nse7A初一上学期易错单选题专项练习
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七年级上册英语易错题目检测题一、单项选择(共36分) ( )1. _________ --He is OK. Thank. A. What does he do B. He is OK? C. How is Jim? D. How are you? ( ) 2. This is my good friend. First name is Mary.A. SheB. HisC. HerD. him ( ) 3. –Is that your pen? Yes, _________. A. it is B. that is C. this is D. it isn ’t ( ) 4. -- ?—They ’re fine, thanks. A. How are you B. How ’s your brothers C. What are they D. How are your parents? ( ) 5. –Are those cars?—Yes, ________ A. they are B. those are C. they ’re D. these are ( ) 6. —Is __ ___your brother? A. the boy B. a boy C. the girl D. a girl ( ) 7. –Hi, Bill! Is this your bike or Anna ’s? –It ’s mine, not______. A. her B. him C. his D. hers ( ) 8. There is _______ eraser on the desk. ______ eraser is mine. A. the; A B. the; An C. an; The D. a; The ( ) 9. Dad, please help ________. A. me B. my C. I D. mine ( ) 10. –Where are your brothers? -- ____________. A. He is at home B. He is in his room C. Yes, they are. D.I don ’t known. ( ) 11. Soccer players need to eat . A. good B. well C. nice D. fine ( ) 12. –Can I help you?—Yes, I want ____. A. two bottle of milk B. two bottles of milks C. two bottle of milks D. two bottles of milk ( ) 13. –Do you have ____ apples? --Sorry, I don ’t have ______, but I have oranges. A. any; any ; any B. some ;some ; some C. any ;some ; some D. any ;any ;some ( ) 14. Mike and Tom like hamburgers? A. Do B. Does C. Is D. Are ( ) 15. I like red but my brother _____. A. likes red, too B. doesn ’t C. does D. Doesn ’t like ( ) 16. How much _____ this pair of socks? A. is B. are C. be D. it ’s( ) 17.--How much is the jacket? –Twenty dollars enough.A. isB. areC. amD. it ’s( ) 18.There are _____months in a year. Months is December.A. twelfth; TwelfthB. twelve ;TwelveC. twelfth ;The twelfthD. twelve ;The twelfth( ) 19. Is this _____ desk?班级姓名考号.密封线内不准答 题A. Tom and JaneB. Tom and Jane’sC. Tom’s and Jane’sD. Tom’s and Jane ( ) 20.—What’s twenty and twenty? –It’s _____.A. fourtyB. fortyC. fourteenD. forteen( ) 21.—Mr. Zhang says book is useful. –Yes, it’s _____ useful book.A. a; aB. the; aC. the; anD. an; an( ) 22.—Is this white ruler? –No. _____ is yellow.A. your; MineB. your; YoursC. your; MyD. her; Her( ) 23.The computer game is . It’s not_____ .A. John; yoursB. Bob’s; hersC. Mary’s; myD. Lucy; mine( ) 24.V olleyball stars must eat . They have good _____ habits.A. good; eatB. well; eatingC. well; eatsD. nice; eat( ) 25.Do you have a history lesson the after of Tuesday?A. inB. atC. onD. for( ) 26.Let’s and football on the playground.A. to go; to playB. go; playC. to go; playD. go; to play( ) 27.My sister some bread and milk for breakfast.A. haveB. hasC. eatsD. like( ) 28.The green shorts 30 yuan.A. is on