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【中考考点易错题】2021年初三考点错题集

【中考考点易错题】2021年初三考点错题集

初三错题集第一部分:初三错题集(本部分72道题,满分72分)1、Thank you for ____ me ___ some water.()A、helping;carryB、help;carryingC、helps;to carryD、helping;carried2、He was busy ___ his homework.After a short rest,he went on ___ it.3、If you don't know the m____ of the new words,you can look them up in a dictionary.4、The criminal should be ____ for what he did.()A、hangB、hungedC、hungD、hanged5、Could you please give us some ___ advise on how to improve English?()A、detailsB、detailedC、detailD、detailing6、I love geography and I never get ___ reading geography magazines.()A、excitedB、excitingC、boredD、boring7、___ no one knows the truth,we don't believe what he said.()A、WhetherB、WhenC、WhileD、Since8、The pizza looks ___.It's my favourite.()A、healthyB、lovelyC、deliciouslyD、sweetly9、But ___ has done a lot to help people.()A、sheB、herC、hersD、herself10、The cat had a broken leg and walked with great p___.11、He practises w____ an article every day.12、After the terrible car accident,Jack became d_____.13、I don't want to ___ her advice because I think it is useless.You are right.I ___ think so.()A、accept;alsoB、receive;alsoC、accept;tooD、receive;too14、--She ____ herself in the accident.--Really.Do I need _____her ?()A、touched;visitB、hurt;visitC、touched;to visitD、hurt;to visit15、Tiim used to ___ sports until he hurt his legs in an accident.()A、loveB、lovesC、lovingD、loved16、Daisy is such a good daughter that she ____ most of her spare time with her parents.()A、spendsB、costsC、takesD、affords17、Do you know that the Earth is home to ___ animals?()A、millionB、millions ofC、millionsD、million of18、单词拼写:She is s___ to pass the exam because she studies well all the time.19、I will tell you about this thing ___.()A、lateB、beforeC、laterD、latest20、We must do everything we can ____ waste water from running into rivers.()A、keepB、keptC、to keepD、keeping21、___ more about tomorrow's weather,call 121.()A、KnowB、KnowingC、To knowD、Known22、There is't any difference between the two.I really don't know _____.()A、where to chooseB、which to chooseC、to choose whatD、to choose which23、Your coat looks nice.Is it ____ cotton?()A、made inB、made fromC、made ofD、made for24、完成句子:老师教学生们怎样做好准备比赛。

初中九年级物理高频错题集

初中九年级物理高频错题集

九年级物理高频错题集1.【题文】一根纱线容易拉断,一根铜丝不容易拉断,这个现象说明了A.纱线内分子不存在引力,铜丝分子间只有引力B.纱线内分子间只存在斥力,铜丝分子间不存在斥力C.纱线内分子间的引力比斥力小,铜丝分子间引力比斥力大D.纱线内分子间相互作用力比铜丝间相互作用力小2.【题文】关于物质的组成,下列说法错误的是A.物质是由分子组成的B.原子由原子核和中子组成C.原子核由质子和中子组成D.质子和中子还有更小的精细结构3.【题文】关于分子动理论,下列说法中不正确的是A.物质是由大量分子组成的B.温度越高,分子的运动越剧烈C.分子是组成物质的最小微粒D.固体很难被压缩,说明分子间存在斥力4.【题文】小明在广口瓶内装入一些细沙,用带孔的软木塞堵住瓶口,并在木塞的小孔中插入一支温度计,如图所示,然后用干燥的厚棉布裹住广口瓶,用力迅速上下摇动瓶内细沙。

下列说法中正确的是A.小明会观察到温度计的示数不变B.这一实验证明了做功可以改变物体的内能C.这一实验证明了热传递可以改变物体的内能D.用干燥的厚棉布裹住广口瓶的目的是防止掌心和瓶内的相互传热5.【题文】关于温度、热量和内能,下列说法正确的是A.物体的内能增加,温度一定升高B.物体温度升高,一定吸收了热量C.物体温度降低,内能一定减少D.物体吸收了热量,温度一定升高6.【题文】有甲、乙、丙、丁四个轻质小球,乙带正电,把四个小球分别两两靠近时,发现乙吸引甲,丙吸引乙,丁吸引丙也吸引甲,则丁球的带电情况是A.可能带负电,也可能不带电B.可能带正电,也可能不带电C.不带电D.可能带负电,可能带正电,也可能不带电7.【题文】如图所示用被丝绸摩擦过的玻璃棒接触验电器的金属球,发现验电器的两个金属箔张开,对这一现象理解正确的是A.金属箔因带负电荷相互排斥而张开B.金属箔因带正电荷相互排斥而张开C.金属箔因带异种电荷相互排斥而张开D.无法确定金属箔带电情况用如图所示电路研究电流跟电压的关系。

初三错题集——精选推荐

初三错题集——精选推荐

错题集( ) 1. There are a lot of _____ in our school. They work very well.A. man teachersB. men teachersC. men teacher( ) 2. Lily as well as Lucy _____ to school on foot.A. goB. goesC. who go( ) 3. Either Mike or his classmates _____ in the classroom.A. isB. areC. was( ) 4. Can you imagine what he will be like in _____ time?A. ten yearsB. ten year’sC. ten-year’s( ) 5. They told us that their next match was against _____ team from another.A. a boy’sB. the boy’sC. the boys’( ) 6. The police _____ having a meeting now.A. isB. areC. were( ) 7. _____ Greens were having dinner when the phone rang.A. AB. /C. The( ) 8. He’s a doctor, he works in _____ hospital.A. aB. /C. the( ) 9. Can you give me _____ eighth cake? I’m very hungry.A. aB. anC. the( ) 10. The young _____ interested in action movies.A. isB. areC. was( ) 11. Tom, look at the man in black over there. Can you tell me _____? ---He’s an engineer.A. who is heB. who he isC. what is heD. what he is( ) 12. The young lady _____ is a friend of my sister’s.A. who I had a talkB. whom I had a talk withC. whom I had a talkD. which I had a talk with( ) 13. Please do that _____ he told you.A. asB. /C. untilD. because( ) 14. I’m new here. Could you tell me _____, please?A. where the first bus arriveB. when the first bus arrivesC. when will the first bus arriveD. when did the first bus arrive( ) 15. As soon as he comes back, I’ll tell him when _____ and see him.A. you will comeB. will you comeC. you come( ) 16. I don’t know _____.A. what has happened to himB. what happened to himC. which happened to himD. what had happened to him( ) 17. I won’t leave my office until my work _____.A. finishB. will finishC. is finishD. was finish( ) 18. Mary has received several letters from her hometown since she ____ to the city.A. cameB. comesC. has comeD. had came( ) 19. A lot of children have to wear glasses _____.A. as they watch TV too muchB. though they like reading in bed.C. so they play too many computer games( ) 20. No matter _____ busy he is, he spends sometime playing with his children.A. whatB. whenC. howD. where( ) 21. ---Will you go to the dinner party? ---I won’t go unless Tom _____.A. is invitedB. will be invitedC. was invited( ) 22. The People’s Republic of China _____ on October 1st, 1949.A. foundB. was foundC. is foundedD. was founded( ) 23. ---The sport shoes must be Mike’s.---No, they ____ be. They are too small for him.A. mustn’tB. can’tC. may notD. might not( ) 24. He doesn’t play the piano so _____ as his sister.A. goodB. betterC. wellD. best( ) 25.--- Don’t forget to turn off the lights if you are the last one to leave. ----_____.A. Me eitherB. I won’tC. Me too C. I will( ) 26. Y ou can’t sneeze and keep your eyes ____ at the same time.A. openB. opensC. openedD. opening( ) 27.--- Have you found the information about that famous writer ____ you can used for the report?----Not yet. I’ll search some on the Internet.A. whoB. whatC. whomD. which( ) 28.( )( )( )( )( )( )( )( )( )( )( )( )( )( )。

九年级物理错题集

九年级物理错题集

九年级物理错题集1.下列估算合理的是:()A.一只咸鸭蛋的质量约为600g B.一张报纸的厚度约为75nmC.一名中学生1s心跳约为70次D.一盏教室内的日光灯正常工作时的功率约为40W2.小明游览一座古寺时发现里面有一个变音钟,随着钟下燃烧的香火越旺,敲出的声音越高亢原因的可能是()A.香火使钟周围的空气温度升高,传声效果越来越好B.任何物体温度升高时,振动发出的声音音调都会变高C.香火使振动的振幅加大,使声音响度变大D.香火使钟的温度升高。

