D ．③④ 10．下列运算一定正确的是( ) A a = B = C ．222()a b a b ?=? D ()0n a m = ≥ 二、填空题 11．已知x =( )21142221x x x x -??+?= ?-+-??_________ 12．若0a >化成最简二次根式为________． 13．若m m 3﹣m 2﹣2017m +2015＝_____． 14．定义：对非负实数x “四舍五入”到个位的值记为()f x z ， 即：当n 为非负整数时，如果11 22 n x n -<+≤，则()f x n =z ． 如：(0)(0.48)0f f ==z z ，(0.64)(1.49)1f f ==z z ，(4)(3.68)4f f ==z z ， 试解决下列问题： ①f =z __________；②f =z __________； + =__________． 15．3 =，且01x <<=______． 16．甲容器中装有浓度为a ，乙容器中装有浓度为b ，两个容器都倒出m kg ，把甲容器倒出的果汁混入乙容器，把乙容器倒出的果汁混入甲容器，混合后，两容器内的果汁浓度相同，则m 的值为_________． 17．把 18．=== 据上述各等式反映的规律，请写出第5个等式：___________________________． 19．a ，小数部分是b b -=______. 20．1 =-=
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高三英语错题集一 1. ---Look! Someone _____ the floors. -- Well, it wasn’t me. I went shopping just now. A. had swept B. has swept C. was sweeping D. is sweeping 2. --- Sorry, it’s already 6 o’clock. I have to be off for an appointment. --- OK. _____________. A. It couldn’t be better B You really have me there C. Let’s call it a day D. Take your time 3. Nowadays many parents are trying to either prevent their children from failure, or protect them from the knowledge _____ they have failed. A. that B. when C. where D. which 4. ---How do you understand education is not an end, but a(n) ___ an end, professor? --- We do not educate children only for the purpose of educating them but for fitting them for life. A. error to B. means to C. answer for D. reason for 5. --- As a teenager, our son should have two or three hobbies to be really happy. ---_______, but how can he afford the time with so much homework every day? A. So does he B. So he does C. So should he D. So he should 6. I believe that this exhibition will open ____ window for foreigners to have ____ closer look at Chinese culture. A.the , a B. a, a C. a, the D. the, the 7. Carbon dioxide is said ______ the earth twice as quickly as previously feared. A. to be heated B. to be heating C. to have heated D. to have been heated 8. Only ____ the opening ceremony of the Poetry Club. The majority of the students were having a class then. A. a few people attended B. did a few people attend C. attended a few people D. a few people were attended 9. I hope that my father will quit smoking because I want him to live _____ my grandpa does. A. as a long and healthy life as B. as long and healthy a life as C. such long and healthy a life as D. so long and healthy a life as 10. The doctor had almost lost hope at one point, but the patient finally ______. A. pulled out B. pulled through C. pulled up D. pulled over 11. With the teacher ___ the concept of the context, we finally catch on to the inner meaning of it. A. bringing up B. bringing about C. bringing out D. bringing down 12. --- Did you go to visit her when she _____ in New York? ---- I _____to, but I was extremely busy. A. stayed, was intended B. stayed , intended C. was staying , have intended, D. was staying, had intended 13. How excited he was to see all the work he had spared no efforts to do ____ in the first round. A. recognizing B. to be recognized C. being recognized D. recognized 14. ____time permitting, we will go to Shanghai and visit our friends.