saleB. are on saleC. are on the sale forD. are on sale for( ) 29. -- ?A. What day is it todayB. What the timeC. What’s the date todayD. Is it Monday ( ) 30.Mr. Chen teaches math. We all like very much.A. us; hisB. our; hisC. us; himD. our; him( ) 31.I don’t like fruit. Please take the away.A. tomatoesB. eggsC. ice-creamD. strawberries( ) 32. are new in our class. desks are over there.A. Their; TheirB. We; OurC. Our; TheyD. They; They( ) 33.Please take things to Mr. Wang. He them.A. this; needB. this; needsC. these; needD. these; needs( ) 34.The price of socks 3 dollars.A. isB. areC. doesD. can( ) 35. boys, the shorts blue are at great sale.A. For ; with; forB. For ;for ; atC. To ;in ; withD. To ; with ; in( ) 36. Day is on June 1st and Day is on September 10th.A. Children’s; Teacher’sB. Children’s; Teachers’C. Childrens’; TeacherD. Children’; Teachers’二、用词的正确形式填空。
七年级上册数学全册单元试卷易错题(Word版含答案)一、初一数学上学期期末试卷解答题压轴题精选(难)1.如图,已知:点不在同一条直线, .(1)求证: .(2)如图②,分别为的平分线所在直线,试探究与的数量关系;(3)如图③,在(2)的前提下,且有,直线交于点,,请直接写出 ________.【答案】(1)证明:过点C作,则,∵∴∴(2)解:过点Q作,则,∵,∴∵分别为的平分线所在直线∴∴∵∴(3):1:2:2【解析】【解答】解:(3)∵∴∴∵∴∵∴∴∴∴ .故答案为: .【分析】(1)过点C作,则,再利用平行线的性质求解即可;(2)过点Q作,则,再利用平行线的性质以及角平分线的性质得出,再结合(1)的结论即可得出答案;(3)由(2)的结论可得出,又因为,因此,联立即可求出两角的度数,再结合(1)的结论可得出的度数,再求答案即可.2.如图1,已知∠MON=140°,∠AOC与∠BOC互余,OC平分∠MOB,(1)在图1中,若∠AOC=40°,则∠BOC=°,∠NOB=°.(2)在图1中,设∠AOC=α,∠NOB=β,请探究α与β之间的数量关系(必须写出推理的主要过程,但每一步后面不必写出理由);(3)在已知条件不变的前提下,当∠AOB绕着点O顺时针转动到如图2的位置,此时α与β之间的数量关系是否还成立?若成立,请说明理由;若不成立,请直接写出此时α与β之间的数量关系.【答案】(1)解:如图1,∵∠AOC与∠BOC互余,∴∠AOC+∠BOC=90°,∵∠AOC=40°,∴∠BOC=50°,∵OC平分∠MOB,∴∠MOC=∠BOC=50°,∴∠BOM=100°,∵∠MON=40°,∴∠BON=∠MON-∠BOM=140°-100°=40°,(2)解:β=2α-40°,理由是:如图1,∵∠AOC=α,∴∠BOC=90°-α,∵OC平分∠MOB,∴∠MOB=2∠BOC=2(90°-α)=180°-2α,又∵∠MON=∠BOM+∠BON,∴140°=180°-2α+β,即β=2α-40°;(3)解:不成立,此时此时α与β之间的数量关系为:2α+β=40°,理由是:如图2,∵∠AOC=α,∠NOB=β,∴∠BOC=90°-α,∵OC平分∠MOB,∴∠MOB=2∠BOC=2(90°-α)=180°-2α,∵∠BOM=∠MON+∠BON,∴180°-2α=140°+β,即2α+β=40°,答:不成立,此时此时α与β之间的数量关系为:2α+β=40.【解析】【分析】(1)先根据余角的定义计算∠BOC=50°,再由角平分线的定义计算∠BOM=100°,根据角的差可得∠BON的度数;(2)同理先计算∠MOB=2∠BOC=2(90°-α)=180°-2α,再根据∠BON=∠MON-∠BOM列等式即可;(3)同理可得∠MOB=180°-2α,再根据∠BON+∠MON=∠BOM列等式即可.3.如图,已知∠AOB=120°,OC⊥OB,按下列要求利用量角器过点O作出射线OD、OE;(1)在图①中作出射线OD满足∠COD=50°,并直接写出∠AOD的度数是________;(2)在图②中作出射线OD、OE,使得OD平分∠AOC,OE平分∠BOD,并求∠COE的度数;(3)如图③,若射线OD从OA出发以每秒10°的速度绕点O顺时针方向旋转,同时射线OE从OC出发以每秒5°的速度绕点O顺时针方向旋转,设旋转的时间为t秒,在旋转过程中,当OB第一次恰好平分∠DOE时,求出t的值,并作出此时OD、OE的大概位置.【答案】(1)20°或80°(2)解:如图,∵CO⊥BO ∴∠COB=90°∵∠AOB=120°∴∠AOC=120°-90°=30°∵OD平分∠AOC ∴∠COD= ∠AOC=15°∴∠BOD=90°+15°=105°, ∵OE是∠BOD的平分线∴∠EOD= ∠BOD=52.5°∴∠COE=52.5°-15°=37.5°.(3)解:如图,根据题意有:30°+5t+(90°-5t)×2=10t 解得:t=14.【解析】【解答】解:(1)有两种情况分别是:①当OD在∠AOB内部时,如图,∵CO⊥BO∴∠COB=90°∵∠AOB=120°∴∠AOC=120°-90°=30°∵∠COD=50°,∴∠AOD=50°+30°=80°;.