材料的微观结构发生变化,钟振动频率改变3.把一块-6℃的冰投入0℃的水里,周围气温也是0℃,过一段时间,则()A、水肯定减小,冰肯定增加B、水可能减小,冰可能增加C、水肯定增加,冰肯定减小D、水可能增加,冰可能减小4.将一物块放在盛满水的杯中静止时,溢出水的质量是27g,当把它放在盛满酒精的杯中静止时,溢出的酒精质量是24g,则物块在水中的状态和密度为(ρ酒精=0.8×103kg/m3)()A.沉底,ρ=1.25×103kg/m3B.漂浮,ρ=0.9×103 kg/m3C.漂浮,ρ=0.8×103 kg/m3 D.悬浮,ρ=1.0×103 kg/m35.将甲、乙两砝码以细线相连并跨过定滑轮,使两砝码距离地面相同高度,如图1所示.当由静止自由释放后,甲砝码下降,乙砝码上升,如图2,假设细线及定滑轮的重量不计,且细线与定滑轮间无摩擦力,在砝码运动的过程中,下列推论何者最适当()A.甲的动能增加,乙的重力势能减少B.甲的动能减少,乙的重力势能增加C.甲的动能增加,乙的重力势能增加D.甲的动能减少,乙的重力势能减少第5题图第6题图第7题图6.如图所示,在竖直平面内用轻质细线悬挂一个小球,将小球拉至A点,使细线处于拉直状态,由静止开始释放小球,不计摩擦,小球可在A、B两点间来回摆动.当小球摆到B点时,细线恰好断开,则小球将()A.在B点保持静止B.沿BE方向运动C.沿BC方向运动D.沿BD方向运动7.如图所示是电阻甲和乙的U-I图象,下列说法正确的是()A.甲的电阻值保持10Ω不变B.乙的电阻值保持20Ω不变C.甲、乙并联在电路中,当电源电压为2V时,电路总电流为0.3AD.甲、乙串联在电路中,当电路电流为0.2A时,甲的功率为0.6W8.如图所示是汽车、摩托车油量表(实际上是电流表)原理示意图,R'是定值电阻,R是滑动变阻器,则A.向油箱里加油时,电流表示数变大B.燃油消耗下降时,电流表示数变大()C.燃油全部耗尽时,电流表将被烧坏D.油箱加油过满时,电流表将被烧坏第8题图第9题图第10题图9.李明同学为了探究“电功率与电阻的关系”,他找来额定电压均为6V的L1、L2两只灯泡.将两灯串联起来,按照如图所示的电路开始了实验探究,闭合开关后,看见灯L2微微发光,灯L1几乎不发光,则关于两灯的电阻R1和R2、两灯的额定功率P1和P2的大小关系成立的是(不考虑灯丝电阻值随温度的变化)()A.R1>R2,P1>P2 B.R1<R2,P1<P2 C.R1>R2,P1<P2 D.R1<R2,P1>P210.如图,是检查视力时平面镜、被测者和视力表的位置关系示意图.若平面镜距视力表3m远,该视力表要求被测者在5m远处,则人应坐在离视力表m远处,视力表上其中一个“E”字开口指向纸外,则被测者应向她的(选填“上方”、“下方”、“左方”或“右方”)指才正确.11.对物体的长度进行了四次测量,结果分别为:19.20厘米、20.22厘米、19.19厘米、19.21厘米,则这个物体的长度的应该记为厘米12.如图所示,气泡从充满油的玻璃管底端向上运动,点B、C、D是每隔2 s记录的气泡位置.则气泡在BC段的平均速度为m/s,在AD段做(匀速/变速)直线运动.第12题图第14题图第15题图13.体积为0.5 m3的钢瓶内装有密度为6 kg/m3的氧气,某次电焊中用去了其中1/3,则钢瓶内剩余氧气的质量为________ kg,剩余氧气的密度为________ kg/m3.14.将一袋大米放在匀速向右运动的输送带上,开始米袋与输送带间有一段距离的相对滑动,然后米袋随输送带一起匀速运动.当输送带突然制动时,米袋会继续向前滑动一段距离后停下.(回答下列小题请选填以下合适的字母标号)A.受到方向向右的摩擦力;B.受到方向向左的摩擦力;C.不受力(1)米袋刚放上输送带的瞬间,米袋在水平方向上受力情况为;(2)当米袋随输送带一起匀速运动时,米袋在水平方向上受力情况为;(3)当将输送带突然制动时,米袋在水平方向上受力情况为.15.2012年1月14日早上,某市市区长江路32号附近路面发生一起交通事故,两部同向行驶的汽车发生“追尾”.汽车B刹车后由于仍撞到汽车A;观察汽车A的尾部向上翘起,说明力能够改变物体的;此时对汽车A中的司机起保护作用的是(选填“安全气囊”或“汽车头枕”).16.如图所示,A、B为两个等高圆柱形容器,容器内部的底面积之比为2∶1,两个容器都装满水.现将质量之比为1∶3的木块分别轻轻放入A、B两容器中,则水对容器底部的压强之比为________,水对容器底部的压力之比为________.第16题图第18题图第19题图17.小华质量为50kg,每只脚与地面的接触面积为200cm2,他双脚站立时对水平地面的压强为_______Pa,他走路时对水平地面的压强会______.(选填“变大”、“变小”或“不变”)。

九年级物理错题集解析

九年级物理错题集解析

九年级物理错题集解析一、热学部分。

1. (关于比热容概念理解错误)- 题目:质量相同的甲、乙两种物质,吸收相同的热量后,甲升高的温度比乙大,则甲的比热容____乙的比热容(填“大于”“小于”或“等于”)。

- 错误答案:大于。

- 解析:根据比热容的计算公式Q = cmΔ T,当Q和m相同时,Δ T与c成反比。

因为甲升高的温度比乙大,所以甲的比热容小于乙的比热容。

2. (热量计算错误)- 题目:把质量为2kg、温度为30°C的铝块加热到100°C,铝块吸收的热量是多少?(铝的比热容c = 0.88×10^3J/(kg·^∘C))- 错误答案:Q=cmΔ T = 0.88×10^3J/(kg·^∘C)×2kg×(30^∘C - 100^∘C)(这里Δ T计算错误)- 解析:Δ T=T_末-T_初=100^∘C - 30^∘C = 70^∘C,则Q = cmΔT=0.88×10^3J/(kg·^∘C)×2kg×70^∘C = 1.232×10^5J3. (物态变化中的热量计算错误)- 题目:100g的冰熔化成水,需要吸收多少热量?(冰的熔化热为3.36×10^5J/kg)- 错误答案:Q = cmΔ T(错误地使用了比热容公式,这里是熔化过程,应使用熔化热公式)- 解析:m = 100g=0.1kg,Q = mL=0.1kg×3.36×10^5J/kg = 3.36×10^4J4. (对热机效率概念理解错误)- 题目:某热机做有用功是100J,燃料完全燃烧放出的热量是500J,该热机的效率是多少?- 错误答案:eta=frac{Q_放}{Q_有}(公式用反了)- 解析:热机效率eta=frac{Q_有}{Q_放}×100%=(100J)/(500J)×100% = 20%5. (对改变内能的方式判断错误)- 题目:冬天搓手取暖是通过____方式改变内能的。

中考数学错题小集整理

中考数学错题小集整理

错题小集整理(一)1、二次函数c bx x y ++-=2,若1=+c b ,则它的图像一定过点 。

2、如图,点A 是双曲线xy 4=在第一象限上的一动点,连接AO 并延长交另一分支于点B ,以AB 为斜边作等腰Rt △ABC ,点C 在第二象限,随着点A 的运动,点C 的位置也不断变化,但始终在一个函数图像上运动,则这个函数的解析式是 。

3、如图,在△ABC 中,4AB =5AC ,AD 是△BAC 的角平分线,点H 在线段AC 上,且CH =2AH ,E 为BC 延长线上一点,连接EH 并延长AD 于点G ,使EG =ED ,过点E 作EF ⊥AD 于点F ,则AG:FG = 。

4、某会标图案是由四个全等的直角三角形围成的一个大正方形,中间的阴影部分是一个小正方形的“赵爽弦图”。

若这四个全等的直角三角形有一个角为30°,顶点B 1、B 2、B 3、……、B n 和C 1、C 2、C 3、……、C n 分别在直线1321++-=x y 和x 周上,则第n 个阴影正方形的面积为 。

5、关于x 的方程()011222=-+--m x m x 的两个实数根为1x 、2x ,且32221=+x x ,则m= 。

6、一次函数b kx y +=,当1≤x ≤4时,3≤y ≤6,则kb的值为 。

7、如图,已知点A 是第一象限内横坐标为32的一个定点,AC ⊥x 轴于点M ,交直线x y -=于点N 。

若点P 是线段ON 上的一个动点,∠APB =30°,BA ⊥PA ,则点P 在线段ON 上运动时,A 点不变,B 点随之运动。

求当点P 从点O 运动到点N 时,点B 运动的路径长是 。

8、有一种螃蟹,从海上捕获后不放养,最多只能存活两天,如果放养在塘内,可以延长存活时间,但每天也有一定数量的蟹死去,假设放养期内蟹的个体质量基本保持不变,现有一经销商,按市场价收购这种活蟹1 000 kg 放养在塘内,此时市场价为每千克30元,据测算,此后每千克活蟹的市场价每天可上升1元,但是,放养一天需支出各种费用为400元,且平均每天还有10 kg 蟹死去,假定死蟹均于当天全部销售出,售价都是每千克20元。

