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六年级数学易错易混题

六年级数学易错易混题一、培优题易错题1．列方程解应用题：（1）一个箱子，如果装橙子可以装18个，如果装梨可以装16个，现共有橙子、梨400个，而且装梨的箱子是装橙子箱子的2倍．请算一下，装橙子和装梨的箱子各多少个？（2）一群小孩分一堆苹果，每人3个多7个，每人4个少3个，求有几个小孩？几个苹果？（3）一架飞机在两城之间飞行，风速为24千米/时．顺风飞行需要2小时50分，逆风飞行需要3小时，求无风时飞机的速度和两城之间的航程．【答案】（1）解：设装橙子的箱子x个，则装梨的箱子2x个，依题意有18x+16×2x=400，解得x=8，2x=2×8=16．答：装橙子的箱子8个，则装梨的箱子16个（2）解：设有x个小孩，依题意得：3x+7=4x﹣3，解得x=10，则3x+7=37．答：有10个小孩，37个苹果（3）解：设无风时飞机的航速为x千米/小时．根据题意，列出方程得：（x+24）× =（x﹣24）×3，解这个方程，得x=840．航程为（x﹣24）×3=2448（千米）．答：无风时飞机的航速为840千米/小时，两城之间的航程2448千米【解析】【分析】（1）根据梨和橙子与各自箱数分别相乘，相加为两者的总数，求出装梨和橙子的箱子数。

（2）利用两种分法的苹果数是相同的，列出方程求解出小孩数和苹果数。

（3）利用逆风和顺风的路程是相同的，列出方程求出速度，再利用速度和时间求出航程。

2．下列图表是2017 年某校从参加中考体育测试的九年级学生中随机调查的10 名男生跑1000 米和 10 名女生跑 800米的成绩.（1）按规定，女生跑 800 米的时间不超过 3'24"就可以得满分.该校九年级学生有 490 人，男生比女生少 70 人.请你根据上面成绩，估计该校女生中有多少人该项测试成绩得满分? （2）假如男生 1 号和男生 10 号被分在同组测试，请分析他俩在 400 米的环形跑道测试的过程中能否相遇。

3604易错易混题型(专项训练)-三年级下册数学人教版 (1)

人教版数学三年级下册期末总复习——易错易混题型1.将一支铅笔竖直插入水中,这时铅笔有 8.2 厘米是干的，再调过头来插入水中,这时铅笔还有 0.8 厘米是干的，这支铅笔有多长?2.李琳在计算一道三位数除以一位数的除法时,把被除数 429 错写成492,这样商比原来多7，而余数正好相同,这道题正确的除数、商和余数分别是多少?3.某地出租车的起步价是 2 千米以内 7 元,每超过1千米多收 1.6 元,小到奶奶家一共要付多少钱?4.下面是红红晚上睡觉前从镜子里看到的钟表,你知道当时的时间用 24 时计时法表示是什么时间吗?5.在建设路旁有一个交通标志牌(如右图)。

张叔叔晚上 9:45 开着大货车通过这条路，违反交通规则了吗?6.馨雅小区有一块长 30 米,宽 2 米的长方形草坪,如果在草坪的正中央修一个边长 12 米的正方形喷泉池，剩下的草坪的面积是多少平方米?7.李奶奶想建一个长方形的鸡圈,且一面靠墙,用 36 米的篱笆正好围成。

这个鸡圈的长是16 米，它的面积是多少平方米?8.养鸡场共养了 42 只公鸡和 56 只母鸡,一只鸡一个月平均能下蛋 23个,这些鸡一个月能下蛋多少个?9.马小虎在做两位数乘两位数的计算题时，把第二个乘数 42 个位上的 2 看成了 5，结果比正确的积多114,正确的积应该是多少?10.被除数、除数、商和余数的和是 597,商是 6,余数是 5，除数是多少?11.教室的黑板在北方。

小兰的北面是小明,西面是小亮南面是小宇。

小丽坐在小明的东面。

小勇坐在小丽的南面，小宇的东面。

12.警察叔叔追击一个逃犯。

逃犯在甲地以每小时 10 千米的速度逃跑，警察叔叔接到命令,以每小时 30 千米的速度开始从乙地追击。

已知甲、乙两地相距 56 千米,警察叔叔 3小时能追上逃犯吗?13.一间长方形会议室长 12 米,宽 6 米,如果用面为9 平方分米的正方形地砖铺地，铺完这间会议室的地面至少要用多少块这样的地砖?14.豆腐店有 10 袋黄豆,每袋 50 千克。

语法填空动词时态易混易错题集

语法填空动词时态易混易错题集1. --- Oh, dear. I forgot the air tickets.--- You ______ always _______（leave）something. 2."When he _____(come) is not known yet." "But when he ____ (come), he will be warmly welcomed."3. Remember to send me a photo of us next time you ______ （write）to me.4. I first met Tom ten years ago. He ______ (work) in a radio factory at that time.5. --- Have you finished the report?--- No. I ______ (do) it all this week.6.I can guess you were in a hurry. You ______(wear) your sweater inside out.7.--- We ______ (expect) that you would fix the TV set this week.--- I’m sorry. I ______ (intend) to fix it this week, but I’ve been too busy.8.They won’t buy new clothes because they ______ (save) money to buya new house.9.The traffic in our city is already good and it ______ (get) even better.10.I know Mr. Brown; we ______ (introduce) to each other at an international conference.11.Don’t bother to look for my dictionary --- it ______（turn）up some day.12.The plane ______ (leave) at 7:00 pm, so I have to be at the airport by 6:40 at the latest.13.I used to drink a lot of tea but these days I ______ ( prefer) coffee.14.I want to buy that kind of cloth because I ______ (tell) the cloth ______ (wash) well.15.--- Look at the black clouds. It ______ (rain) soon.--- Sure. If only we ______ （not come）out.16.She ______ no sooner ______ (get) to the office than she got down to writing the report.17.When he was alive, the old scientist used to say that knowledge ______ (come) from practice and he gained his experience by doing a lot of practical work.18.You won’t know whether the coat fits you until you ______ (try) it on.19.______ (leave) it with me and I’ll see what I can do.20.--- How are you planning to travel to Shanghai?--- I ______ (not decide)yet, but I ______ (consider)taking a train. 21.With the development of science, more new technology ______ (introduce) to the field of IT.22.The baby is generally healthy, but every now and then he ______(catch) a cold.23.--- I’m sorry, but there’s no smoking on this flight.--- Oh, I ______ (not know) that. Sorry, I won’t again.24."I _____(forget) his telephone number." "I have his number, but I ____ (forget) to bring my phone book."25.I had hoped to see her off at the station, but I _____（be）too busy. was26."You've left the light on." "Oh, so I have. I _____ (go) and turn it off."27.The traffic accident wouldn't have happened yesterday, but the driver _______ (be) really careless.28."Your phone number again? I _____ (do not ) quite catch it." "It's 4331577."29.The bridge, which _____ (date) from 1688, needs repairing.30."It's twelve o'clock, I think I must be off now." "Oh, really? I ______ (not realize) it at all."31.He is very busy. I don't know if he _____ (come) or not tomorrow.32.He has changed a lot. He _______ (be) not what he _______ (be).33.Mr Smith ______ (write) a book about China last year but I don't know whether he has finished it.34.Dear me! Just _____ (look) at the time! I _____ (have) no idea it was so late.参考答案：1.are, leaving2.will come, comes3.write4.was working5. have been doing6. are wearing7. had expected; had intended8. are saving9. is getting10. were introduced11.will turn12.leaves13. prefer14. have been told; washes15. is going to rain; hadn’t come16. had; got17. comes18. have tried19. leave20. haven’t decided; am considering21.is being introduced22. does catch/catches23. didn’t know24. forget, forgot25. was26. will go27.Was28. didn't29. dates30. didn’t realize31. will come32. is, was33. was writing34. look, had。