②当OD在∠AOB外部时,如图,∵CO⊥BO∴∠COB=90°∵∠AOB=120°∴∠AOC=120°-90°=30°∵∠COD=50°,∴∠AOD=50°-30°=20°【分析】(1)有两种情况分别是:①当OD在∠AOB内部时,如图,根据垂直的定义及角的和差,由∠AOC=∠AOB-∠BOC即可算出∠AOC的度数,最后根据∠AOD=∠AOC+∠COD即可算出答案;②当OD在∠AOB外部时,如图,根据垂直的定义及角的和差,由∠AOC=∠AOB-∠BOC即可算出∠AOC的度数,最后根据∠AOD=∠COD-∠COA即可算出答案;(2)根据垂直的定义及角的和差,由∠AOC=∠AOB-∠BOC即可算出∠AOC的度数,根据角平分线的定义得出∠COD= ∠AOC算出∠COD的度数,根据角的和差,由∠BOD=∠COD+∠BOC算出∠BOD的度数,再根据角平分线的定义得出∠EOD= ∠BOD得出∠EOD的度数,最后根据∠COE=∠EOD- ∠COD算出答案;(3)根据题意∠AOD=10t,∠COE=5t,根据角的和差得出∠BOD=∠AOD-∠AOB=10t-120°,∠BOE=∠COB-∠COE=90°-5t,然后根据角平分线的定义得出∠BOD=∠BOE,从而列出方程,求解即可。
七年级数学上册全册单元测试卷易错题(Word版含答案)一、初一数学上学期期末试卷解答题压轴题精选(难)1.已知,,点E是直线AC上一个动点(不与A,C重合),点F是BC边上一个定点,过点E作,交直线AB于点D,连接BE,过点F作,交直线AC于点G.(1)如图①,当点E在线段AC上时,求证:.(2)在(1)的条件下,判断这三个角的度数和是否为一个定值?如果是,求出这个值,如果不是,说明理由.(3)如图②,当点E在线段AC的延长线上时,(2)中的结论是否仍然成立?如果不成立,请直接写出之间的关系.(4)当点E在线段CA的延长线上时,(2)中的结论是否仍然成立?如果不成立,请直接写出之间的关系.【答案】(1)解:∵∴∵∴∴(2)解:这三个角的度数和为一个定值,是过点G作交BE于点H∴∵∴∴∴即(3)解:过点G作交BE于点H∴∵∴∴∴即故的关系仍成立(4)不成立| ∠EGF-∠DEC+∠BFG=180°【解析】【解答】解:(4)过点G作交BE于点H∴∠DEC=∠EGH∵∴∴∠HGF+∠BFG=180°∵∠HGF=∠EGF-∠EGH∴∠HGF=∠EGF-∠DEC∴∠EGF-∠DEC+∠BFG=180°∴(2)中的关系不成立,∠EGF、∠DEC、∠BFG之间关系为:∠EGF-∠DEC+∠BFG=180°故答案为:不成立,∠EGF-∠DEC+∠BFG=180°【分析】(1)根据两条直线平行,内错角相等,得出;两条直线平行,同位角相等,得出,即可证明.(2)过点G作交BE于点H,根据平行线性质定理,,,即可得到答案.(3)过点G作交BE于点H,得到,因为,所以,得到,即可求解.(4)过点G作交BE于点H,得∠DEC=∠EGH,因为,所以,推得∠HGF+∠BFG=180°,即可求解.2.把一副三角板放成如图所示.(1)当OD平分∠AOB时,求∠COB;(2)若摆成如图2,OB、OD重合,OM平分∠AOD,ON平分∠AOC,求∠MON;(3)将三角板OCD绕O点旋转,把OD旋转到∠AOB的内部或外部,(2)中的条件不变,试问∠MON的角度是否变化?若不变,求出它的值,并说理由.【答案】(1)解:∵OD平分∠AOB,∠AOB=90°∴∠DOB=∠AOB=45°∵∠DOC=30°∴∠COB=∠DOB-∠DOC=45°-30°=15°(2)解:如图,∵OM平分∠AOD,ON平分∠AOC∴∠MOA=∠AOD=45°∠AON=∠AOC=(90°+30°)=60°∴∠MON=∠AON-∠AOM=60°-45°=15°(3)解:把OD旋转到∠AOB的内部时,如图,∵OM平分∠AOD,ON平分∠AOC∴∠MOA=∠AOD=(90°-∠BOD)=45°-∠BOD∠AON=∠AOC=(∠AOB+∠COD-∠BOD)=60°-∠BOD∴∠MON=∠AON-∠MOA=15°把OD旋转到∠AOB的外部时,如图,设∠AOC=α,则∠AOD=360°-30°-α=330°-α∵OM平分∠AOD,ON平分∠AOC∴∠MOA=∠AOD=(330°-α)=165°-α∠AON=∠AOC=α∠MON=∠MOA+∠AON=165°-α+α=165°∴∠MON=15°或∠MON=165°【解析】【分析】(1)利用角平分线的定义求出∠DOB的度数,再根据∠COB=∠DOB-∠DOC,就可求出结果。
2023年七年级上册各科易错题一、数学1.错误类型:概念不清学生容易混淆直线、线段和射线的概念,难以准确区分三者的特点和表达方式。
2.错误类型:计算错误学生在解决简单的加减乘除题目时,容易出现粗心计算错误,导致答案错误。
3.错误类型:应用题不熟学生在解决应用题时,往往无法准确把握题目的要点,导致无法正确运用所学知识解题。
4.错误类型:待定学生在学习过程中,还存在待定的易错题型,需要进行进一步的观察和归纳。
二、语文1.错误类型:字音字形混淆学生在书写和阅读时,常常混淆一些字音相近、字形相近的汉字,导致对文意的理解和表达出现偏差。
2.错误类型:语法错误学生在句子构造和修辞表达方面易出现语法错误,尤其是在虚词、连词和语序方面容易犯错。
3.错误类型:阅读理解学生在阅读理解能力方面存在问题,难以理解文章的主旨和要点,导致答案出现偏差。
4.错误类型:待定学生在学习过程中,还存在待定的易错题型,需要进行进一步的观察和归纳。
三、英语1.错误类型:词汇拼写错误学生在写作及填空题时,容易出现一些基础词汇的拼写错误,特别是一些易混淆的单词。
2.错误类型:语法错误学生在句子构造和语法运用方面容易出现错误,尤其在时态、语态和非谓语动词的使用上存在困难。
3.错误类型:阅读理解学生在阅读理解能力方面存在问题,难以准确理解文章的主旨和细节内容,导致答案错误。
4.错误类型:待定学生在学习过程中,还存在待定的易错题型,需要进行进一步的观察和归纳。
七年级上册各科易错题主要集中在数学、语文和英语三个学科。
而这些易错题的存在,既反映了学生在知识学习和应用方面的薄弱环节,也给教师在教学实践中提出了挑战。
我们需要通过针对性的教学和训练,引导学生找准错题的规律和原因,不断提高他们的学习能力和应试能力。
也需要不断完善教学内容和方法,为学生提供更加丰富和有效的学习资源和环境,让他们能够在学科学习中持续进步,取得更好的成绩。
七年级上册各科易错题的存在,既反映了学生在知识学习和应用方面的薄弱环节,也给教师在教学实践中提出了挑战。
初一上期末易错题整理一、单项选择。