九年级英语错题集

九年级英语错题集

初三典型错题1.--The Mars-500 test will take about 520 days. ---____. I hope it goes well. A.It's a pleasure. B Good luck C.That's OK. D.Congratulations2.---Thanks for your help. ---_______. A.No,thanks. B Let me seeC It doesn't matter.D That's OK.3The shop ____at 8:00a.m. And it ____ for ten hours every day.A opened opensB is openedC has openedD opens ,is open4,If people ____cutting down the forest, they will have nowhere ___.A keep to live in B will keep to live in C keep to live5.The car accident happened _____ a cold winter morning. Luckily, no one was hurt. A in B on C at D of6.--Hello! Golden sun Hotel. Can I help you?----Do you have a room_____ for this weekend?A availableB useful c empty D possible7.There are only _____new words in the passage, but I know ___of them. A some all B a few noneC lots ofD few none8.-----Have you got any plan for National Day? ---Well,___October1st,I plan to go shopping with my cousin.A inB onC atD for9.No wonder this room looks larger .Some furniture ____ to the next room. A move B movedC has movedD has been moved10.----Have you decided where to go for our holiday , Dad?-----What about the island _____ we spend last summer holiday?A whichB whereC whenD that11."But we are real gentlemen! ____ could a real gentlemen do such a thing?" the teacher said angrily. A where B what C how D why12.------_____leave here right now,will you ?-----OK, we'll stay here _____it ____raining.A Not; though....stopsB don't; until ....stopsC Let us; if ...stoppedD Let's ;since...stopped13.-----Teachers often tell us _____ pens in class. ----I think we should be_____to listen to them.A.not to play; careful enough B not to play with ; careful enough C.to not play; enough carefully D to not play with; enough carefully14.The first step is to think of the words that you use daily, simple everyday words ___book or shoe or tree. A in B about C like D from15.Listen first and don't care too much about _____you fully understand what you're hearing.Try to repeat what you hearing. A which B whether c how D why16.---Will you make ______for the old lady? ---Sure .Just_____my seat.A room ; takeB a room ;liveC room; sitD rooms; sit17.----He ate little this morning, ______? --------yes,he did. A didn't B did C was D wasn't18.----Could you please help me to move the heavy desk away? ---__________.A my favouriteB With pleasureC You are rightD My pleasure19.---Sorry,Mr.White, Joe can't take part in the relay race because he's ill.----It doesn't matter.I'll ask _____ to go instead of him.A everybody elseB anybody elseC somebody elseD nobody else20.____ a need for us to discuss the problem again since it has been settled.A It hasB There hasC It isD There is21.----__________I return the Mp3 players to you today,Linda?------No,you_________.Tomorrow is OK.A Shall can'tB Will ;can'tC Must ; needn'tD Can Mustn't22.---Have you seen James these days?-----He_______goes out these days because he is busy _____ his homework.A, hardly ever; in B hardly ever; doing C hardly never; with D hardly ever; to do23.Near our school there are two ________.A shoe's shopsB shoes shopsC shoe shopsD shoes' shops24.---Could you tell me ______you'll be away? -------About three weeks.A how away B.how farB how long D how soon25.----What would you do ______the lost library book? -----I would try to find it or pay ______it.A for ; toB about; forC with toD with ;for26.When_____ your mother ______you that blue dress,Mary? ----Sorry, I really can't remember.A.does; buy B has ;bought C had; bought D did ;buy27.----peter,I think we need to buy a new car. -----______ of them,I like water-skiing best.A NeitherB NoneC AllD Either28.-----Hurry up,Jack! -----Just give me five minutes to put my desk in _______.A timeB lineC orderD shape29.----Haven't you forgotten _______? ------_______? Oh.I forgot my bag.A anything; Excuse meB something;Excuse meC something: Pardon D.everything;Pardon30.-----How much ______the pair of shoes? ---Twenty dollars ______enough.A is ;isB are ;isC are ; areD is are31.---There ______ a tiger and two chimpanzees in the zoo.Let's go there this weekend.A isB areC hasD have32.Each of us has to write a _________report every two weeks.A two-hundred-wordB two-hundreds-wordC two-hundreds -wordsD two hundred-words33.What a pity! Liu Xiang didn't win the _______hurdles .A two-hundred-wordB two-hundreds-wordC two-hundreds-wordsD two-hundred-words34._____of the land in that district _____covered with trees and grasses.A Two fifths ;isB two fifth areC Two fifths areD two fifth is35.Now,everybody,please turn to Page____ and look at the _____picture.A Fifth; fiveB fifth; fiveC Five ;fiveD Fifth ;fifth36.----Whose bike is this? --It ______-belong to Adam,Look!His bag is on it.A mustB mayC willD can37.----May we leave the classroom now? -----No,you _____.You ______to leave until the rings.A mustn't ; are allowedB don't have to; are supposedC needn't ; aren't allowedD can't ;aren't supposed38.You are allowed to play football in the yard ,but you ____break anything.A.might not B needn't C may not D mustn't39.--It's such a long way! What shall I do? --You ____take my car if you want.A willB mustC mayD shall40.I must do everything we can _____waste water from running into rivers.A keepB keptC to keepD keeping41.We have ____up early in order to catch the early bus.A used to getB been used to getC used for gettingD been used to getting42.---Why did you buy a radio? ----______English.A LearnB learningC To learnD Be learning43.---What are on show in the museum ? ----Some photos ____by the children of Yushu,Qinghai.A have been takenB were takenC are takenD taken44.Necessary action ______ so that students can be safe at schools.A can be takenB must be takenC may be takenD might be taken45.Are you going to the party _______at Smith's home this evening? -----I will if I am free.A.holding B held C to hold D to be held46.------It's difficult for the village children to cross the river for school.I think a bridge _____over the river.A was builtB is being builtC has been builtD should be built47._____ hard and you'll make progress in English.A WorkB To workC WorkingD Worked48.People in English---speaking countries usually ____"Take care" to their family members or friends when they leave. A say B speak C tell D talk49.The plane will _____from Beijing Captain Airport and land in London.A. take up B take out C take away D Take off50.----Millions of people know about Susan Boyle now,______?-------,she becomes well-known because of her success on Britain's Got Talent.A do they ; NoB do they; YesC don't they YesD don't they No51.Just like weather, life _______be beautiful all the time.A mustn'tB needn'tC can'tD wouldn't52.If people ____cutting down the forest, they will have nowhere ______.A keep ;to live inB will keep ; to live inC keep ; to liveD will keep; to live53.----How long have you _____?----Since 1990.A bought the MP3B joined the armyC become a midfield playerD lived in the town.54.---Dear,What time is the flight to Beijing on Saturday? -----Wait a minute. Let me _____in the schedule.A look at itB look for itC look after itD look it up55 There _______many students in the library after school every day.A hasB haveC isD are56.Tom's mother asked him ________ some washing after dinner.A to doB doesC doD did57.----Long time no see! ----Oh,It ______like years since I last saw you.A looksB seemsC feelsD sounds58.Remember to spend some time ______ your loved ones,because they're not going to be around forever. A from B with C in D on59.Mr. Black is strong _____ keeping animals in the zoo,because he thinks animals should also have the right to enjoy freedom. A up B for C again D down60. Every one of you is looking forward ___ getting a good result, Better think carefully before writing down your answers. Wish you success! A on B in C to D up61.____ the age of 13, Fu Mingxia was very famous in china _____ the youngest Olympic champion. A At ; for B At ; as C on; for D In ; as62.She is going to get married ____ John on New Year"y Day. They are _____their twenties.A to ; inB with ; inC to ;atD with ;at63.-----How is it going? -----Thanks ____ the weather, the crops grow well.A toB forC a lotD of64 Oh,it's you,Ella! Your voice sounds very different ___the phone.What's happening?A fromB inC ofD on65.----I hear you got a ticket ________ the Opening Ceremony of the Beijing Olympics.------Yes.I got it ______my uncle. A of ;from B to ;by C to ;from D for;to66.Reading ______the sun isn't good _____you.A under; forB in ;forC in ;toD under; at67.Don't worry sir. I'm sure I can run ____ to catch up with them.A fast enoughB enough fastC slowly enoughD enough slowly68You will realize the importance of mastering a foreign language _____in the future.A some timeB some timesC hardlyD sometime69They all looked ______at the teacher and felt quite _______.A sad ;sadB sadly;sadlyC sadly ;sadD sad ;sadly70.----Emily, here's a dictionary.I hope it will help you. -----Thank you, It's ____what I need.A justB stillC onlyD almost71.Linda has ______been to Disneyland, has she? A too B neither C either D also72.David jumped ____in the long jump. He won the game!A longestB farthestC fastestD highest73----Why would some workers in Foxconn die ___continue working in the factory?-----Psychologists say they are under too much pressure.A better thanB by accidentC instead ofD rather than74.---Did you find the small village yesterday?------ Yes,without any difficulty,for it has ______changed over year.A hardlyB greatlyC clearlyD nearly75.----It seems that Alice never wants to do anything except draw pictures.------Right.That's what she likes to do ______.A ,more B less C most D least76 I don't know what her interests are,because we talk _____ about work when we meet.A LuckilyB safelyC mainlyD clealy77Dear students ,please read every sentence carefully. ______you are ,____mistakes you'll make.A The more carefully; the fewerB The more careful; the fewerC The more careful ; less DThe more carefully; the less78.Mr Brown always makes his class _____ and keeps his students _____ in class.A alive ;interestingB lively interestedC alive interestedD lively interesting88The coffee is good, but it will taste ______with some milk.A goodB betterC bestD the best89 The living-room is sixes and sevens. (同意句)————————————————90.After a white ,the baby started crying. (同意句)————————————————。