小学数学1-6年级各10道易错重点题(附答案)

一年级十大易错重点题【重点1】小芳拍球拍了50下，小明拍的比小芳少一些。

（1）小明可能拍了多少下？（请打“√”）（2）小明最多拍了（）下。

【分析】因为“小明拍的比小芳少一些”，这就说明小明拍的球比“50下”少一点。

“12下”比“50下”少得多，而“52下”是比“50下”多一些，都不符合要求。

所以比“50下”少一些应该是“47下”。

“小明最多拍了（）下”这个问题，首先要了解“最多”的意思，其实应该是在比“50下”少的范围内的一种“最多”情况。

故而因比“50下”只少“1下”，才算“最多”的情况，即“49下”。

【重点2】小文看一本童话书，第1天看了16页，第2天看了20页，第3天应该从第（）页开始看起。

【分析】小朋友容易理解为第3天从第（21）页开始看起。

其实第3天看的页数应该在第1天和第2天的基础上再往下看的，因此要先求出小文第1天和第2天一共看的页数：16＋20＝36（页），再用36＋1＝37（页），即第3天应该从第（37）页开始看起。

【重点3】王叔叔收了一批鸭蛋，前3天卖出30个，还剩8个。

他一共收了多少个鸭蛋？【分析】此题关键要理解“前3天卖出30个”这个条件的意思，它是指前3天一共卖出30个，而并不是前3天每天都是卖出30个。

因此，这题要求“一共收了多少个鸭蛋”，只要把“共卖出的30个”和“还剩的8个”合起来就行。

题中的“前3天”在解题时不起作用。

【重点4】在计数器上用5颗珠表示两位数，最大可以表示多少？最小呢？先画一画，再填空。

最大是（）最小是（）【分析】用5颗珠表示两位数，最大应该把这5颗珠都放在十位上，即50；最小的话应该尽量多的把珠放在个位上，但由于是两位数，十位上必须得保留一颗，即14。

其实这题还可继续思考：5颗珠还能表示出哪些两位数呢？可以有序地拨一拨，从最大的50开始，每次把一颗珠拨到个位，直至14。

也就是说，用5颗珠表示的两位数有：50、41、32、23、14。

【重点5】学校有55个篮球，五年级借走16个，六年级借走25个。

有理数的易混易错题

第二章有理数易混易错题一．分类讨论思想：1．在数轴上到-4.5的距离为9的点所表示的数是________8．若|x|＝|y|，且x＝－3，则y＝________.9．若|－x|＝－(－8)，则x＝______，若|－x|＝|－2|，则x＝________.10．(1)已知|a|＝5，|b|＝8，且a<b，则a＝________，b＝________；(2)有理数a，b在数轴上的位置如图所示，若|a|＝4，|b|＝2，求a，b的值．11．如图，数轴的单位长度为1，如果点B表示的数的绝对值是点A表示的数的绝对值的3倍，那么点A 表示的数是________．12．已知x是整数，且3≤|x|＜5，则x＝______________．二．特值法：2.=5=8a3.a7,10,a-bm4,6,m,m3-1,m________6.a,b a=6b17.-x34,x________.(3)x26a bbn n m n nmbx====+=+--=---==++-已知，，且满足a+b＜0，则求-b的值若则求的值4.已知且则求的值5.如果则的值为已知互为相反数，且，计算的值数轴上两点分别表示5与2，则(1)这两点距离为_________;(2)已知则同理表示数________x2610,_______.(4)26xxx x++-=++-轴上有理数所对应的点到和所对应的两点的距离之和，请你找出所有符合条件的有理数的x，使得这样的数是是否有最小值？如果有，写出最小值；如果没有，说明理由()1..0b0bb,02.0--A aa a ba b-下列结论不正确的是若＜，＞，则a-b＜0B.若a＞0，＜0，则a-b＞0C.若a＜0，b＜0，则a-(-b)＞0D.若a＜0，b＜0，且＞则＜若＜＜，则a与b的大小关系是__________3.与比较大小，必定为（）.A．B．C．D．这要取决于b4. 有理数a,b,c的大小关系如图：则下列式子中一定成立的是（）.A．B．C．D．5. 如图，有理数对应数轴上两点A，B，判断下列各式的符号：________0；________0；0；________0.6.已知满足，则代数式的值是________7.已知a，b是有理数，且a，b异号，则|a＋b|，|a－b|，|a|＋|b|的大小关系为_____________________________.三.数形结合思想：1．将一刻度尺如图所示放在数轴上（数轴的单位长度是1cm），刻度尺上的“0cm”、“15cm”分别对应数轴上的，则（）.A．B．C．D．2. 如图：数轴上标出若干个点，每相邻两点相距1个单位，点A、B、C、D对应的数分别是整数a,b,c,d，且b-2a=9,那么数轴的原点对应点是（）.A．A点B．B点C．C点D．D点3．绝对值不大于3的所有整数为________________________________________．4.已知a＞0，b＜0，且|b|＜a，试比较a，－a，b，－b的大小.5.某同学在做数学作业时，不小心将墨水洒在所画的数轴上，如图，被墨水污染部分的整数点有个.（第1题）6.在数轴上任取一条长为2 01613个单位长度的线段，则此线段在数轴上最多能盖住的整数点的个数为（）A.2 017B.2 016C.2 015D.2 014111 7.(1) 1.50-3----422在数轴上表示下列各数：，，，（），，并利用“＜”把它们连接起来；四．简便计算：（1）. 请你设计一种几何图形求的值.1011001110802-29-98173-3619184981212115--+36941832156-13+0.34+-13+0.34273717-2-28-2+-2⨯⨯⨯÷÷⨯⨯⨯⨯（）（）（）（）（）（）（）（）（）（）（）（）（）（）（）（）（）第三章整式及其加减一．代数式知识概要代数式的定义____________________________________________________________代数式的书写要求：_______________________________________________________ 典例精讲1. 在式子m+5,ab,a=1,0,π,3(x+y),2n k180,x>3中，是代数式的有( )A 6个B 5个C 4个D 3个2.一个两位数，个位上的数是a，十位上的数字比个位上的数小3，这个两位数为__ _______，当a=5时，这个两位数为___.3.比x和y2的差的一半大3的数应表示为_________________________.4.某品牌服装以a元购进，加20%作为标价.由于服装销路不好，按标价的八五折出售，降价后的售价是__________元，这时仍获利________________________元.5.某书每本定价8元，若购书不超过10本，按原价付款；若一次购书10本以上，超过10本部分打八折。

2024年高考英语易错题(新高考专用)易错点07动词的时态和语态(4大陷阱)

易错点07 动词的时态和语态目录01 易错陷阱（4大陷阱）02 举一反三【易错点提醒一】一般现在时、一般过去时和现在完成时易混易错点【易错点提醒二】一般过去时和过去完成时易混易错点【易错点提醒三】现在完成时和过去完成时易混易错点【易错点提醒四】主动语态与被动语态易混易错点03 易错题通关易错陷阱1：一般现在时、一般过去时和现在完成时易混易错点。