( ) 1. The girl _____________ a grey blouse and she wants to dress up as an old lady.A.inB. wearingC. put onD. dresses up in解析:选择D。
in+颜色/衣服,wear表示状态,put on 表示动作,dress up表示装扮,此题and是关键,应该是连接两个句子,因为是一般现在时,排除B,C,因为in为介词,所以不能做谓语成分,所以选择D。
( ) 2. We always have a Christmas party _________ the morning of Christmas 25th.A.atB. inC. onD. before解析:选择C。
在具体某一天的早晨前用on( ) 3. There is going to ____________ a class meeting this afternoon.A.haveB. /C. beD. has解析:选择C。
此题是there be和be going to的结合,所以应该变成there is going to be,选择C。
( ) 4. ----Do you know _______the man is?----I hear he is much better these days.A.whatB. howC. whoD. where解析:选择B。
根据答句:我听说他这些天好多了。
所以问句应该是问这个男人怎么样了,用how提问,选择B。
( ) 5. ----________ do you watch TV every week?----Less than two hours. I often have much homework to do.A.How manyB. How muchC. How longD. How often解析:选择C。
2024版七年级上册数学易错题综合练习专业课试题部分一、选择题(每题2分,共30分)1. 一个三位数的十位和百位数字相同,且都不为零,个位数字比十位数字大2,这个三位数是()A. 255B. 266C. 247D. 2332. 下列各数中,最小的是()A. |3|B. |3|C. 3^2D. (3)^23. 已知a+b=5,ab=3,则a^2+b^2的值为()A. 7B. 16C. 23D. 324. 下列各式中,正确的是()A. |a|=aB. |a|=aC. |a|=±aD. |a|≥a5. 有理数a、b在数轴上的对应点如图所示,则()A. |a|>|b|B. |a|<|b|C. a<bD. a>b二、判断题(每题2分,共30分)6. 互为相反数的两个数的和为0。
()7. 两个负数相乘,积一定是正数。
()8. 任何两个有理数都可以比较大小。
()9. |3|=3。
()10. 2^3和3^2相等。
()三、填空题(每题2分,共30分)11. 若|a|=5,则a=______。
12. 若a+b=7,ab=3,则a=______,b=______。
13. 已知a、b互为相反数,且|a|=3,则a=______,b=______。
14. 若2x3=7,则x=______。
15. 若x^2=16,则x=______。
四、简答题(每题6分,共30分)16. 请简要说明有理数的乘法法则。
17. 请举例说明相反数的概念。
18. 请解释绝对值的意义。
19. 请简述解一元一次方程的基本步骤。
20. 请举例说明如何用数轴比较两个有理数的大小。
五、应用题(每题10分,共50分)21. 某数的2倍与3的差是7,求这个数。
22. 已知一个数的平方是25,求这个数的相反数。
23. 一个数的3倍减去5等于这个数的2倍加上3,求这个数。
24. 甲、乙两人年龄之和为35岁,甲的年龄是乙的2倍,求甲、乙两人的年龄。
人教版数学七年级上册全册单元试卷易错题(Word版含答案)一、初一数学上学期期末试卷解答题压轴题精选(难)1.(1)如图①,已知:Rt△ABC中,AB=AC,直线m经过点A,BD⊥m于D,CE⊥m于E,求证:DE=BD+CE;(2)如图②,将(1)中的条件改为:△ABC中,AB=AC,并且∠BDA=∠AEC=∠BAC=α,α为任意锐角或钝角,请问结论DE=BD+CE是否成立?如成立,请证明;若不成立,请说明理由;(3)应用:如图③,在△ABC中,∠BAC是钝角,AB=AC,∠BAD>∠CAE,∠BDA=∠AEC=∠BAC,直线m与BC的延长线交于点F,若BC=2CF,△ABC的面积是12,求△ABD与△CEF的面积之和.【答案】(1)证明:∵BD⊥直线m,CE⊥直线m,∴∠BDA=∠CEA=90°,∵∠BAC=90°,∴∠BAD+∠CAE=90°,∵∠BAD+∠ABD=90°,∴∠CAE=∠ABD,在△ADB和△CEA中,∴△ADB≌△CEA(AAS),∴AE=BD,AD=CE,∴DE=AE+AD=BD+CE;(2)解:结论DE=BD+CE成立;理由如下:∵∠BDA=∠BAC=α,∴∠DBA+∠BAD=∠BAD+∠CAE=180°-α,∴∠CAE=∠ABD,在△ADB和△CEA中,∴△ADB≌△CEA(AAS),∴AE=BD,AD=CE,∴DE=AE+AD=BD+CE;(3)解:∵∠BAD>∠CAE,∠BDA=∠AEC=∠BAC,∴∠CAE=∠ABD,在△ABD和△CEA中,∴△ABD≌△CEA(AAS),∴S△ABD=S△CEA,设△ABC的底边BC上的高为h,则△ACF的底边CF上的高为h,∴S△ABC= BC•h=12,S△ACF= CF•h,∵BC=2CF,∴S△ACF=6,∵S△ACF=S△CEF+S△CEA=S△CEF+S△ABD=6,∴△ABD与△CEF的面积之和为6.【解析】【分析】(1)根据BD⊥直线m,CE⊥直线m得∠BDA=∠CEA=90°,而∠BAC=90°,根据等角的余角相等得∠CAE=∠ABD,由AAS证得△ADB≌△CEA,则AE=BD,AD=CE,即可得出结论;(2)由∠BDA=∠BAC=α,则∠DBA+∠BAD=∠BAD+∠CAE=180°-α,得出∠CAE=∠ABD,由AAS证得△ADB≌△CEA即可得出答案;(3)由∠BAD>∠CAE,∠BDA=∠AEC=∠BAC,∴∠CAE=∠ABD,得出∠CAE=∠ABD,由AAS证得△ADB≌△CEA,得出S△ABD=S△CEA,再由不同底等高的两个三角形的面积之比等于底的比,得出S△ACF即可得出结果.2.