中考数学易错题集锦及答案 [整理版]

中考数学易错题集锦及答案 [整理版]

初中数学选择、填空、简答题易错题集锦及答案一、选择题1、A 、B 是数轴上原点两旁的点,则它们表示的两个有理数是( )A 、互为相反数B 、绝对值相等C 、是符号不同的数D 、都是负数 2、有理数a 、b 在数轴上的位置如图所示,则化简|a-b|-|a+b|的结果是( ) A 、2a B 、2b C 、2a-2b D 、2a+b3、轮船顺流航行时m 千米/小时,逆流航行时(m-6)千米/小时,则水流速度( )A 、2千米/小时B 、3千米/小时C 、6千米/小时D 、不能确定 4、方程2x+3y=20的正整数解有( ) A 、1个 B 、3个 C 、4个 D 、无数个 5、下列说法错误的是( )A 、两点确定一条直线B 、线段是直线的一部分C 、一条直线是一个平角D 、把线段向两边延长即是直线 6、函数y=(m 2-1)x 2-(3m-1)x+2的图象与x 轴的交点情况是 ( ) A 、当m ≠3时,有一个交点 B 、1±≠m 时,有两个交 C 、当1±=m 时,有一个交点 D 、不论m 为何值,均无交点7、如果两圆的半径分别为R 和r (R>r ),圆心距为d ,且(d-r)2=R 2,则两圆的位置关系是( ) A 、内切 B 、外切 C 、内切或外切 D 、不能确定8、在数轴上表示有理数a 、b 、c 的小点分别是A 、B 、C 且b<a<c ,则下列图形正确的是( )A B C D 9、有理数中,绝对值最小的数是( ) A 、-1 B 、1 C 、0 D 、不存在10、21的倒数的相反数是( )A 、-2B 、2C 、-21D 、2111、若|x|=x ,则-x 一定是( )A 、正数B 、非负数C 、负数D 、非正数12、两个有理数的和除以这两个有理数的积,其商为0,则这两个有理数为( ) A 、互为相反数 B 、互为倒数 C 、互为相反数且不为0 D 、有一个为013、长方形的周长为x ,宽为2,则这个长方形的面积为( ) A 、2x B 、2(x-2) C 、x-4 D 、2·(x-2)/2 14、“比x 的相反数大3的数”可表示为( ) A 、-x-3 B 、-(x+3) C 、3-xD 、x+315、如果0<a<1,那么下列说法正确的是( ) A 、a 2比a 大B 、a 2比a 小C 、a 2与a 相等D 、a 2与a 的大小不能确定16、数轴上,A 点表示-1,现在A 开始移动,先向左移动3个单位,再向右移动9个单位,又向左移动5个单位,这时,A 点表示的数是( )A 、-1B 、0C 、1D 、817、线段AB=4cm ,延长AB 到C ,使BC=AB 再延长BA 到D ,使AD=AB ,则线段CD 的长为( )A 、12cmB 、10cmC 、8cmD 、4cm18、21-的相反数是( )A 、21+B 、12-C 、21--D 、12+-19、方程x(x-1)(x-2)=x 的根是( )A 、x 1=1, x 2=2B 、x 1=0, x 2=1, x 3=2C 、x 1=253+, x 2=253- D 、x 1=0,x 2=353+, x 3=253- 20、解方程04)1(5)1(322=-+++xx x x 时,若设y x x =+1,则原方程可化为( )A 、3y 2+5y-4=0 B 、3y 2+5y-10=0 C 、3y 2+5y-2=0 D 、3y 2+5y+2=0 21、方程x 2+1=2|x|有( )A 、两个相等的实数根;B 、两个不相等的实数根;C 、三个不相等的实数根;D 、没有实数根 22、一次函数y=2(x-4)在y 轴上的截距为( )A 、-4B 、4C 、-8D 、823、解关于x 的不等式⎩⎨⎧-<>ax ax ,正确的结论是( )A 、无解B 、解为全体实数C 、当a>0时无解D 、当a<0时无解 24、反比例函数xy 2=,当x ≤3时,y 的取值范围是( ) A 、y ≤32 B 、y ≥32C 、y ≥32或y<0D 、0<y ≤3225、0.4的算术平方根是( ) A 、0.2 B 、±0.2 C 、510D 、±510 26、李明骑车上学,一开始以某一速度行驶,途中车子发生故障,只好停车修理,车修好后,因怕耽误时间,于时就加快了车速,在下列给出的四个函数示意图象,符合以上情况的是( ) A B C D27、若一数组x 1, x 2, x 3, …, x n 的平均数为x ,方差为s 2,则另一数组kx 1, kx 2, kx 3, …, kx n 的平均数与方差分别是( ) A 、k x , k 2s2B 、x , s2C 、k x , ks2D 、k 2x , ks 228、若关于x 的方程21=+-ax x 有解,则a 的取值范围是( )A 、a ≠1B 、a ≠-1C 、a ≠2D 、a ≠±129、下列图形中既是中心对称图形,又是轴对称图形的是( )A 、线段B 、正三角形C 、平行四边形D 、等腰梯形 30、已知dcb a =,下列各式中不成立的是( )A 、d c b a d c b a ++=-- B 、d b c a d c 33++= C 、bd ac b a 23++= D 、ad=bc 31、一个三角形的三个内角不相等,则它的最小角不大于( ) A 、30B 、45C 、550D 、60032、已知三角形内的一个点到它的三边距离相等,那么这个点是( )A 、三角形的外心B 、三角形的重心C 、三角形的内心D 、三角形的垂心33、下列三角形中是直角三角形的个数有( )①三边长分别为3:1:2的三角形 ②三边长之比为1:2:3的三角形 ③三个内角的度数之比为3:4:5的三角形 ④一边上的中线等于该边一半的三角形 A 、1个 B 、2个 C 、3个 D 、4个34、如图,设AB=1,S △OAB =43cm 2,则弧AB 长为( )A 、3πcm B 、32πcm C 、6πcm D 、2πcm 35、平行四边形的一边长为5cm ,则它的两条对角线长可以是( ) A 、4cm, 6cm B 、4cm, 3cm C 、2cm, 12cm D 、4cm, 8cm 36、如图,△ABC 与△BDE 都是正三角形,且AB<BD ,若△ABC 不动,将△BDE 绕B 点旋转,则在旋转过程中,AE 与CD 的大小关系是( ) A 、AE=CD B 、AE>CD C 、AE>CD D 、无法确定37、顺次连结四边形各边中点得到一个菱形,则原四边形必是( ) A 、矩形 B 、梯形 C 、两条对角线互相垂直的四边形 D 、两条对角线相等的四边形38、在圆O 中,弧AB=2CD ,那么弦AB 和弦CD 的关系是( )A 、AB=2CDB 、AB>2CDC 、AB<2CD D 、AB 与CD 不可能相等 39、在等边三角形ABC 外有一点D ,满足AD=AC ,则∠BDC 的度数为( )A 、30B 、60C 、150D 、300或150040、△ABC 的三边a 、b 、c 满足a ≤b ≤c ,△ABC 的周长为18,则( )A 、a ≤6B 、b<6C 、c>6D 、a 、b 、c 中有一个等于641、如图,在△ABC 中,∠ACB=Rt ∠,AC=1,BC=2,则下列说法正确的是( )A 、∠B=30B 、斜边上的中线长为1C 、斜边上的高线长为552 D 、该三角形外接圆的半径为142、如图,把直角三角形纸片沿过顶点B 的直线BE (BE 交CA 于E )折叠,直角顶点C 落在斜边AB 上,如果折叠后得到等腰三角形EBA ,那么下列结论中(1)∠A=300(2)点C 与AB 的中点重合 (3)点E 到AB 的距离等于CE 的长,正确的个数是( ) A 、0 B 、1 C 、2 D 、3 43、不等式6322+>+x x 的解是( )A 、x>2B 、x>-2C 、x<2D 、x<-244、已知一元二次方程(m-1)x 2-4mx+4m-2=0有实数根,则m 的取值范围是( )A 、m ≤1B 、m ≥31且m ≠1C 、m ≥1D 、-1<m ≤1 45、函数y=kx+b(b>0)和y=xk-(k ≠0),在同一坐标系中的图象可能是( )ABA B C D46、在一次函数y=2x-1的图象上,到两坐标轴距离相等的点有( )A 、1个B 、2个C 、3个D 、无数个47、若点(-2,y 1)、(-1,y 2)、(1,y 3)在反比例函数xy 1=的图像上, 则下列结论中正确的是( )A 、y 1>y 2>y 3B 、y 1<y 2<y 3C 、y 2>y 1>y 3D 、y 3>y 1>y 2 48、下列根式是最简二次根式的是( ) A 、a 8 B 、22b a + C 、x 1.0 D 、5a49、下列计算哪个是正确的( )A 、523=+B 、5252=+C 、b a b a +=+22D 、212221221+=-50、把aa 1--(a 不限定为正数)化简,结果为( ) A 、a B 、a - C 、-a D 、-a -51、若a+|a|=0,则22)2(a a +-等于( ) A 、2-2a B 、2a-2 C 、-2 D 、252、已知02112=-+-x x ,则122+-x x 的值( )A 、1B 、±21 C 、21 D 、-2153、设a 、b 是方程x 2-12x+9=0的两个根,则b a +等于( )A 、18B 、6C 、23D 、±23 54、下列命题中,正确的个数是( B )①等边三角形都相似 ②直角三角形都相似 ③等腰三角形都相似④锐角三角形都相似 ⑤等腰三角形都全等 ⑥有一个角相等的等腰三角形相似⑦有一个钝角相等的两个等腰三角形相似 ⑧全等三角形相似 A 、2个 B 、3个 C 、4个 D 、5个 二、填空题1、如果一个数的绝对值等于它的相反数,那么这个数一定是_________。