【分析】【高考链接】（2023年浙江卷1月）The large siheyuan of these highranking officials and wealthy businessmen often________ (feature)beautifully carved and painted roof beams and pillars(柱子).【答案】featured【解析】考查动词时态。

句意：这些高级官员和有钱商人的高大的四合院，通常以雕刻精美和被粉刷的房顶横梁和柱子为特点。

分析句子结构可知，空格处需要填谓语动词，再结合and后动词时态可知，空格处应用一般过去时。

故填featured。

易错陷阱2：一般过去时和过去完成时易混易错点。

【分析】1.下列动词hope、wish、expect、think、intend、mean、suppose等，用过去完成时表示“原本……(事实上未能……)”。

2.This/It/That was the first/second/third ... time that ...表示“这/那是(某人)第几次做某事”，that从句中要用过去完成时。

3.hardly ... when ...和no sooner ... than ...两个句型中，主句均用过去完成时。

易错陷阱3：现在完成时和过去完成时易混易错点。

【分析】易错陷阱4：主动语态和被动语态易混易错点。

【分析】➢受母语干扰，翻译上下文时混淆被动语态与主动语态。

➢混淆谓语动词被动语态构词be+done与非谓语动词重点过去分词done。

易混易错对比练习150题

2021年外研版英语中考复习—易混易错对比练习（150题）1. Only those _________ knew well could be let in.Only those _________ knew him well could be let in.A. did heB. heC. whoD. that2. When you read the map, you'd better make a mark _________ you have any question. When you read the map, you'd better make a mark _________ you have paid a visit to.A. at whenB. at the placeC. the place whereD. where3. He fell ill. That was _________ he didn't show up.He fell ill. That was _________ he overworked himself.A. causeB. reasonC. whyD. because4. ---Who were the people with the flag?---A group _________ itself the League for Peace.---Who were the people with the flag?---A group _________ the League for Peace.A. callsB. callingC. calledD. is called5. This is such a good book _________ every one of us likes to read.This is such a good book _________ every one of us likes to read it.A. thatB. whichC. andD. as6. Dorothy was always speaking highly of her own role in the play, _________ , of course, made the others unhappy.Dorothy was always speaking highly of her own role in the play. _________ , of course, made the others unhappy.A. whoB. whichC. ThisD. what7. I'll never forget the day _________ I joined the League.I'll never forget the day _________ I spent in my hometown.A. whereB. thatC. whenD. what8. Jim _________ a poem last night; now he is going on with it.Jim _________ a poem last night; now he is typing it.A. wroteB. writesC. was writingD. is writing9. That is all _________ you must do.That is _________ you must do.A. thatB. whichC. whatD. whether10. Is this the factory _________ you visited?Is this factory _________ you visited?Is this the factory _________ you used to work?Is this factory _________ you used to work?A. whereB. whichC. the oneD. that11. Those pupils like dancing, two of _________ are boys.Those pupils like dancing and two of _________ are boys.A. whoB. themC. whichD. whom12. He was told about it many times, _________ he still couldn't understand it.Having been told about it many times, _________ he still couldn't understand it.A. soB. butC. howeverD. /13. This place is _________ they fought the enemy.This place is _________ they call “Pleasant Garden”.A. whereB. whichC. the onesD. what14. _________ leaves the room last ought to turn off the lights._________ leaves the room last, he ought to turn off the lights.A. AnyoneB. WhoeverC. WhoD. No matter who15. She looked _________ at her old and sick father.She looked _________ at the sight of her old and sick father.A. worryB. worriedC. worriedlyD. worrying16. It was October 1, 1949 _________ New China was founded.It was on October 1, 1949 _________ New China was founded.A. thatB. on that dayC. whenD. on that17. I have a puzzling problem _________ myself today.I have a puzzling problem _________ by you today.A. solvingB. solveC. to solveD. to be solved18. In front of the building there is a beautiful garden, _________ owner seated in it, playing chess with his little son.In front of the building there is a beautiful garden, _________ owner is seated in it, playing chess with his little son.A. whoseB. itsC. whichD. that19. He often speaks of the trouble he _________ helping the orphan.He often speaks of the trouble he _________ to help the orphan.A. hadB. foundedC. takenD. took20. It is the first time _________ I've visited China.It won't be long _________ you regret what you've done.It is almost three years _________ I last saw you.It was five o'clock _________ he came back.A. whenB. thatC. sinceD. before21. The bird left its nest early _________ worms.The bird left its nest early, _________ worms.A. catchB. to catchC. caughtD. catching22. I don't believe the news _________ he had told us.We all believed the news _________ our football team had won the match.A. thatB. that/whichC. whatD. on which23. We would like _________ skating on real ice.We feel like _________ skating on real ice.A. wentB. goneC. goingD. to go24. To finish so much work in so little time is _________.To finish so little work in so much time is _________.A. out of questionB. out of the questionC. possiblyD. impossibly25. Who is the man _________ is standing there?Do you know the man _________ is standing there?A. thatB. whomC. whoseD. who/that26. He is _________ a fool as to believe that.He is _________ foolish as to believe that.A. soB. asC. suchD. too27. _________ is no need for us to discuss the question again._________ is no good our discussing the question again.A. ItB. ThereC. HereD. That28. He was _________ good a teacher that every student loved him.He was _________ good a teacher as our class teacher.A. soB. suchC. asD. that29. After a long walk, the old man isn't _________ tired.Though he has been working since morning, he isn't _________ tired.A. a bitB. a lotC. a littleD. a few30. It is about ten days _________ he returned home.It was ten days ago _________ he left home.A. beforeB. thatC. sinceD. after31. Work hard, _________ you will succeed.Work hard, _________ you will fail.A. andB. orC. else orD. so32. There is your bike, isn't _________ ?There is a bike, isn't _________?A. oneB. itC. thereD. that33. The bag made of plastics costs less than _________ made of cloth.A bag made of plastics costs less than _________ made of cloth.A. itB. oneC. thatD. this34. Mother told me to clean the room, and I did _________.My parents had left for Beijing, I know about _________.A. soB. thisC. itD. that35. Lei Feng was _________ ready to help others.To a diligent student, English is _________ difficult to learn.A. quite tooB. only tooC. not tooD. much too36. Can you _________ Tom _________ his twin brother?Did you _________ Tom _________ his twin brother?A. talk; aboutB. tell; fromC. take; forD. talk; with37. They went in search _________ the missing boy.They joined in the search _________ the missing boy.A. toB. ofC. forD. on38. It was said _________ was all that he had said.It was quite true _________ the teacher said moved us to tears.A. what thatB. that thatC. that whatD. what what39. _________ will you do with the naughty boy?