如图,已知AB∥CD,现将一直角三角形PMN放入图中,其中∠P=90°,PM交AB于点E,PN交CD于点F(1)当△PMN所放位置如图①所示时,则∠PFD与∠AEM的数量关系为________;(2)当△PMN所放位置如图②所示时,求证:∠PFD−∠AEM=90°;(3)在(2)的条件下,若MN与CD交于点O,且∠DON=30°,∠PEB=15°,求∠N的度数.【答案】(1)∠PFD+∠AEM=90°(2)过点P作PG∥AB∵AB∥CD,∴PG∥AB∥CD,∴∠AEM=∠MPG,∠PFD=∠NPG∵∠MPN=90°∴∠NPG-∠MPG=90°∴∠PFD-∠AEM=90°;(3)设AB与PN交于点H∵∠P=90°,∠PEB=15°∴∠PHE=180°-∠P-∠PEB=75°∵AB∥CD,∴∠PFO=∠PHE=75°∴∠N=∠PFO-∠DON=45°.【解析】【解答】(1)过点P作PH∥AB∵AB∥CD,∴PH∥AB∥CD,∴∠AEM=∠MPH,∠PFD=∠NPH∵∠MPN=90°∴∠MPH+∠NPH=90°∴∠PFD+∠AEM=90°故答案为:∠PFD+∠AEM=90°;【分析】(1)过点P作PH∥AB,然后根据平行于同一条直线的两直线平行可得PH∥AB∥CD,根据平行线的性质可得∠AEM=∠MPH,∠PFD=∠NPH,然后根据∠MPH+∠NPH=90°和等量代换即可得出结论;(2)过点P作PG∥AB,然后根据平行于同一条直线的两直线平行可得PG∥AB∥CD,根据平行线的性质可得∠AEM=∠MPG,∠PFD=∠NPG,然后根据∠NPG-∠MPG=90°和等量代换即可证出结论;(3)设AB与PN 交于点H,根据三角形的内角和定理即可求出∠PHE,然后根据平行线的性质可得∠PFO=∠PHE,然后根据三角形外角的性质即可求出结论.3.点A、B在数轴上分别表示实数a、b,A、B两点之间的距离记作AB.当A、B两点中有一点为原点时,不妨设A点在原点.如图①所示,则AB=OB=|b|=|a﹣b|.当A、B两点都不在原点时:⑴如图②所示,点A、B都在原点的右边,不妨设点A在点B的左侧,则AB=OB﹣OA=|b|﹣|a|=b﹣a=|b﹣a|=|a﹣b|⑵如图③所示,点A、B都在原点的左边,不妨设点A在点B的右侧,则AB=OB﹣OA=|b|﹣|a|=﹣b﹣(﹣a)=a﹣b=|a﹣b|⑶如图④所示,点A、B分别在原点的两边,不妨设点A在点O的右侧,则AB=OB+OA=|b|+|a|=a+(﹣b)=|a﹣b|回答下列问题:(1)综上所述,数轴上A、B两点之间的距离AB=________.(2)数轴上表示2和﹣4的两点A和B之间的距离AB=________.(3)数轴上表示x和﹣2的两点A和B之间的距离AB=________,如果AB=2,则x的值为________.(4)若代数式|x+2|+|x﹣3|有最小值,则最小值为________.【答案】(1)(2)6(3);0或-4(4)5【解析】【解答】(1)综上所述,数轴上A、B两点之间的距离 (2)数轴上表示2和-4的两点A和B之间的距离 (3)数轴上表示和-2的两点A和B之间的距离如果,则的值为或由题意可知:当x在−2与3之间时,此时,代数式|x+2|+|x−3|取最小值,最小值为故答案为:(1);(2)6;(3),0或-4;(4)5.【分析】(1)发现规律:在数轴上两点之间的距离为这两点所表示的数的差的绝对值,故可求解;(2)根据(1),即可直接求出结果;(3)先根据(1)即可表示出AB;当AB=2时,得到方程,解出x的值即可;(4)|x+2|+|x-3|表示数轴上一点到-2与3两点的距离的和,当这点是-2或5或在它们之间时和最小,最小距离是-2与3之间的距离。
七年级上册英语易错题本页仅作为文档页封面,使用时可以删除This document is for reference only-rar21year.March七年级上册英语易错题英语错题本(七年级上册) 一.单项选择I the book for a week A. borrow ’s practise English now. A. speakme book next to the TV set and I also need pencil. A. a;the ;a ;a’s this in E nglish -It’s ruler. A. a C./you get me a piano ,Mum -There enough room for one in our we’ll try. C. isn’t ’tyou see science book on the desk -No,it’s English book. ;an ;an ;the ;thestudents. are is all all’s this - is an orange.had to go to hospital for x-ray. D./new sweater isn’t mine.Mine is old one. C. the D./’s ’d better your sweater. on D. dresspair of black shoe s my father’s.you have shoes. pair of14. is the population of Shandong Province. many much is wearing a blue sweater a Friday afternoon.your grandmother feel -She feels . ;happy B. does;happy C. do;happily D. does;happilythe dog of the door’s have a rest. Please . your books in your books about your books out your books aroundis different his brother-Nothing serious,but a bit tired -Better have a rest now,dear. that all there anything else ’s this ’s the matter with you21. -Is your toothache getting better -No,it’s . worst parents and I often have talks to exchange our ideas. you OK(找出与画线部分意义相近的词)you