(完整)九年级化学上册易错题精选(新整理)
九年级化学上册易错题选集 一、选择题 1. 以下性质属于物质的化学性质的是（） A、铁生锈 B、浓盐酸的挥发性 C、碳酸氢铵的不稳定性 D、木炭的吸附性 2.某同学取8mL水并加热,提供的仪器有：①10mL量筒②100mL量筒③酒精灯④容积 20mL的试管⑤容积30mL的试管⑥试管夹⑦胶头滴管,所选用仪器合理的一组是（） A. ②③④⑥⑦ B. ①③⑤⑥ C. ①③⑤⑥⑦ D. ②③④⑥ 3. 某学生用量筒量取液体时，将量筒平放，且面对刻度平视测量。初次视线与量筒内液面的 最低处保持水平，读数为20ml。倒出部分液体后，俯视凹液面最低处,读数为5ml,则该学生实际倒出液体的体积（） A、等于15 B、小于15 C、大于15 D、无法确定 4.物质可分为纯净物和混合物，下列由同种元素组成的纯净物是（） A、蒸馏水 B、液氮 C、矿泉水 D、大理石 5.下列关于空气成分的说法正确的是 A.空气的成分按质量计算,氧气约占21% B.稀有气体常用于医疗急救 C.焊接金属时常用氮气作保护气 D.氧气是植物光合作用的重要原料 6.空气是一种宝贵的自然资源。下列对空气的说法中正确的是 A.空气中含量最多的是氧气,氧气可支持燃烧 B.臭氧(O3)属于稀有气体，主要分布在距地面10~ 50 km的高空 C. 稀有气体约占空气体积的0.03%，常充入灯管中作电光源。 D. 二氧化碳的排放过多，虽然对环境有影响，却不属于空气污染指数(API) 所规定项目 7.下列关于实验现象描述正确的是：（） A.碳在氧气中燃烧发出白光，放出热量，产生无色无味的气体 B.铁在空气中剧烈燃烧，火星四射，同时产生黑色固体。 C.磷在空气中剧烈燃烧，产生大量白色烟雾，并且放出大量热 D.硫在空气中燃烧，发出蓝紫色火焰，同时产生一种刺激性气味的气体 8. 下列对于实验操作及操作的目的描述正确的是：（） A．点燃系在螺旋状细铁丝下方的火柴后应立即伸入盛有氧气的集气瓶中 B．硫燃烧前，在集气瓶内预先放置水的目的是防止生成的气体造成空气污染 C．镁条在空气中燃烧所得产物为固体，故可用来测定空气中氧气含量 D．蜡烛熄灭时产生的白烟是石蜡不充分燃烧生成的的石蜡固体小颗粒 9.下列说法正确的是：（） A、氧气用于气割和气焊，其中都伴随了化学变化。 B、空气是一种宝贵的资源，由氧气和氮气两部分组成。 C、1L水中可溶解30mL氧气，因此氧气易溶于水 D、催化剂可改变化学反应速率和生成物的质量，自身的质量和性质都不改变。 10. 下列说法正确的是：（） A.蒸馏水不易养鱼是因为蒸馏水中不含氧分子 B.氧化反应都发光放热 C.加入氢氧化钠均可增强溶液导电性,使同质量的水分解速率比原来快,产生气体也更多。 D.将过氧化氢溶液缓慢滴加到盛有少量二氧化锰的试管中，比较容易控制产生氧气的气流 11.SO2和CO2两种物质中含有相同的是（） A、氧分子 B、氧元素 C、氧原子个数 D、氧的质量分数 12.相同数目的SO2和CO2分子中含有相同的（） A、氧分子 B、氧元素 C、氧原子个数 D、氧的质量分数 13.下列微粒中，质子数少于核外电子数的微粒是（） A.OH— B.NH4+ C.H2O D. O2 14.下列物质含有氧分子的是（） A.过氧化氢 B.四氧化三铁 C.液态空气 D.二氧化碳 15.下列元素的化学性质相似的是（）
八年级数学下学期《二次根式》易错题集
《二次根式》易错题集 易错题知识点 1．忽略二次根式有意义的条件，只有被开方数 a≥0时，式子a才是二次根式；若a<0，则 式子a 就不能叫二次根式，即 a 无意义。 2．易把 2 a与2) (a混淆。 3．二次根式的乘除法混合运算的顺序，一般从左到右依次进行或先把除法统一成乘法后，再用乘法运算法则计算。 4．对同类二次根式的定义理解不透。 5．二次根式的混合运算顺序不正确。 典型例题 选择题 1．当a＞0，b＞0时，n是正整数，计算的值是（） A．（b﹣a）B．（a n b3﹣a n+1b2）C．（b3﹣ab2）D．（a n b3+a n+1b2） 考点：二次根式的性质与化简。 分析：把被开方数分为指数为偶次方的因式的积，再开平方，合并被开方数相同的二次根式． 解答：解：原式=﹣ =a n b3﹣a n+1b2 =（a n b3﹣a n+1b2）． 故选B． 点评：本题考查的是二次根式的化简．最简二次根式的条件：被开方数中不含开得尽方的因式或因数． 2．当x取某一范围的实数时，代数式的值是一个常数，该常数是（）A．29 B．16 C．13 D．3 考点：二次根式的性质与化简。 分析：将被开方数中16﹣x和x﹣13的取值范围进行讨论． 解答：解：=|16﹣x|+|x﹣13|， （1）当时，解得13＜x＜16，原式=16﹣x+x﹣13=3，为常数； （2）当时，解得x＜13，原式=16﹣x+13﹣x=29﹣2x，不是常数； （3）当时，解得x＞16；原式=x﹣16+x﹣13=2x﹣29，不是常数；
（4）当时，无解． 故选D 点评：解答此题，要弄清二次根式的性质：=|a|，分类讨论的思想． 3．当x＜﹣1时，|x﹣﹣2|﹣2|x﹣1|的值为（） A．2 B．4x﹣6 C．4﹣4x D．4x+4 考点：二次根式的性质与化简。 分析：根据x＜﹣1，可知2﹣x＞0，x﹣1＜0，利用开平方和绝对值的性质计算． 解答：解：∵x＜﹣1 ∴2﹣x＞0，x﹣1＜0 ∴|x﹣﹣2|﹣2|x﹣1| =|x﹣（2﹣x）﹣2|﹣2（1﹣x） =|2（x﹣2）|﹣2（1﹣x） =﹣2（x﹣2）﹣2（1﹣x） =2． 故选A． 点评：本题主要考查二次根式的化简方法与运用：a＞0时，=a；a＜0时，=﹣a；a=0时，=0；解决此类题目的关键是熟练掌握二次根式、绝对值等考点的运算． 4．化简|2a+3|+（a＜﹣4）的结果是（） A．﹣3a B．3a﹣C．a+D．﹣3a 考点：二次根式的性质与化简；绝对值。 分析：本题应先讨论绝对值内的数的正负性再去绝对值，而根号内的数可先化简、配方，最后再开根号，将两式相加即可得出结论． 解答：解：∵a＜﹣4， ∴2a＜﹣8，a﹣4＜0， ∴2a+3＜﹣8+3＜0 原式=|2a+3|+ =|2a+3|+ =﹣2a﹣3+4﹣a=﹣3a． 故选D． 点评：本题考查的是二次根式的化简和绝对值的化简，解此类题目时要充分考虑数的取值范围，再去绝对值，否则容易计算错误． 5．当x＜2y时，化简得（）
高考英语45套错题集
45套错题集 （D ）1. Now we are faced with a shortage of electricity, which is found to be the ______ in many other cities of our country. A. example B. condition C. matter D. case ( B ) 2. The United States is trying to _____ the serious problems resulting from the energy crisis. A. step up B. cope with C. cut off D. end up ( C)3. ---But for your timely warning, we _____ into great trouble. --- You know we’re friends. A. would get B. must have got C. would have got D. can’t have got ( A)4. Ladies