_________ will you deal with the naughty boy?A. HoweverB. WhatC. HowD. why40. He doesn't play football _________ play basketball.The old man has no son _________ no daughter.A. andB. neitherC. orD. either41. Jack is the cleverest _________ the four boys.Jack is _________ the most clever boys in his family.A. betweenB. amongC. ofD. belong42. Do me _________ favour of closing the window for me.Do me _________ favour by moving the big stone.A. aB. theC. myD. an43. She is the youngest of all _________ sisters in her family.She is younger than all _________ sisters in her family.A. theB. herC. thatD. those44. I have never known such a gentleman _________ that.You mustn't speak to such a gentleman _________ that.A. likeB. alikeC. asD. likely45. Mr White can pay _________ high a price as the seller asked for.Mr White was _________ good a doctor that his patients all loved him.A. soB. asC. suchD. that46. Let us go out for a walk, _________ ?Let me try, _________ ?Let's stop here, _________?A. may IB. will youC. shall weD. can you47. It is up _________ you to give them all the help you can.It is easy _________ you to finish the task ahead of time.It is kind _________ you to help me out.A. toB. ofC. forD. by48. Mary is good _________ Chinese.It is good _________ you to do morning exercises.Sports do good _________ us all.A. toB. atC. forD. of49. Our monitor set up a good example _________ all of us.The boy gave his life _________ his country.After school, we asked a question _________ our teacher.A. toB. ofC. forD. with50. The two brothers look very much _________, and I can't tell one from the other.I wonder what he is _________.They are _________ to come to help us with our work soon.A. likeB. alikeC. likelyD. as51. It was eight o'clock he left here.It is at eight o'clock he will leave here.It is eight hours he left here.It will be eight hours we meet again.A. whenB. thatC. beforeD. since52. She will never forget the date we spent together.She will never forget the date she was born.A. thatB. on whichC. whenD. both B and C53. Was it on Oct. 1st, 1949 the PRC was founded?Was it Oct. 1st, 1949 the PRC was founded?A. in whichB. on thatC. thatD. when54. We would rather die give in.We preferred to die give in.A. whenB. toC. thanD. rather than55. It was not until his father died he came home.It is not long his father died.It was not long his father died.It was not long he was born that his father died.A. beforeB. afterC. sinceD. that56. Is this the school they built last year?Is this school they built last year?Is this school they lived last year?Is this the school ________ they lived in last year?Is this the school ________ they lived last year?A. the oneB. whichC. whereD. on which57. He sent us many books, none of ________ is liked by all.He sent us many books, but none of ________ is liked by all.He sent us many books, of which ________ is liked by all.A. themB. thatC. whichD. none58. ________ is known to us all is that the sun rises in the east.________ is known to us all that the sun rises in the east.________ is known to us all, the sun rises in the east.A. WhichB. ItC. AsD. What59. She wants to buy the same bike ________ I lost last week.I saw her driving the same car________ I lost last week, so I told a policeman about it.I want to buy the same car ________ I sat last week.A. thatB. asC. whichD. where60. They don't know ________ with the problem.They want to know ________ it.They don't know ________ the problem.A. what to doB. how to doC. how to deal withD. what to deal61. ________ hard, and you will pass the exam.________ hard, you will pass the exam.A. WorkB. WorkingC. To workD. Worked62. I'll have him ________ the radio for you.I'll have him ________ the radio the whole morning.I'll have the radio ________ tomorrow.I have a radio ________ today.A. repairB. repairingC. repairedD. to repair63. Betty looked ________ at the news.Betty looked ________ at me.A. sadB. sadlyC. sadnessD. sadden64. China is larger than ________ country in Africa.China is larger than ________ country in Asia.A. any otherB. anyC. allD. the other65. There ________ no bus, we walked home.There ________ no bus and we walked home.A. areB. wasC. beingD. be66. Bill's pale face suggests that he ________ in poor health.Bill suggested that he ________ praised.A. beB. isC. wereD. would be67. She didn't come back ________ her mother went to bed.She won't come back ________ her mother asks her to.A. unlessB. ifC. untilD. when68. ________ in the film, we decided to see it again.________ by the film, we decided to see it again.A. InterestedB. InterestingC. Being interestedD. To interest69. Would you please do me ________ favour?Would you please do me ________ favour to buy some stamps?A. aB. anC. theD. /70. The girl ________ in a red coat is Lily.The girl ________ a red coat is Lily.A. dressingB. dressedC. wearingD. wears71. His Japanese is so poor that he can't make himself ________. His Japanese is so poor that he can't make others ________ him.A. to understandB. understoodC. understandD. understanding72. ________ at his desk, he was deep in thought.________ himself at his desk, he was deep in thought.A. SeatB. SittingC. Having seatedD. Seating73. ________ we shall go for a picnic tomorrow is certain.________ we'll go for a picnic tomorrow is uncertain.A. ThatB. IfC. WhetherD. What74. South of the village ________ a lake two years ago.He ________ his hand on my head.A. lieB. layC. laidD. lain75. Our teacher entered the classroom, ________.Our teacher entered the classroom, with ________.A. a book in handB. book in handC. a book in his handD. book in his hand76. Peter ________ getting up early now.Peter ________ get up early.A. is used toB. was used toC. used toD. uses to77. We'll do whatever we can ________ her with her maths.We said we could ________ her with her maths.A. helpingB. to helpC. helpD. helped78. Five years later he turned ________ engineer.Five years later he became ________ engineer.A. anB. aC. /D. the79. Who is the greatest poet ________ today?He is one of the best ________ posts.A. livingB. aliveC. to liveD. lived80. ________ hearing the news, he rushed out.They were overjoyed ________ the news of his safe return.A. OnB. AtC. onD. at81. The reason was ________ I was late.The reason ________ he gave us was unreasonable.The reason ________ he was late was that he was ill.A. thatB. whichC. whyD. because82. He is very kind. If you are in trouble, he can't help ________ the problem. He is in trouble, but I can't help ________ the problem.A. solveB. solvingC. solvedD. to be solved83. The theory he stuck to ________ true.He stuck to ________ the truth of the theory.A. proveB. provedC. provingD. being proved84. It is in the classroom ________ you can find it.It is in the classroom ________ you can find it there.A. andB. thereC. thatD. which85. He has three sons, ________ are doctors.He has three sons and ________ are doctors.A. all of whoB. all of whomC. all of themD. three of them86. ________ from the hill, the village looked more beautiful.________ from the hill, I found the village looked more beautiful. ________ from the hill and found the village looked more beautiful.A. SeeingB. SeenC. I sawD. I seeing87. I prefer ________ in the country rather than ________ in the city.I prefer ________ in the country to ________ in the city.A. living; liveB. live; livingC. living; livingD. to live; live88. ---What made him so upset? --- ________ his dictionary.---Why was he so upset? --- ________ his dictionary.A. LostB. To lostC. LosingD. Because he lost89. He was considered ________ the first phone in the world.He was considering ________ a new machine to help the farmers.A. to have inventedB. inventingC. to inventD. having invented90. Let's go to school together, ________?Let us go to school together, ________?A. will youB. shall weC. won't youD. shan't we91. I think you are right, ________?You think I am right, ________?A. do youB. are youC. don't youD. aren't you92. His teacher always encourages him not to lose ________ heart.He found that he lost ________ heart to one of his friends.A. hisB. myC. /D. a93. He worked very hard. ---________.She worked very hard. ---________.His mother asked him to work hard and ________.A. So did heB. So he didC. he did soD. so did he94. He was ________ a little boy that he could not tell this one from that one.He gave me ________ little money that I had to borrow some money from my classmates.A. allB. in orderC. suchD. so95. I wanted the photos ________.The photos needed ________.A. developingB. developedC. to developD. being developed96. He suggested that I ________ here at once.It suggested that he ________ here three days before.A. shall leaveB. has leftC. had leftD. leave97. His parents forbid him ________.It forbids ________ in hospital.A. to smokingB. smokingC. smokedD. to smoke98. He must have been here for several days, ________?He must have come here the other day,________?A. mustn't heB. didn't heC. hasn't heD. needn't he99. He was late again, ________ made the teacher angry.He was late again, ________ we had