hot - . ,I’m ,I amn’t ,I’m not ,I am notlike vegetables. I like . ’t;fruits ’t;fruit ’t;fruit ’t;fruits’s fine today. How about out for a walk idea go’s this -It’s . fruit riceare they -They’re . rice fruit’s time go to bed.family often some cakes and milk.breakfast. ;for ;for ;for ;to’s time me lunch. ;to have ;to have ;ha ving ;havingmany do you keep fish’s that -I think Bill. ’s ’sare thirsty about some waterdrinkChinese often eat on our birthdays.答案:.1D 2B 3B 4A 5C 6A 7C 8A 9B 10B 11C 12A 13D 14D 15B 16D 17B 18A 19C 20D 21C 22D 23B 24C 25C 26C 27D 28B 29D 30B 31A 32A 33C 34 B 35C。
易错专题01七年级上册易错考点(一)学会学习1.如何正确认识学习?(如何打开学习之窗)①中学阶段,学习是我们的重要任务。
②初中阶段的学习,包括如何获取知识,培养能力以及学习如何做人;③学习不仅仅局限在学校,可以从一切经历中学习。
④学习需要自觉、主动的态度。
⑤学习没有终点、学习伴随着我们的成长。
2.怎样学会学习?①②③(学习有什么“秘籍”?)▲①学会学习,需要发现并保持对学习的兴趣。
②学会学习,需要掌握科学的学习方法。
③学会学习,需要善于运用不同的学习方式。
1.(2024上·河南洛阳)某学校组织学生开展“研学旅行”活动,但家长们对“研学旅行”活动却发出了不同的“声音”。
以下“声音”你不赞同的是()陷阱1:不能正确认识学习,以为学习就是学科学文化知识。
陷阱2:误认为只有在学校上课才是学习。
陷阱3:混淆学习方式与学习方法。
A.学习不仅局限在学校,研学旅行也是一种学习B.研学旅行能让学生开阔眼界,学到更多的知识C.研学旅行既浪费时间,又影响学习,得不偿失D.课堂学习是学生的主业,研学旅行是有益补充【答案】C【讲解】本题考查对学习的认识和理解。
ABCD:结合课本知识,学习不仅局限在学校,研学旅行也是一种学习;课堂学习是学生的主业,研学旅行是有益补充;研学旅行能让学生开阔眼界,学到更多的知识;研学旅行具有必要性,故ABD说法正确,C说法错误;本题逆向选择,故本题选C。
2.(2024上·贵州六盘水)以下同学的做法,你认为属于科学学习方法的是()A.小林上课喜欢读课外书,课后也不及时复习B.小明习惯制定学习计划,并总是按计划执行C.小金平时喜欢独自学习,不与同学交流讨论D.小吴一遇到问题,便马上去寻问同学和老师【答案】B【讲解】本题考查掌握科学的学习方法。
B:“制定学习计划、并总是按计划执行”是良好的学习习惯,能提高学习能力,故B正确;A:课前预习、上课认真听讲、课后及时复习才是科学的学习方法,故A说法错误;C:我们应与同伴合作学习,在交流中学习,而且合作学习属于学习方式,故C说法错误;D:我们要在自主学习中培养观察、想象、分析、推理等方面的能力,不能“马上去寻问同学和老师”,故D说法错误;故本题选B。
七年级上册数学全册单元试卷易错题(Word版含答案)一、初一数学上学期期末试卷解答题压轴题精选(难)1.如图,线段AB=20cm.(1)点P沿线段AB自A点向B点以2cm/秒运动,同时点Q沿线段BA自B点向A点以3cm/秒运动,几秒后,点P、Q两点相遇?(2)如图,AO=PO=2cm,∠POQ=60°,现点P绕着点O以30°/秒的速度顺时针旋转一周后停止,同时点Q沿直线BA自B点向A点运动,若P、Q两点也能相遇,求点Q运动的速度.【答案】(1)解:设x秒点P、Q两点相遇根据题意得:2x+3x=20,解得x=4答:4秒后,点P、Q两点相遇。
(2)解:①当点P.Q在OB与圆的交点处相遇时:P点运动所用的时间为:① (秒),P点的运动速度为:(20-4)÷2=8cm/秒②当点P,Q在A点处相遇时:P点运动所用的时间为:②(60+180)÷30=8(秒),P点运动的速度为:20÷8-2.5cm/秒【解析】【分析】(1)此题是一道相遇问题,根据相遇的时候,P点所走的路程+Q点运动的路程等于AB两地之间的距离,列出方程,求解即可;(2)分①当点P.Q在OB与圆的交点处相遇时,②当点P,Q在A点处相遇时两类讨论,分别根据路程除以速度等于时间算出P点运动的时间,即Q点运动的时间,再根据路程除以时间等于速度即可算出Q点的运动速度。
2.如图,OD平分∠BOC,OE平分∠AOC.若∠BOC=70°,∠AOC=50°.(1)求出∠AOB及其补角的度数;(2)请求出∠DOC和∠AOE的度数,并判断∠DOE与∠AOB是否互补,并说明理由.【答案】(1)解:∠AOB=∠BOC+∠AOC=70°+50°=120°,其补角为180°-∠AOB=180°-120°=60°(2)解:∠DOC= ×∠BOC= ×70°=35°,∠AOE= ×∠AOC= ×50°=25°.∠DOE与∠AOB互补,理由:∵∠DOE=∠DOC+∠COE=35°+25°=60°,∴∠DOE+∠AOB=60°+120°=180°,故∠DOE与∠AOB互补【解析】【分析】(1)由∠BOC、∠AOC的度数,求出∠AOB=∠BOC+∠AOC的度数,再求出∠AOB补角的度数;(2)根据角平分线定义求出∠DOC、∠AOE的度数,再由(1)中的度数得到∠DOE与∠AOB互补.3.如图,在数轴上A点表示数a,B点表示数b,AB表示A点和B点之间的距离,C是AB的中点,且a、b满足|a+3|+(b+3a)2=0.(1)求点C表示的数;(2)点P从A点以3个单位每秒向右运动,点Q同时从B点以2个单位每秒向左运动,若AP+BQ=2PQ,求时间t;(3)若点P从A向右运动,点M为AP中点,在P点到达点B之前:① 的值不变;②2BM﹣BP的值不变,其中只有一个正确,请你找出正确的结论并求出其值.【答案】(1)解:∵|a+3|+(b+3a)2=0,∴a+3=0,b+3a=0,解得a=﹣3,b=9,∴=3,∴点C表示的数是3(2)解:∵AB=9-(-3)=12,点P从A点以3个单位每秒向右运动,点Q同时从B点以2个单位每秒向左运动,∴AP=3t,BQ=2t,PQ=12﹣5t.∵AP+BQ=2PQ,∴3t+2t=24﹣10t,解得t=;还有一种情况,当P运动到Q的左边时,PQ=5t﹣12,方程变为2t+3t=2(5t﹣12),求得t=(3)解:∵PA+PB=AB为定值,PC先变小后变大,∴的值是变化的,∴①错误,②正确;∵BM=PB+,∴2BM=2PB+AP,∴2BM﹣BP=PB+AP=AB=12【解析】【分析】(1)根据非负数之和为,则每一个数都是0,建立关于a、b的二元一次方程组,解方程组求出a、b的值,再根据点C是AB的中点,因此点C表示的数为,列式计算可求出点C表示的数。