九年级数学错题本整理范例

九年级数学错题本整理范例

九年级数学错题本整理范例一、数与代数1. 数的概念与性质错题示例:判断题:一个数的相反数一定是负数。

错因分析:对“相反数”的概念理解不全面。

一个数与其相反数之和为零,但一个数的相反数并不一定是负数,例如5的相反数是-5,而-5的相反数是5。

正确概念:一个数与其相反数的和为零。

正数的相反数是负数,负数的相反数是正数,零的相反数是零。

方法与技巧:在判断一个数的相反数是否为负数时,应首先判断这个数是否为正数。

2. 代数式的化简与求值错题示例:化简代数式:(x + 2y)(x - 2y) - (x + 4y)^2。

错因分析:在展开和化简过程中,没有正确地应用平方差公式和完全平方公式。

正确步骤:使用平方差公式:(x + 2y)(x - 2y) = x^2 - 4y^2。

展开(x + 4y)^2:x^2 + 8xy + 16y^2。

将两者相减:x^2 - 4y^2 - x^2 - 8xy - 16y^2 = -20y^2 - 8xy。

方法与技巧:在化简代数式时,应熟练掌握各种公式,如平方差公式、完全平方公式等,并注意运算顺序和符号处理。

二、方程与不等式1. 一元一次方程错题示例:解方程:3x - 2(x - 1) = 4。

错因分析:在去括号时没有正确应用分配律。

正确步骤:去括号:3x - 2x + 2 = 4。

移项:x = 2。

方法与技巧:在解一元一次方程时,应首先去括号,然后移项,最后合并同类项并求解。

2. 不等式与不等式组错题示例:解不等式组:{ x - 2 < 0, 2x > 3(x - 1) }。

错因分析:在解不等式时,没有正确应用不等式的性质。

正确步骤:解第一个不等式:x - 2 < 0,得到x < 2。

解第二个不等式:2x > 3x - 3,移项得-x > -3,即x < 3。

求两个不等式的交集,得到不等式组的解集为x < 2。

方法与技巧:在解不等式组时,应分别解出每个不等式的解集,然后求它们的交集。

完整word版-初三上学期数学错题集(一二)及答案

完整word版-初三上学期数学错题集(一二)及答案

初三上学期数学错题集(一元二次方程)(一) 2012.09.09已打印1、若方程(m-2)x㎡-2+mx2=7是关于x的一元二次方程,则m的值为。

2、根据题意,列出方程:(不必求解,写出一般形式)学校图书馆去年年底有图书5万册,预计到明年年底增加到7.2万册,求这两年的平均增长率。

3、方程x2=0的实数根有()A.0个B.1个C.2个D.1个或2个4、下列二次三项式中,是完全平方式的是(填序号)。

①9x2-12xy+4y2;②4y2-4y-1;③x2-25x+5;④2x2-4x+1;5、写出一个一元二次方程,使它的两根:一根是正数,另一根在-2与-1之间。

6、方程(x-2)(x+3)=6的解是()A.x1=-4,x2=3 B.x1=2,x2=3C.x1=2,x2=-3 D.x1=4,x2=-37、用因式分解法解方程5(x+3)-2x(x+3)=0,可把它化为两个一元一次方程、求解。

初三上学期数学错题集(一元二次方程)(二)2012.09.15已打印1、解方程:(1)3y(y-1)2=2-2y (2)7 x2=21x (3)(x2+1)2-3(x2+1)-28=02、若△ABC的边长都是方程x2-10x+21=0的根,求△ABC的周长。

3、若△ABC 的边长都是方程x 2-7x+12=0的根,求△ABC 的周长。

4、已知P=157m-1,Q= m 2-158m(m 为任意实数),则P 、Q 的大小关系为 ( ) A .P<Q B. P=Q C. P>Q D.不能确定 5、关于x 的方程(k+1)x 2+2(k+1) x+k=0无实数根,则k 的取值范围是 。

6、已知a 是整数,满足⎩⎨⎧>->+023013a a 试解关于x 的一元二次方程x 2-4=x(ax-3).7、k 为何值时,关于x 的方程(k-1)x 2-(2k+1) x+k+1 = 0(1)有一解?(2)有两个不相等的实数根?8、已知△ABC 的两边AB 、AC 的长是关于x 的一元二次方程x 2-(2k+1) x+k(k+1) = 0的两个实数根,第三边BC 的长为5.(1)k 为何值时,△ABC 是以BC 为斜边的直角三角形?(2)k 为何值时,△ABC 是等腰三角形?并求△ABC 的边长。

人教版中考易错题100题(适合于九年级总复习,中考易错题)

人教版中考易错题100题(适合于九年级总复习,中考易错题)