expected.A. whatB. itC. whichD. as100. The population of China ________ 1.2 billion.One third of the population of China ________ farmers.Half of the hill ________ covered with trees.Half of the hills ________ covered with trees.A. isB. areC. haveD. has101. Tom said that he would make up his _______ to do the work well.I'm sorry, I have no _______ of what to do next.A. ideaB. planC. mindD. thought102. The students began to _______ preparations for the examination.You have to _______ a lot of reading if you want to improve your English.A. makeB. takeC. getD. do103. Could I have _______ with you, Mr David?She couldn't help crying when _______ came that his cousin had died.A. wordsB. wordC. the wordD. a word104. Shortly after the accident, _______ of police were sent to the spot to keep order. Three hens may lay _______ eggs within a month in spring.A. five dozensB. three score ofC. two hundredD. hundreds105. My bike _______ one hundred dollars.The Great Wall _______ a visit.A. worthsB. is worthyC. is worthD. is worthy of106. Li Ping has _______ in bed for two weeks.The ant queen has _______ lots of eggs.A. liedB. layC. laidD. lain107. I have two other hats _______ this one.Your composition is good _______ some spelling mistakes.A. besideB. besidesC. exceptD. except for108. The old man lives in a _______ village, but he doesn't feel .The sentence "he lives _______" means "he is _______."A. alone; lonelyB. lonely; aloneC. lonely; lonelyD. alone; alone109. What we need _______ is more time.The workers here are _______ young people.A. mostB. in the mostC. mostlyD. at most110. Little Tom was 4 years old, but he could _______ walk without help, his parents were worried.The patient's progress was encouraging as he could _______ get out of bed without help.A. onlyB. nearlyC. hardlyD. lonely111. I think what he spoke at the meeting _______ the attention of all the comrades here. Close attention is being _______ to the present situation in Asia.A. drewB. raisedC. paidD. spent112. I asked him to _______ me a few minutes so that we could go over all the problems. Alice tried hard to _______ every cent for months in order to buy her boyfriend a present.A. shareB. leaveC. spareD. save113. Heat is the _______ of the expansion of matter.Punishment had very little _______ on the naughty children.A. excuseB. reasonC. effectD. cause114. The angry teacher _______ the blackboard with his fist.Suddenly the church clock _______ ten.A. struckB. beatC. hitD. patted115. The soldier _______ his uniform and took his gun, then ran out.The policemen were always _______ in their uniforms in the street.A. put onB. had onC. dressingD. /116. To _______ the truth, I forgot all about your request.Before the meeting, I wanted to _______ the matter over with you.A. sayB. talkC. tellD. remark117. If you _______ the ten figures you will get 100.The lakes _______ the beauty of this city.A. addB. add upC. add toD. add up to118. After supper, Father used to _______ the evening paper.You can _______ his telephone number in the book.A. look atB. look throughC. look upD. look into119. _______ poverty, Della and Jim led a happy life._______ his bad health, he didn't go to save his kidnapped daughter.A. Because ofB. In spite ofC. Instead ofD. In front of120. The owner of the restaurant _______ ten dollars for the meal and went in. The customer, an old man, _______ ten dollars for the meal and went out.A. paidB. tookC. costD. spend121. The young man _______ much money _______ me.The young man _______ me _______ much money.A. robbed; fromB. stole; fromC. robbed; ofD. was stolen; of122. The writer couldn't bear it. He could not _______it.She couldn't _______ the loss of her pupils' respect.A. carryB. sufferC. standD. lift123. _______ your toys, Mary. It's supper time._______ the fire quickly, Jack.A. Put downB. Put awayC. Put outD. Put off124. It all _______ whether the weather would be fine.Some people _______ sports and games only as amusements.A. depended onB. lived onC. carriedD. looked on125. Don't get discouraged by setbacks (挫折), we are new to the work . Children need many things, but _______, they need love.A. after allB. at allC. in allD. above all126. I don't enjoy __________ fun of others.I don't enjoy _________ fun of by others.A. to makeB. to be madeC. makingD. being made127. Something must be done to prevent the river from ______.Something must be done to prevent people from __________ the river.A. polluteB. pollutingC. polluteD. being polluted128. If time _________, I'll go to see my friend tomorrow.Time ________, I'll go to see my friend tomorrow.A. permittedB. permitsC. permittingD. permit129. He has given up ______ us physics because of his illness.What he has given up __________ us physics because of his illness.A. is to teachB. to teachC. teachingD. taught130. The boy who _________ faces now will be punished.The boy ____________ faces now will be punished.A. madeB. to makeC. makingD. is making131. He opened the door and found the snow ______ the hill.He opened the door and found the hill ________ with snow.A. coversB. coverC. coveredD. covering132. He was very busy but she wanted to have him ____________ the clothes. He was so busy that he had to have the clothes _________.A. washingB. washedC. washD. to wash133. Do you know the woman ________ by Jack?Do you know the woman ________ Jack?A. been followedB. followedC. followingD. follows134. He had no choice but ________ aloud the text in the room.He did nothing but _______ aloud the text in the room.A. readingB. to readC. readD. to be reading135. The decision was made _______ soon after the meeting was over.Who was made _______ the decision soon after the meeting was over?A. to knowB. knownC. knowD. knew136. I don't remember _______ such a fellow anywhere before.Do remember _______ your brother at the station?C. meetD. to be met137. Have you considered _______ to Shanghai next month?He is considered ___________ to Shanghai.A. goB. to goC. goingD. to have gone138. I feel like _________ a long walk with you.I'd like _________ a long walk with you.A. takingB. to takeC. takeD. to have taken139. Would you mind my _______ her to the party?Would you mind not ____________ to the party?A. invitingB. to be invitedC. being invitedD. invited140. The wounded needed __________ on at once.The doctor needed _________ on the wounded soldier at once.A. to operateB. operatedC. operatingD. operates141. He did all that he could ________ us with the hard work.He promised that he could _________ us with the hard work.A. helpingB. to helpC. helpD. helped142. He entered the room without _______ his father sitting there.He entered the room without _______ by his father.A. noticingB. noticeC. noticedD. being noticed143. Their work ____________, they went to the cinema.__________ their work, they went to the cinema.A. FinishingB. finishedC. had finishedD. Having finished144. He stood there and his eyes ________ upon the nobleman.He stood there, his eyes _______ upon the nobleman.A. fixB. fixingC. were fixedD. fixed145. He raised his voice in order to make us ______.He raised his voice in order to make himself _______.A. to hearB. hearingC. hearD. heard146. I know what he wants ________ after graduation.I know what he wants ________ my help.A. to beB. beingC. isD. be147. This is an important letter. Don't forget ________ it this afternoon.Don't look for the letter. You must have forgotten ______ it this afternoon.C. postingD. post148. Do you think the film is worth _________ again?Do you think the film is worthy __________ again?A. to seeB. to be seenC. seeingD. being seen149. The day we had looked forward to _______at last.I'm looking forward to ________to your country next year.A. comingB. comeC. cameD. comes150. He regretted _______ her the secret because he shouldn't have done so. He regretted ________ me that he could not do so.A. to be toldB. to tellC. tellingD. being told。