牛津译林版七年级上册期末易考易错能力题题精选精练一(建议时间40分钟,满分100)【复习出题范围7上UNIT(1-8)】班级___________姓名____________得分__________一、单项选择。
1.There is _________ “f” in the word “fix”.A. aB. anC. theD. 不填2.The Chinese people here always have a party_______ the Chinese New Year.A. celebrateB. to celebrateC. celebratingD. celebrates3.---_______ do we have for supper, dear?---Noodles with eggs.A. WhichB. WhereC. WhatD. How4. Dad, my shoes are old. I want to buy a new _______.A. shoesB. oneC. itD. pair5. The price of the TV is too _______, I don’t have enough money.A. muchB. highC. cheapD. expensive6.We are making a cake for my mother _______ a present for her birthday.A. forB. aboutC. asD. on7. The blue coat ________ cotton. It looks nice.A.is made inB. is made ofC. is made byD. is made from8. ---Millie, can you help me pick up the phone, please? I _______ the dishes.---I’m coming, Mom.A. washB. washingC. washesD. am washing9. ---Would you like _______ more cakes, David?---No, thanks. I’m full.A. muchB. manyC. someD. any10. Which of the underlined(画线)letter has a different sound from the other three?A. funB. studentC. clubD. but11. This is _______ car. It looks very beautiful.A. Kitty’s and SamB. Kitty and Sam’sC. Kitty’s and Sam’sD. Kitty and Sam12. Which word doesn’t have the sound /ɔi/A. boyB. toyC. buyD. toilet13.---Do you like TFBOYS?---Yes, their songs are _______ among the students.A. importantB. interestedC. specialD. popular14.---Let’s go to the zoo.---__________ I like animals very much.A. That’s a good idea!B. Sorry, I’m busy.C. No, I don’t like it.D. I’d love to, but I can’t.15. ---I am going to visit Nanjing Yangzi River Bridge with my family next month.---That sounds great! ________A. I’d like to.B. When will you go?C. Have a good time!D. How long will you stay there?单选:BBCDB CBDCB BCDAC二、填空。
初一第一学期英语易错选择题道HEN system office room 【HEN16H-HENS2AHENS8Q8-HENH1688】知识点习题can cal your English teacher 563-7853.are my !case3. my photos? They’re on the table.’s are ’s arebring some pens your school.door is the wall.this your bike? -No, . It’s bike.A this isn’t, Li Lei’s B. this is, Li Lei’sC. it isn’t, Li Lei’sD. it is, Li Lei’sare Fang Fang and Yuan Yuan.names namefootball us and many of my classmates it.A are good at; are good at B. are good for; are good forgood at; are good for D. is good for; are good atyou like this afternoon, Zhang Hua?