人教版九年级下册易错题综合复习一(C )1.Yesterday Mr.Green went to his hometown and visited the old house ____ he was born in.A.whatB.howC.whichD.that(B )2.There are 50 students in Class One. Twenty of them are boys, __ are girls.A.someB.the othersC.the otherD.others(A)3.She often parks her car near the house __ she can get to.A.whichB.whereC.thatD.what(B)4.Is this toy __ you played with last time ?A.thatB.the oneC.whichD.what(ACE)(不定项)5.Is this the toy ___ you played with last time ?A.thatB.the oneC.whichD.whatE./(AD )(不定项)6.Is this the factory __ you worked ?A.in whichB.whichC.thatD.where(B )7.-How can I pay full attention to my homework ?-Turn off your phone and B__ any possible bother.A.keeping offB.keep offC.to keep offD.kept off(C)8.-_C_ your homework faster, Danny. Then you can have more time to have fun.A.DoesB.DoingC.DoD.To do(B )9.I've never seen a movie __ than it.A.the most excitingB.more excitingC.a more excitingD.much exciting(A )10.It's ___ movie I've ever seen.A.the most excitingB.more excitingC.a more excitingD.much exciting(C)11.-May I help you with some jeans, sir ?-Yes, I'd like to try on those blue ___.A.pair C.ones C.one(A )12.- Is the river_____ through that town very large?A which flowsB flowsC that flowingD whose flows(C )13.The pen ___she writes letters is broken.A whichB thatC with whichD by which(D )14.He is one of the students who, I am sure, always do ____ best.A hisB one’sC myD their(A)15.The teacher gave me a piece of paper__A___.A to write onB to be written onC to write inD to be written(C )16.This is a film _C__ Spielberg used real actors instend of stunt men.A.whichB.whoseC.in whichD.of which(A)17.-How often do you write emails to your sister ?-Only once a month. A_ of us has enough time.A.NeitherB.EitherC.NoneD.All(D )18.People's way of life in the north is quite different from _D_ in the south.A.itB.thoseC.thisD.that1.The house is _C_ than that one.A.two-thirds largeB.two third largerC.two-thirds largerrger two-thirds(B )19.-Alice, are you going to Bob's birthday party on Saturday ?-Unless I __.A.will be invitedB.am invitedC.was invitingD.invited(D)20.-Close your eyes and guess what the box is made of.-It's so light. It must be made of__.A.ironB.metalC.silverD.plastic(C)21.-There is so much rubbish in the river.-Yes. Luckily, to save water, many things __.A.are doingB.are going to doC.are going to be doneD.are going to be doing(C )22.We should spend as much time as we can __ our lessons after class.A.to reviewB.reviewC.reviewing(A)23.We should do as much as we can __ our lessons after class.A.to reviewB.reviewC.reviewing(D)24.our school football team won the cup !-Well, it __ be true. We are far from the best team.A.mustn'tB.needn'tC.shouldn'tD.can't(B)25.-Madame Curie is one of the scientists __ won two Nobel Prizes.-She will be remembered by people for __ she discovered.A.that;thatB.who; whatC.who;thatD.which; what(D)26.__ is a pity that you can't go to the concert with me tonight.A.ThatB.WhatC.ThisD.It( C ) 27. — The cakes ____ delicious. I’d like to have one.— OK. Here you are.A. soundB. feelC. lookD. taste( A )28. — How much ____ the pair of gloves?— Twenty dollars ____ enough.A. is; isB. are; isC. is; areD. are; are( C )29.Lucy remembered __ the kitchen before leaving home. But as she entered it after work, she saw it was a mess.A.cleanB.have cleanedC.cleaningD.cleaned( B )30. — Are you busy working on the project, Tim?— Yes. If I finish the ____ earlier, we can go to a movie together.A. surveyB. taskC. goalD. process( A )31. — Do you remember attending Julia’s birthday party, John?— Yes. ____A. It was a really great time for me.B. I’m really looking forward to seeing her.C. Why not prepare a good present for her?D. She must be waiting for us to arrive there soon.( B/D )32.Our school organized a job fair and a computer company ____ my attention.A. matchedB. drewC. influencedD. caught(C )33.-Could I ask your neighbors for help, Tom ?-I'm afraid not. I __ know them.A.onlyB.seldomC.hardlyD.just(C )34.-My parents __ allow me to go swimming in the river without them.-I think so. That's too dangerous.A.shouldn'tB.mustn'tC.wouldn'tD.needn't(C )35.-Like so many creative people he is never __.-That's why he's made lots of valuable paintings.A.cheerfulB.skillfulC.satisfiedD.surprised(B )36.Why can ___ movies help improve our English ?A.to watchB.watchingC.watchedD.watch(A )37.My little sister fell in love with the movie __ Dumbo ___.A.called;as wellB.call; as well asC.called; eitherD.calling; too(C)38.They find __ difficult to understand what native English speakers say.A.thisB.himC.itD.that(A )39.Read something you are interested in, ___ that you have to read.A.orB.andC.but(B )40.Your dream will not come true __ you keep trying your best.A.whenB.unlessC.whetherD.because(C )41.Mr.Zhang, I have trouble ___ the text. Could you help me?-Certainly. First, remember __ it three times at least.A.to understand; readingB.understanding; readingC.understanding; to readD.to understand; to read(B )42.There are so many beautiful T-shirts. I really don’t know __.-Let’s ask the assistant for help.A.what I choose itB.which one to chooseC.how to chooseD.where I choose(B )43.I made a decision to go to Yunnan Province ___.A.on myselfB.on my ownC.in myselfD.in my own(B )44.-Can you give us some advice __ prevent the terrorist attack ? -Sorry. A.on how B.on how to C.to what D.to what to(D)45.I try to pay attention ___ fewer mistakes.A.makeB.makingC.to makeD.to making(A )46.People __ cross the road when the traffic lights are red.A.mustn’tB.needn’tC.mustD.need(B )47.David finds__ difficult to communicate with his parents.A.oneB.itC.thisD.that(D )48. Erquan Yingyue is one of __ pieces of folk music in China.A.more famousB.most famousC.famousD.the most famous(D )49.Everyone ___ down from 10:10.9.8...esB.turnsC.looksD.counts(A )50.___ exciting the news is ! Beijing will hold 2022 Winter Olympic Games.A.HowB.What aC.WhatD.What an(A )51.-I wonder ___. -I’m not sure yet.A.which is hersB.which hers isC.whether is it hersD.whether hers it is(A )52.How she __ that she could have __ in the new year !A.wished; good luckB.wish; good luckyC.hoped; good luckD.hope; a good luck(B )53.-___ your coat, it’s cold today.-Look at me. I’m ___ a coat.A.Wear; putting onB.Put on; wearingC.Dress; wearingD.Dresses; putting on(D)54.Please remind me __ Linda at 9:00 p.m.A.callB.calledC.callingD.to call(B )55.___ fun ___ a trick on someone on April 1st.A.It’s; playingB.It’s; to playC.That; playingD.That’s; to play(C )56.-Have you watched the movie named Amazing China ?-Sure, I have. __ great achievements our country has made !A.What aB.What anC.WhatD.How(D)57.-Do you know if Jim __ to the party ?-I am not sure. But if he___, I will give him a big surprise.es; will comeB.will come; will comees; comesD.will come; comes(D)58.-What did Tom say to you just now, John ? -He asked __.A.why I am so happy todayB.who did I play football with after schoolB.what will I do for the weekend D.if I could go to the movies with him tonight(D )59.-Our school will organize a spring outing next week.-___ wonderful news ! It’ll be a good time to relax ourselves.A.HowB.What aC.How aD.What(B)60.-What’s wrong with Lisa?-She didn’t do well in the exam. She worries about ___ she can pass it.A.thatB.whetherC.whatD.if(B )61.-With __ did you go to Beijing ?-My mother. We went to see my father.A.whichB.whomC.whoD.whose(B )62.-Could you please tell me ___ ?-No problem. It’s on Huayuan Road, a wonderful amusement park.A.where’s there a place to have funB.where there’s a place to have funC.where is a place to have funD.where a place is to have fun(A )63.We can get a lot of famous English movies ___ the Internet.A.onB.withC.byD.about(C)64.-All the money in Mary’s wallet was stolen, but her ID card ____. --But she remained __ as if nothing had happened.A.remained; happilyB.was remained; happilyC.remained;happyD.was remained; happy(A )65.I also learned that not all great ideas _____.A.workB.faileD.send(D )66.-Changchun has been building its subways since 2012.-Yes. It’ll be more convenient for people to go out after they’re all _____. A.processed B.created C.protected pleted(C )67.-Can I go out to play football, Mom ?-Look, your bedroom is in a mess. You can’t go out until it ____.A.cleansB.has cleanedC.is cleanedD.will be cleaned(A )68.-Hi, Pam ! __ this pair of gloves yours ?-No, but the scissors on the desk _____ mine.A.Is;areB.Is;isC.Are;isD.Are;are(A )69.-Have you ever been to ___, Sally ?-Yes, I traveled there last year. And I made friends with lots of __ there.A.Germany;GermansB.German; GermanyC.Germany; GermenD.Germans; Germany(C )70.-Can I go out to play football, Mom ?-Look, your bedroom is a mess. You can’t go out until it ____.A.cleansB.has cleanedC.is cleanedD.will be cleaned(D)71.A new kind of bikes ___ out already.A.have soldB.has soldC.has been soldD.have been sold(A )72.He was made ___ from morning till night.A.to workB.workC.workingD.worked(C )73.This book ____ everybody.A.is known byB.is known forC.is known toD.knows(C )74.-I find it hard to improve my spoken English soon.-Be patient, please. It needs a long __.A.introductionB.experienceC.processD.development(C )75. -You seldom have desserts, __.-___. It’s bad for my teeth, I think.A.do you; Yes, I doB.don’t you; Yes, I do.C.do you; No, I don’tD.don’t you; No, I don’t.(C)76.-People use smartphones ____.-Yes. They are very important in our __ life.A.everyday; everydayB.everyday; every dayC.every day; everydayD.every day; every day(B )77.Don’t play computer games unless your homework _____.A.has doneB.is doneC.was doneD.will be done(A )78.This kind of salad tasted ___ and it sells __.A.good;wellB.well;goodC.well;wellD.good;good(D )79.His bad marks made him ____.A.happyB.to happyC.to be unhappyD.unhappy(B)80.-Hurry up, the bus is coming.-Wait a minute. Don’t cross the street ____ the traffic light is green.A.afterB.untilC.whileD.unless(D )81.His speech __ a cheer among the students. They all __ from their chairs.A.rose; roseB.raised; raisedC.rose; raisedD.raised;rose(D )82.Many students enjoyed the book Harry Potter _____by J.K. Rowling. A.wrote B.was written C.was writing D.written(A )83. -Would your sister go to Hainan this summer?-If I don’t go, _______.A.neither will sheB. neither does sheC. so will sheD. so does she(C )84.My brother and I will go hiking tomorrow.-_____.Shall we go together?A.So do IB. So I doC. So will ID. So I will(B )85.The students are on their way home, ________ and ________ .A. laugh ; talkB. laughing ; talkingC. laughed ; talkingD. are laughing ;talking(B )86. Tomorrow I’ll get my hair_______. It’s a little long.A. cutsB. cutC. to cutD. cutting(C )87.You kept us_______ for a long time.A. waitB. to waitC. waitingD. waited(D )88.The old man needs to spend time ________ his family.A. onB. toC. inD. with(B )89.It would be better _____a mobile phone.A. haveB. to haveC. havingD. had(C )90.—Susan, why are you still here? They are all ready to start.—I’m sorry, but I _____when to leave.A.don’t tellB.didn’t tellC. wasn’t toldD. is told(B )91.__good advice you have given to me ! I'll take it.A.HowB.WhatC.HowD.What a(C )92.The world is changing fast every day. I wonder __ in the future.A.what will the world look likeB.how we think of the worldC.whether the world will have peaceD.which country wins the match(A )93.The show also __ the moving stories behind those people.A.tellsB.talksC.speaksD.says(C)94.—What_____to your city in recent years?-Lots of wide roads,tall buildings and beautifulparks have been built.A.takes placeB.have happenedC.has happenedD.happened (C)95. Jack,please don’t look out of the window.—_____.A.It’s right.B.I know that.C.Sorry,I don’t do it again.D.It doesn't matter.(A)96. —I have to be home by10:00p.m.—_____.A.So do IB.So have IC.So I doD.So I have(A)97.He made his sister_______at last.She began to laugh. A.stop crying B.to stop cryingC.stop to cryD.to stop to cry(C)98.Can you tell me______?A. where does he liveB. how did he come here yesterdayC. what his job isD.that he is good at English(A)puters_______in everyday life in this country before long.A.will be usedB.is usedC.will useD.was used(A/D)100.Every morning Mr.Smith takes a______to his office. A.20minutes’ walk B.20minute’s walkC.20-minutes walk D.20-minute walk。