易错易混问题集锦

易错易混问题集锦1．混淆音调和响度日常生活用语里声音的“高”“低”有时指音调，有时指响度，含义不唯一。

但是在这两种情况中所提到的高和低是有本质区别的，如两人争执时，一个人说：你高声嚷什么？这里的“高声”是指声音大、响亮，实质是说响度大；而我们说某演员唱的是花腔女高音，这里的“高音”指的就是音调高，说明这位演员的发声频率高。

但是注意，音调高的声音，响度不一定大，响度大的声音，音调也不一定高。

例如下列四个句子：①这首歌调太高，我唱不上去；②引吭高歌；③她是唱高音的；④请勿高声喧哗。

其中“高”字的含义不同：①中的“高”是指音调高，②中的“高”是指响度大，③中的“高”是指频率高，即音调高，④中的“高”是指声音响度大。

2．误认为“白气”是水蒸气“白气”不是水蒸气，而是水蒸气遇冷液化成的小水珠。

水蒸气与空气一样是无色透明的气体，是看不到的。

大家知道，北方的冬天，人的口中能呼出“白气”，但夏天却不能。

这是因为人呼出的气体中含有大量的水蒸气，在冬天能遇冷液化成小水珠，所以能看到；而夏天温度高，呼出的水蒸气不能遇冷液化，所以看不到。

夏天冰糕冒“白气”是因为空气温度比冰糕温度高，冰糕周围空气中的水蒸气遇到温度较低的冰糕而液化成小水珠。

3．不能正确理解沸腾的条件如图1所示，烧杯甲和试管乙内都装有水，用酒精灯加热烧杯使杯中水沸腾，若不断加热，乙试管中水能否沸腾？很多同学认为乙试管中水能沸腾，这是错误的。

我们知道，热传递要满足一个条件：两个物体温度不同。

而液体沸腾要同时满足两个条件：①使液体温度达到沸点；②液体能继续吸热。

烧杯内的水沸腾时温度保持100℃不变，试管内水到达100℃后就无法再从杯中水吸热，故试管中水能达到100℃，但因为不能继续吸热，所以不能沸腾。

4．搞不清影与像的区别点光源发出的光，照在不透明的物体上时，物体向光的一面被照明，在背光一面的后方形成了一个光照射不到的黑暗区域，这就是物体的影，如图2所示。

可以看出，影子与原物体上下、左右都一致，影子的大小由物体到光源的距离和物体到影幕的距离共同决定。

正反比例易错易混题

X 3
=
y 4
, （x，y均不
为0）则x和y,成( 正 )比例.
(3)若 3
X
=
4 y
,则x和y成( 反 )比例
(4)若x = y+5,则x和y( 不成 )比例
K+3 (5)若 X
=y（K三角形的高一定,它的面积和底 ( A ) A 成正比例 B 成反比例 C 不成比例
选择
甲数和乙数互为倒数, 甲数和乙数( B ) A.成正比例 B.成反比例 C.不成比例
选择
1 a是b的 5 ,那么a与b( A ) A 成正比例 B 成反比例 C 不成比例
正反比例易错易混题
易错易混题（一）
1、瓷砖面积一定, 砖的块数和 (正比例）铺地面积. 2、铺地面积一定,每块砖的面积和所需块数. （反比例）
3、铺地面积一定,方砖边长和所（不成比例）需块数.
易错易混题（二）
1 圆的周长和半径.
2 圆的周长一定，圆周率（不成比例）和直径. 3 圆的面积和半径的平方.
（正比例）
（正比例）
易错易混题（三）
4 正方形的面积和边长.
（不成比例）
5 正方体的体积和它的棱（不成比例）长. 6 正方体一个面的面积和它的表面积. （正比例）
若x和y是两种相关联的量，判断它们是否成比例，成什么比例？
(1)若5x = 4 y,（x，y均不为0）则x和y成( 正 )比例. (2)若

情景交际易错易混点

情景交际易错易混点一、单项选择情景交际1. ------ I'm going to Paris next week.----- ------------------ ! So am IA. Wish you good luckB. What a coincidenceC. Don't mention itD. Good trip【答案】B【解析】【详解】考查情景交际。

句意：一一我下周要去巴黎。

一一太巧了！我也要去。

A. Wish you good luck"祝你好运"；B. What a coincidence“巧合，一致”；C. Don't mention it"不要客气”；D. Good trip 好旅行。

两个人不约而同，要去同一个地方，所以这是一种‘巧合〃。

故选B。

2.—Wow! You look funny in that sweater.— My grandmother gave it to me for Christmas. You know,.A. each bird loves to hear himself singB. beauty is in the eye of the beholderC. it is the thought that countsD. the outsider sees the most of the game【答案】C【解析】【详解】考查谚语。

一一哇！你穿那件毛衣看起来很滑稽。

一一我奶奶送给我的圣诞礼物。

你知道，礼轻情意重，更重要的是心意。

A. each bird loves to hear himself sing孤芳自赏B.beauty is in the eye of the beholder 情人眼里出西施 C. it is the thought that counts礼轻情意重，更重要的是心意D. the outsider sees the most of the game旁观者清。

济南版七年级生物下册易混易错知识点及练习题

济南版七年级生物下册易混易错知识点及练习题济南版七年级生物下册易混易错知识点1.人体含量最多的物质≠有机物：水占人体体重的60%~70%,水属于无机物。

2.脚气病≠脚气：脚气病是缺少维生素B1引起的，脚气是真菌感染引起的，两者病因和症状都不同。

3.坏血病≠败血病：坏血病是缺乏维生素C引起的，败血病是指细菌进入血液循环,并在其中生长繁殖、产生毒素而引起的全身性严重感染。

4.易错字：“小肠皱襞”不要错写成“小肠皱壁”；“膈肌”的“膈”不要错写成“隔”。

5.不要误以为淀粉只在口腔内被分解为麦芽糖：其实大部分淀粉是在小肠内被分解为麦芽糖。

6.不要误认为胆汁是胆囊分泌的：胆汁其实是肝脏分泌的,贮存在胆囊中。

7.不要误认为消化液都含消化酶：胆汁是唯一不含消化酶的消化液，只能对脂肪进行物理性消化。

8.膈肌收缩≠膈上升：膈肌收缩时,膈顶部下降，胸廓的上下径增大;反之，膈肌舒张时，膈顶部上升，胸廓的上下径减少。

9.不要误认为是气体进入导致了胸腔容积增大：肋间肌和膈肌的运动使胸腔容积发生变化,形成肺内与外界的压力差,完成呼吸。

10.不要误认为呼出的气体中二氧化碳比氧气多：无论吸入的气体还是呼出的气体中,都是氧气比二氧化碳多。

11.贫血并不都是红细胞数目过少引发的：血红蛋白含量过少也能引发贫血。

12.不要误认为人体有炎症时白细胞会比红细胞数目多：人体有炎症时，白细胞数目增多，但不会多于红细胞。

13.动脉瓣位于动脉与心室间，不要误认为动脉瓣位于动脉内。

14.与左心室相连的肺静脉有四条血管，不要误认为只要一条血管。

15.不要误认为动脉中流的血都是动脉血,静脉中流的血都是静脉血：如肺动脉内流静脉血,肺静脉内流动脉血。

16.不要误认为体循环在先，肺循环在后：两者不存在时间先后顺序，同时进行。

17.不要误认为冠脉循环是单独的血液循环：冠脉循环是体循环的一部分。

18.不要误认为所有的心血管疾病都能够通过留意糊口体式格局而避免：先本性的心血管疾病即使建立良好的生活惯也不能避免。

高中生物人教版必修一易混易错判断题汇总练习(共200题,附参考答案)