and gentlemen, due to an expected accident, one of the singers who all of you _____ to hear _____ tonight. A. have come;won’t be performing B. come, won’t perform C.had come; don’t perform D.came; wouldn’t perform ( A)5. The secretary was allowed ten more minutes. She _____ her boss’ patience and tried to hurry. A. sensed B. tolerated C. realized D. understood ( C)6. Feeling more and more pressure from the environment______,the government has decided to close down the factories pouring out poisonous chemicals. A. polluted B. having polluted C. being polluted D. having been polluted ( A)7. To work at home, which one could hardly imaginf, has been made______ with the development of computer technology. A. possible B. it possible C. possibly D. to be possible ( D)8. --- I hope that you can remove the difference between you and Susan and become good friends. ---______. If only Susan had the same idea. A. My pleasure B. It’s a pleasure C. By no means D. By all means ( A)9.Attracting _____ senior citizens, Florida is ______ home to the largest population of elderly Americans. A. /;/ B. the; the C. the; / D. /; a ( C)10. If the first few sentences of your application letter fail to win the reader’s attention, the rest of the letter_____ not be read at all. A. must B. shall C. may D. can ( D)11.Little Anna’s parents walked slowly, one after_______, through the shallow water of a stream to search for her lost bag. A. another B. other C. others D. the other ( B)12. My headache is killing me. I ____ it ____ away. But now it’s getting orse and worse. A. think, is going B. thought, was going C. have thought, is going D. had thought, was going ( A)13. The government is trying to do something to _______ a better understanding between the two countries. A.promote B. raise C. improve D. increase ( C)14. Some people are born with the belief _____ they are masters of their own while others feel _____ they are at the mercy of others. A. what;that B. that;that C. that;/ D./;that ( B)15. This is a strange and confusing age.We’ve been all the way to the moon and back, but have trouble crossing the street _____ the new neighbour. A. meeting B. to meet C. having met D. to have met ( B)16.Research sshows that people feel unhppy and worried when they have nothing to do. ______, the happiest are those who are busy. A. In short B. In fact C. As a result D. For one thing ( A)17. With so many construction projects_____ all the strengthh out of the economy, people of the small country complained a lot. A. sucking B. to suck C. being sucked D. being sucking ( D)18. 10,000 dollars is a large sum of money, but it is still_____ than we need for a new house. A. very few B. very little C. far fewer D. far less ( B)19. ---Why didn’t Mike attend the evening party? ---He is a quiet boy. He loves reading at home ______ to parties. A. than go B. rather than going C. than going D. more than goes ( D)20. We are asking people to ______ goods from companies that use child labour. A. refuse B. resist C. reject D. boycott ( C)21. _____ by the heavy snowfalls, Chenzhou, a city in South China, was cut off from the outside, _____ water and electricity shortage. A. Having struck,facing B. having struck, faced