中考经典错题集,精心整理版

中考经典错题集,精心整理版

易错题:例 1】 物体重为 0.5N ,把它放入盛有水的烧杯中,溢出重为0.3N 的水,则它受到的浮力( )A.0.3NB. 0.5NC.可能为 0.2ND. 可能为 0.4N与容器底部紧密接触的物体 中加入一些食盐,请问物体 A. 变大 B. 变小例 3 】 小明从学校旁边的小商店买了瓶饮料,饮料瓶子的形状如图所示,开始满瓶的饮料给小明喝了一些后,问剩余的饮料对瓶底的压力与剩余饮料自身的重力关系是(A .压力大于重力B .压力小于重力C .压力等于重力D .无法确定例 4】 如图所示的装置,已知物体 A 重为 60N ,在水平拉力 F 的作用下,物体 以0.2m/s 的速度做匀速直线运动,物体与水平地面之间的摩擦力为 12N ,若滑轮组的机械效率为 80%,则在 4s 内拉力 F 所做的功是 J 。

例 5】 如图,金属球 A 下吊着一个金属球 B ,恰好悬浮于水中.现沿杯壁往容器中 加入一定质量的水,结果金属球 B ( ) A .上浮 B .下沉 C .悬浮 D .以上均不对 例 6】 如例五图所示,气球 A 下吊着一个金属球 B ,恰好悬浮于水中.现沿杯壁往 容器中加入一定质量的水,结果金属球 B ( ) A .上浮 B .下沉 C .悬浮 D .以上均不对例 7 】 下列说法正确的是( )A .受摩擦力的作用的两个表面一定受弹力作用B .摩擦力一定与物体运动方向相反C .真实值与测量值之间的差异叫做误差D .在光的反射过程中,入射角等于反射角E .在平面镜成像过程中,物距等于像距F .导体电阻一定时,导体两端电压与通过该导体的电流成正比G .把装在盆里的水泼出去,这是利用了盆的惯性H .将锤柄在石墩上撞击几下,松动的锤头就紧套在锤柄上,这是利用了锤头的惯性 I .刘翔冲过终点线后,还得向前运动一段距离,这是由于刘翔受到了惯性的作用J .某一物体温度降低的多,放出热量就多 K .温度高的物体比温度低的物体含有热量多 L .温度总是从物体热的部分传递至冷的部分 M .1 牛的水可以产生 100 牛的压力【例 2】 定FAA 的体积为 100cm 3,浸没在水中,A 受到的浮力如何变化( )N.1 牛的水可以产生100 牛的浮力高频题:力和运动:例 8】 热气球以速度 v 匀速上升至 H 高度时,吊篮中突然掉出一只质量为 m 的小球,此后热气球上升速度将 v ;若不计空气对小球的作用力,且假设小球落地时与地面碰撞过程中机械 能没有损失, 则小球落地后再上升的最大高度将 H (选填“大于”“等于”“小于”)例 9 】 “蹦极”是一种富有刺激性的勇敢者的运动项目,如图所示,一根弹性橡皮 绳的一端系住人的腰部,另一端系于跳台。

中考物理错题本(超全!不看是你的损失)

中考物理错题本(超全!不看是你的损失)

中考物理错题大全初中物理经典易错题100例-力和运动1.在湖中划船时,使船前进的的动力是()A.桨划水的推力B.水直接对船的推力C.人对船的推力D.水对桨的推力2.踢到空中的足球,受到哪些力的作用( )A受到脚的作用力和重力 B受到重力的作用C只受到脚的作有力 D 没有受到任何力的作用3.一辆汽车分别以6米/秒和4米/秒的速度运动时,它的惯性大小:()A.一样大;B.速度为4米/秒时大;C.速度为6米/秒时大;D.无法比较4.站在匀速行驶的汽车里的乘客受到几个力的作用( )A.1个B.2 个C.3个D.4个5.甲、乙两个同学沿相反的方向拉测力计,各用力200牛.则测力计的示数为( )A、100牛B、200牛C、0牛D、400牛6.一物体受到两个力的作用,这两个力三要素完全相同,那么这两个力( )A 一定是平衡力B 一定不是平衡力C 可能是平衡力D 无法判断7.体育课上,小明匀速爬杆小刚匀速爬绳。

有关他们受到的摩擦力下面说法正确的是()A、因为爬杆时手握杆的压力大,所以小明受到的摩擦力一定大B、因为绳子粗糙,所以小刚受到的摩擦力一定大C、小明和小刚受到的摩擦力一定相等D、若小明的体重大,则他受到的摩擦力一定大8.如图所示,物体A在水平力F的作用下,静止在竖直墙壁上.当水平力减小为F/2时,物体A恰好沿竖直墙壁匀速下滑.此时物体A所受摩擦力的大小()A.减小为原来的1/2 B.和原来一样 C.增大为原来的2倍 D.无法判断9.蹦极游戏是将一根有弹性的绳子一端系在身上,另一端固定在高处,从高处跳下,a是弹性绳自然下垂的位置,C点是游戏者所到达的最低点,游戏者从离开跳台到最低点的过程中,物体速度是如何变化的?_______________10.A、B两物体叠放在水平桌面上,在如图所示的三种情况下:①甲图中两物体均处于静止状态;②乙图中水平恒力F作用在B物体上,使A、B一起以2m/s的速度做匀速直线运动;③丙图中水平恒力F作用在B物体上,使A、B一起以20m/s的速度做匀速直线运动。

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【例1】 物体重为0.5N ,把它放入盛有水的烧杯中,溢出重为0.3N 的水,则它受到的浮力( )A.0.3NB. 0.5NC.可能为0.2ND.可能为0.4N【例2】 与容器底部紧密接触的物体A 的体积为100cm 3,浸没在水中,如果往水中加入一些食盐,请问物体A 受到的浮力如何变化( )A.变大B. 变小C.不变D.无法确定【例3】 小明从学校旁边的小商店买了瓶饮料,饮料瓶子的形状如图所示,开始满瓶的饮料给小明喝了一些后,问剩余的饮料对瓶底的压力与剩余饮料自身的重力关系是( ) A .压力大于重力 B .压力小于重力C .压力等于重力D .无法确定【例4】 如图所示的装置,已知物体A 重为60N ,在水平拉力F 的作用下,物体以0.2m/s 的速度做匀速直线运动,物体与水平地面之间的摩擦力为12N ,若滑轮组的机械效率为80%,则在4s 内拉力F 所做的功是J 。

【例5】 如图,金属球A 下吊着一个金属球B ,恰好悬浮于水中.现沿杯壁往容器中加入一定质量的水,结果金属球B ( )A .上浮B .下沉C .悬浮D .以上均不对【例6】 如例五图所示,气球A 下吊着一个金属球B ,恰好悬浮于水中.现沿杯壁往容器中加入一定质量的水,结果金属球B ( )A .上浮B .下沉C .悬浮D .以上均不对【例7】 下列说法正确的是( )A .受摩擦力的作用的两个表面一定受弹力作用B .摩擦力一定与物体运动方向相反C .真实值与测量值之间的差异叫做误差D .在光的反射过程中,入射角等于反射角E .在平面镜成像过程中,物距等于像距F .导体电阻一定时,导体两端电压与通过该导体的电流成正比G .把装在盆里的水泼出去,这是利用了盆的惯性H .将锤柄在石墩上撞击几下,松动的锤头就紧套在锤柄上,这是利用了锤头的惯性 I .刘翔冲过终点线后,还得向前运动一段距离,这是由于刘翔受到了惯性的作用 J .某一物体温度降低的多,放出热量就多 K .温度高的物体比温度低的物体含有热量多 L .温度总是从物体热的部分传递至冷的部分 M .1牛的水可以产生100牛的压力 N .1牛的水可以产生100牛的浮力力和运动:【例8】 热气球以速度v 匀速上升至H 高度时,吊篮中突然掉出一只质量为m 的小球,此后热气球上升速度将 v ;若不计空气对小球的作用力,且假设小球落地时与地面碰撞过程中机械能没有损失,则小球落地后再上升的最大高度将 H (选填“大于”“等于”“小于”)【例9】 “蹦极”是一种富有刺激性的勇敢者的运动项目,如图所示,一根弹性橡皮绳的一端系住人的腰部,另一端系于跳台。