高中生物必修一易混易错判断题班级考号姓名总分一、走近细胞噬菌体可感染肺炎双球菌导致其裂解（）1.T22.T噬菌体的繁殖只在宿主细胞中进行，因为只有核糖体一种细胞器（）23.病毒和大豆叶肉细胞最大的区别是无成形的细胞核（）4.病毒可在人工培养基上大量增殖（）5.池塘中的水、阳光等也是生命系统的一部分（）6.生命系统各结构层次的形成和维持都以细胞为基础（）7.动植物的各种生理活动都以细胞代谢为基础（）8.植物的生长发育以细胞增殖和分化为基础（）9.生物的遗传与变异以细胞内蛋白质的传递和变化为基础（）10.一个池塘中的所有蓝藻是一个种群（）11.某一池塘的全部蓝藻，既不是生命系统结构层次中的种群，也不是群落（）二、元素化合物12.因为C是细胞干重中最多的元素，所以其是最基本的元素（）13.大肠杆菌体内既有DNA，又有RNA，但以DNA作为遗传物质（）14.DNA有氢键，RNA没有氢键（）15.导致萌发的油料种子干重增加的主要元素是C（）16.糖类、脂质、蛋白质和核酸等有机物都是生物大分子（）17.地壳与活细胞中含量最多的元素都是O，因此说明生物界与非生物界具有统一性（）18.细胞中常见的化学元素根据作用的大小分为大量元素和微量元素（）19.病毒的核酸彻底水解后可以得到6种小分子（）20.生物进化是从简单到复杂的，故应该先有的病毒，再有的细胞（）21.Mg是叶绿体中参与光合作用的各种色素的组成元素（）22.胆固醇既是细胞膜的重要组分，又参与血液中脂质的运输（）23.脂质分子中H的相对含量少于糖类，而O的相对含量多于糖类（）24.蛋白质分子中的N主要存在于氨基中，核酸中的N主要存在于碱基中（）25.膜中的磷脂分子是由胆固醇、脂肪酸和磷酸组成的（）26.真核细胞细胞质基质、线粒体基质和叶绿体基质所含核酸的种类相同（）27.糖类是大多数植物体干重中含量最多的化合物（）28.和ATP一样，KH2PO4也能为生物体提供能量（）29.组成人体细胞的主要元素中H的含量最多（）30.C是构成细胞的基本元素，在人体活细胞中含量最多（）31.糖类中的淀粉、纤维素和糖原都完全由葡萄糖缩合而成（）32.淀粉和脂肪水解的终产物是二氧化碳和水（）33.在油料种子萌发初期，脂肪转化为糖类可导致有机物的总量增加（）34.蛋白质变性后还可用双缩脲试剂检测（）35.鸡蛋清中加食盐析出白色絮状物(蛋白质)，兑水稀释后，絮状物消失，蛋白质结构没有发生变化（）36.蛋白质结构之间的差别一定由氨基酸的R基团不同决定（）37.观察DNA和RNA在细胞中分布实验，用高倍显微镜可以比较清楚地看到呈绿色的染色体和呈红色的RNA分子（）38.将抗体溶于NaCl溶液中会造成其生物活性的丧失（）39.高温会破坏蛋白质和核酸分子中肽键（）40.细胞中的无机盐大多数以化合物的形式存在，如CaCO3构成骨骼、牙齿等（）41.蛋白质受高温变性后仍能和双缩脲试剂发生颜色反应（）42.组成细胞的元素大多数以化合物的形式存在（）43.蛋白质在盐析呈絮状物后还可以恢复原有状态（）44.磷脂和核酸都是由C、H、O、N、P五种元素组成（）45.酒精杀菌的原理是破坏细菌蛋白质的肽键，使蛋白质的空间结构发生变化（）46.大肠杆菌细胞中提取到的核酸彻底进行水解，直至形成不能再水解的小分子，则能得到的小分子的种类共有8种（）47.在探究小麦生长发育是否需要Mg2＋的实验中必须设置对照实验（）48.糖类是细胞中主要的能源物质，主要原因是糖类在活细胞中的含量比脂质高（）49.发菜细胞中的DNA主要分布在细胞核，少量分布在细胞质（）三、物质出入细胞50.质壁分离彻底复原后的细胞，将不再吸水，此时细胞液的浓度与外界溶液的浓度相等（）51.农业生产上的松土措施，可以促进植物对无机盐的吸收（）52.质壁分离过程中，细胞液浓度增大，细胞吸水能力减弱（）53.细胞质中的氢离子可以通过扩散作用进入溶酶体内（）54.主动运输使膜内外物质浓度趋于一致，维持了细胞的正常代谢（）55.生理功能不同的人体细胞吸收葡萄糖的方式可能不同（）56.果脯在腌制中慢慢变甜，是细胞主动吸收糖分的结果（）57.以洋葱鳞片叶内表皮为材料不能观察到质壁分离（）58.视野中一个细胞原生质层与细胞壁之间存在较大间隙，说明正在失水（）59.动物细胞不能发生质壁分离但仍存在渗透现象（）60.发生质壁分离过程中，植物细胞的体积在逐渐减小（）61.需要高倍镜才能观察到洋葱鳞片叶外表皮细胞的质壁分离现象（）62.细胞膜两侧的钾离子和钠离子的浓度差是通过协助扩散实现的（）63.神经细胞受到刺激时产生的Na＋内流属于被动运输（）64.动物一氧化碳中毒会降低离子泵跨膜运输离子的速率（）65.α－淀粉酶从糊粉层细胞排到细胞外的方式是逆浓度梯度经协助扩散排出（）66.适应高渗环境的动物可排出体内多余的盐（）67.水从根系向地上部分的运输与细胞壁无关（）四、细胞结构68.生物膜是对生物体内的所有膜结构的统称（）69.植物细胞的边界是细胞壁（）70.核孔是大分子物质如蛋白质、DNA和RNA等物质进出细胞核的孔道（）71.细胞核是遗传信息库，是细胞代谢中心和遗传的控制中心（）72.具有双层膜的细胞器有线粒体、叶绿体和细胞核（）73.健那绿染液染色后的口腔上皮细胞，线粒体为蓝绿色，细胞质接近无色（）74.所有的真核细胞都有细胞核（）75.高倍镜下可以观察到细胞膜清晰的暗－亮－暗三层结构（）76.在电子显微镜下拍摄到的线粒体的结构照片属于物理模型（）77.显微镜的目镜为10×、物镜为10×时，观察到M个分生组织细胞充满整个视野中，若目镜不变，物镜换成40×时，则视野中可观察到分生组织细胞数为M／4个（）78.使用显微镜时，视野中出现一半亮一半暗；观察花生切片标本材料一半时，清晰一半模糊不清，出现上述两种情况的可能原因不同（）79.视野中有异物，转动目镜发现异物不动，移动装片异物也不动，则异物在物镜上（）80.显微镜下观察到一个细胞的细胞质沿逆时针方向流动，则实际的流动方向应为顺时针（）81.若发现视野上方较暗、下方较亮，可以调节反光镜（）82.细胞核是mRNA合成和加工的场所（）83.消化酶、抗体、激素都是分泌蛋白（）84.高尔基体是肽链合成和加工的场所（）85.线粒体将葡萄糖氧化分解成CO2和H2O（）86.溶酶体合成和分泌多种酸性水解酶（）87.细胞核中可进行遗传物质的复制和转录、翻译（）88.高尔基体与分泌蛋白的合成、加工、包装和膜泡运输紧密相关（）89.囊泡运输依赖膜的流动性且不消耗能量（）90.细胞膜的完整性可用台盼蓝染色法进行检测（）91.提取原核细胞的脂质平铺于水面测出的面积约是原核细胞表面积的2倍（）92.线粒体、核糖体、酶等结构或物质的组成中，一定不含有核糖的是酶（）93.研究一个新发现的细胞，含有内质网，即可认定该细胞一定为真核细胞（）94.细胞核是遗传信息转录和翻译的场所（）95.核孔不具有选择透过性，RNA和蛋白质可以自由出入（）96.染色体的成分只含有DNA和蛋白质（）97.核糖体的形成均与核仁有关（）98.不同细胞中核膜上的核孔数量不同，具体数量与细胞代谢旺盛程度有关（）99.细胞间的信息交流大多与细胞膜的结构和功能有关（）100.细胞“骨架”由蛋白质纤维和脂质组成，与细胞的运动、分裂等有关（）101.细胞核是细胞代谢的控制中心，但不是细胞代谢的场所（）102.制作口腔上皮细胞装片时为防止产生气泡，首先在载玻片上滴加1～2滴清水，然后再盖上盖玻片（）103.性激素主要是由内质网上的核糖体合成（）104.植物细胞的原生质层包括细胞膜、细胞质和细胞核（）105.罗伯特森利用光学显微镜观察细胞膜呈现“亮一暗一亮”实质是“脂质一蛋白质一脂质”（）106.利用放射性同位素标记法将小鼠和人细胞膜上的蛋白质分子做标记的实验，证明了细胞膜具有一定的流动性（）107.欧文顿利用”相似相溶原理”解释了脂溶性物质容易进入细胞的原因是细胞膜上具有大量的磷脂和蛋白质（）108.蓝藻和绿藻都能够进行光合作用，所以都含有叶绿体（）109.溶菌酶能破坏酵母菌和乳酸菌的细胞壁（）110.叶片表皮细胞的表面有角质层，具有保护作用（）111.用高倍镜观察叶绿体实验中，取菠菜下表皮稍带些叶肉细胞，观察效果较好，直接取叶片下表皮也可以观察（）112.真核细胞中蛋白质合成后均需要内质网、高尔基体加工（）113.细胞核是细胞代谢的主要场所（）114.成人心肌细胞中的线粒体数量比腹肌细胞的多（）115.线粒体外膜上的蛋白质含量比内膜的高（）五、酶与代谢116.探究不同温度下淀粉酶的活性可选用碘液进行检测（）117.探究pH对酶活性的影响，可选择可溶性淀粉溶液作为底物（）118.温度对淀粉酶活性的影响可选择斐林试剂对实验结果进行检测（）119.用淀粉、蔗糖和淀粉酶来探究酶的专一性，可用碘液对实验结果进行检测（）120.若要验证淀粉酶的专一性，底物可选择淀粉和蔗糖。

二年级易错易混测试卷【含答案】

二年级易错易混测试卷【含答案】专业课原理概述部分二年级易错易混测试卷一、选择题（每题1分，共5分）1. 下列哪种情况会导致电路中的电流增大？A. 电压不变，电阻减小B. 电压不变，电阻增大C. 电阻不变，电压减小D. 电阻不变，电压增大2. 在化学反应中，下列哪种物质被称为催化剂？A. 反应物B. 物C. 中间产物D. 参与反应但不改变反应物和物的物质3. 下列哪种动物属于哺乳动物？A. 鸟类B. 鱼类C. 爬行动物D. 哺乳动物4. 下列哪种现象属于物理变化？A. 燃烧B. 腐烂C. 蒸发D. 酸碱中和5. 下列哪种物质在常温下是固体？A. 水银B. 酒精C. 水晶D. 液氧二、判断题（每题1分，共5分）1. 长度单位“米”是国际单位制的基本单位。

（）2. 碱性物质可以中和酸性物质。

（）3. 地球是太阳系中的第五颗行星。

（）4. 植物通过光合作用可以产生氧气。

（）5. 人类的大脑是人体最重要的器官。

（）三、填空题（每题1分，共5分）1. 光的传播速度在真空中是______。

2. 地球上的水循环包括蒸发、降水、______和径流。

3. 人体所需的六大营养素包括蛋白质、脂肪、碳水化合物、维生素、矿物质和______。

4. 在化学反应中，反应物和物的质量总和称为______。

5. 电流的方向是由正电荷向负电荷流动的，这个规定是由______提出的。

四、简答题（每题2分，共10分）1. 简述牛顿第一定律的内容。

2. 什么是生态平衡？为什么生态平衡对生物多样性的保护很重要？3. 简述地球自转和公转的方向。

4. 请解释相对湿度的概念。

5. 请简述光合作用的过程。

五、应用题（每题2分，共10分）1. 一个电阻器的电阻值为10Ω，通过它的电流为0.5A，求电阻器两端的电压。

2. 一个化学反应的化学方程式为2H2 + O2 → 2H2O，求1摩尔水所需的氢气和氧气的摩尔数。

3. 一个物体的质量为2kg，受到一个水平方向的力10N，求物体的加速度。

易错易混钠与氧气、水和水溶液反应的规律-高一化学易混易错归纳与专练(解析版)

高一化学易混易错归纳与专练易错易混09 钠与氧气、水和水溶液反应的规律易错点一忽视钠与氧气在不同条件下的反应不同【易错典例】例1 金属钠是一种活泼金属，除了具有金属的一般性质外，还具有自己的特性。

下列关于钠的叙述中，正确的是A．钠是银白色金属，熔点低，硬度大B．钠放置在空气中，会迅速被氧化而生成淡黄色的氧化钠C．在氧气中加热时，金属钠剧烈燃烧，发出黄色火焰D．金属钠着火可以用泡沫灭火器或用干燥的沙土灭火【答案】C【解析】A中，钠的硬度小，可用小刀切割；B中，放置在空气中，钠被缓慢氧化生成白色Na2O；D中，钠着火时生成Na2O2，泡沫灭火器释放的泡沫中有CO2、H2O会与Na和Na2O2反应生成H2、O2，故不能用泡沫灭火器灭火。

【解题必备】钠与氧气的反应1．钠的性质及其保存钠是一种硬度小、熔点低的银白色的金属，具有金属光泽。

常温下极易被氧化，加热时可燃烧生成淡黄色的Na2O2。

因为钠在空气中极易被氧化，实验室保存钠时应与空气隔绝，通常保存在煤油中。

2．钠在常温下与氧气反应的化学方程式是4Na+O2===2Na2O，在加热或点燃时反应的化学方程式是2Na+O2 Na2O2。

由此得出的结论是反应条件不同，其产物不同。

【变式体验】等质量的两块钠，第一块钠在足量氧气中加热，第二块钠放置在空气中，待反应完全后，下列说法正确的是()A．第一块钠失去的电子多B．两块钠失去的电子一样多C．第二块钠的生成物质量较大D．两块钠的生成物质量一样大【答案】B【解析】A．钠与氧气反应，常温下生成氧化钠，加热时生成过氧化钠，两种情况钠都是从0价升高到＋1价，只要钠的量相等，失去的电子数目一定相等，A错误；B．钠的量相等，失去的电子数目一定相等，B正确；C．钠的量相等，失去的电子数目一定相等，因为钠的质量相同，生成过氧化钠和氧化钠的物质的量相同，但等量的钠在这两种情况下结合的氧不一样多，加热时生成的过氧化钠质量较大，C错误；D．等量的钠在这两种情况下结合的氧不一样多，加热时生成的过氧化钠质量较大，D错误；答案选B。