当人下落至图中Q 点时,橡皮绳刚好被拉直,那么在人越过Q 点继续向下的过程中,人的动能的变化情况是( )A .不变B .变大C .变小D .先变大后变小【例10】 如图所示,物体A 重为100牛在水平桌面上,滑轮和绳子重力以及滑轮轴处摩擦不计.当B物体重为10牛时,它恰好能匀速下滑.若在物体A 上再叠放一个重为100牛的物体C ,用一个水平向左的力拉物体A 使其向左匀速运动,则这个力的大小应是( ) A .5牛 B .10牛 C .15牛 D .20牛压强:【例11】 有两个用相同材料制成的圆柱体A 和B ,A 的高度是B 的高度的3倍,将A 竖直放在水平地面上,B 竖直放在A 上,如图甲所示,这时A 对地面的压强与B 对A 的压强之比为3:2,若将A 、B 倒置后仍放在水平地面上,如图乙所示,则A 对B 的压强与B 对水平地面的压强之比是( )A .1:3B .1:2C .4:1D .1:1【例12】 A 和B 是两块完全相同的砖,分别立放和平放在水平桌面上,B 砖上放有圆柱形玻璃容器,容器中盛有水,如图所示,容器接触B 砖上表面15面积,容器壁厚度和容器本身重忽略不计,这种砖的密度为33210kg/m ρ=⨯砖,A 砖的上表面和B砖的上表面到水平桌面的距离分别为24cm 和5cm ,计算时g 取10N/kg ,求:(1)A 砖对水平桌面的压强A p 是多少?(2)若容器中水的深度10cm ,则B 砖对水平桌面的压强B p甲乙BA AB【例13】 如图所示的一个容器中盛有水,容器上部的横截面积是250cm ,下部的横截面积是210cm ,水深h 是40cm ,A 点到容器底的高度1h 是10cm ,再向容器中倒入0.1kg 的水且不溢出,则水对容器底部的压力增加 N .(10N /k g g =)浮力:【例14】 有一质量为m 、半径为R 的半球放在盛有密度为ρ的液体的容器底部.如图所示.若液体的深度为h ,则液体对半球向上的压力为__________.在半球的上表面放一个质量为m 1的正方体A (液面高度仍为h ),若正方体A 与半球表面不紧密接触,则液体对半球向上的压力为__________.若正方体A 与半球表面紧密接触,则液体对半球向上的压力为__________.【例15】 如图所示,底面积为S 1=100cm 2的圆柱形容器中装有未知密度的液体.将一正方体实心铁块放入底面积为S 2=10cm 2的长方体塑料盒中(塑料盒的厚度可忽略不计),塑料盒漂浮在液面上(液体不会溢出容器),其浸入液体的深度为h 1=20cm .若把金属块从塑料盒中取出,用细线系在塑料盒的下方,放入液体中,金属块不接触容器,塑料盒浸入液体的深度为h 2=15cm .剪断细线,金属块会沉到容器的底部,塑料盒漂浮在液面上,其浸入液体的深度为h 3=10cm .若塑料盒始终处于如图所示的直立状态而未发生倾斜,则细线剪断前、后液体对圆柱形容器底部的压强减小了 .(37.8g /c m ρ=铁)【例16】 如图所示的容器, 上部横截面积为S 1=100cm 2, 中间部分横截面积为S 2=200cm 2, 底部横截面积为S 3=150cm 2,容器上中下三部分高都为 h ,且h =20cm ,容器中盛有某种液体,有一个空心金属球用细绳系住,绳的另一端栓在容器底部, 此时球全部浸没在液体中, 位置如图, 绳对球的拉力为F =5N, 如将细绳剪断, 待空心金属球静止后液面高 度大于2h ,则液体对容器底部的压力减少了 .简单机械:【例17】如图所示,杠杆两端分别挂甲、乙两实心铝块,杠杆平衡;1.若将甲、乙两铝块下都悬挂一个质量相同的钩码,则()2.若给甲、乙两铝块分别作用大小相等方向竖直向上的力F,则()3.若将甲、乙两铝块都浸没在水中,且保证铝块与容器均不接触,则()A.杠杆仍平衡B.杠杆左端下沉C.杠杆右端下沉D.无法判断【例18】小臣同学家中的墙壁上竖直悬挂着一指针式电子钟,当其因电池电能不是而停止时,指针最可能停在如图中所示的哪个位置附近()【例19】如图所示,一根粗细不均匀的打狗棍用铰链固定在竖直墙壁上,该棍在力F的作用下可在竖直的面上无摩擦地缓慢地转动。

若力F方向始终与该棍垂直,则F大小如何改变()若力F方向始终水平向右,则F大小如何改变()A.一直变大B.一直变小C.先变大后变小D.先变小后变大【例20】每一个滑轮重为20N,物体重为100N,图(3)中木板重为100N,人重为500N,保持整个装置静止,则以下图中力F大小分别为多少?【例21】定滑轮重为500N,动滑轮为100N,人重为500N,木板重为100N,台秤重为100N,问台秤示数为____N,弹簧测力计示数为____N,天花板对绳子的拉力为____N。

功和机械效率:【例22】工人用如图所示的装置打捞物体. 已知B为重力为200N的密封的箱子, B的总体积为0.01m3.A物体的重力大小为500N, 动滑轮重力大小为100N. 当B箱完全浸没水中匀速上升时,此时滑轮组的机械效率为 ; 当完全出水面以后,这时此装置提升重物A的机械效率为 .(不计绳重及绳与轮之间的摩擦, 取g=10N/kg)【例23】图甲所示是工人利用滑轮组从竖直深井中提取泥土的情形, 所用动滑轮和筐受到的总重力为20N. 某次操作中,将重423N的泥土以0.4m/s的速度匀速提起, 在此过程中工人的拉力F所做的功随时间变化的图像如图乙所示. 细绳的质量忽略不计, g取10N/kg. 求:(1)拉力F做功的功率;(2)利用该装置提升泥土的机械效率;【例24】如图所示装置,:1:2OA OB ,,不计绳重及绳与轮之间的摩擦,左边容器上部横截面积21100cm S =,底部横截面积2250cm S =,物体A 的重力100N A G =,开始让物体A 进入容器内,当A 完全浸没时,容器底受到水的压力增大5N 。

当A 运动到容器下部分时,和容器内壁产生摩擦,且恰好做匀速竖直向下直线运动,此时,人对地面的压强为41.910Pa ⨯,已知人的重力为500N ,双脚与地接触面积为2250cm ,滑轮重均为10N ,则要使物体A 在容器底部匀速上升时,人对地面的压强为__________Pa.(假设与容器下半部分摩擦力不变)电学基础:【例25】 下列电路中属于串联的是 ,属于并联的是 ,错误的是【例26】 如图,电源电压为30V ,电阻30R =Ω,滑动变阻器的最大阻值为50Ω,求(1)当滑片由a 端移到b 端的过程中V 的最大读数?(2)若V 量程为0~15V ,要使它接在电路中不被损坏,P 只能阻值为多大的范围内滑动?(3)若把一只量程为0~0.6A 的A 接在C 、D 两点上,为了不损坏A 和V ,滑片P 只能在多大的范围内滑动?如图所示电路,滑动变阻器的滑片在某两点间移动时,电流表的示数变化范围在0.1A 至0.4A ,电压表的示数变化范围在2V 至5V .当滑动变阻器的滑片在这两点间移动过程中,滑动变阻器消耗的最大电功率是______W .【例27】 在如图所示电路中,电源电压保持不变.闭合开关S ,当滑动变阻器的滑片P 向右滑动时,四个电表的示数都发生了变化,电表示数变化量的大小分别用12I U U Δ、Δ、Δ和3U Δ表示,已知1U Δ=3V ,3U Δ=2V ,R 1=3 ,则R 3=电学综合:【例28】如图所示电路,电源两端电压保持不变。

当开关S1闭合、S2断开,滑动变阻器的滑片P移到B端时,灯L的电功率为P L,电流表的示数为I1;当开关S1断开、S2闭合时,灯L的电功率为P L’,电流表的示数为I2。

已知:9:25P P'=。

L L(1)求电流表示数I1和I2的比值;(2)当开关S1、S2都断开,滑动变阻器的滑片P在C点时,变阻器接入电路的电阻为R C,电压表V1的示数为U1,电压表V2的示数为U2,已知U1︰U2=3︰2,R C的电功率为10W,这时灯L 正常发光。

通过闭合或断开开关及移动滑动变阻器的滑片P,会形成不同的电路,在这些不不同的电路中,电路消耗的最大功率与电路消耗的最小功率之比为3︰1。

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