-Of course! I ofen go at the weekend, you know.A swimming; swimming B. to swim; swimmingC. swimming; to swimD. to swim; swimthe parents love their children and my parents love .11.— your teachers kind to you?— Yes. And they teach .; good ; well ; good ; wellnews! Our English party is the afternoon of November 30.A./13.—Who to the dancing lesson after school?—Many of us .; do ; go ; goes ;does14.-What your uncle ? -Oh, he’s tall and thin. ; like ; look like ; look like ; likeswhite and milk also white.A. is; areB. are; isC. is ; isD. are; areis badly ill. He eats _____.A.little and little B.small and small C.less and less D.smaller and smalleris for children to play outside.A. happyB. happilyC. surprisedD. surprising18. The story happened a rainy night.19.People enjoy _____ in a house with a lawn and a garden.A. liveB. livesC. livingD. to live20.His mother _____ Chinese. A. says B. tells C. talks D.speaks?is?______room.?A. Lucy's?and?Lily's??B. Lucy's?and?Lily??C. Lucy?and?Lily??D. Lucy?and?Lily's?22.?We?are?ready?________?the?game?_______?the?weekend.?A.?for,?at??????B.?of,?in??????C.?at,?for???????D.?in,?of?is?a?football?match?________?Saturday?morning.?A.?on???????B.?at???????????C.?in?????D.?for?you?hot?????-?????.? A. Yes, I’m?? B. No,I? amn’t??C.No, I’m?not??D.Yes, I?am?not?’s?time?????me??????lunch.? A. for; to?have???B .to; to?have???C. for; having???D. to; having?door?is?? ?? ??the?wall?and?the?pictures?are??? ?? the?wall.?A. on; in???B. in; on???C. on; on???D. in; in?needs??? ??his?homework.?A. doing???B. to?do???C. do???D. does?? ????it?in?English.? A. say???B. speak???C. talk???D. took?likes?? ???in?china?very?much.? A. works???B. work???C. working???D. worker?is?the?way??? ??English?well.? A. learn???B. to?learn???C. learning???D. learns?。
牛津译林版七年级上册期末易考易错能力题题精选精练三(建议时间40分钟,满分100)【复习出题范围7上UNIT(1-8)】班级___________姓名____________得分__________一、听力15(略)二.单项填空(共15小题,每小题1分,满分15分)从A.B.C.D四个选项中,选出可以填入空白处的最佳选项.16. Simon looks smart purple.A. onB. ofC. withD. in17. Jackie Chan is a Kungfu superstar. He is among the people all over the world.A. modernB. beautifulC. interestingD. popular18. —Is the man on the left your English teacher?—No, he teaches Biology. His classes are fun.A. weB. ourC. usD. ours19. — do you do at Halloween?—We play games and have lots of fun.A. HowB. WhereC. WhatD. When20.—This pair of shoes looks nice. Can I , madam?A. try them onB. try it onC. try on itD. try on them21. —Can you help me when the train leaves?—Sure, Mr Green.A. look forB. look outC. look atD. find out22. —What’s your , Jimmy?—I like dancing to music.A. workB. nameC. hobbyD. age23. —The price of a HUAWEI Mate 9 Pro will be more than 4000 yuan.—Yes, good things always much.A. payB. spendC. takeD. cost24. —Where’s Lucy?—She volleyball with her friends.A. practises playingB. is practising playingC. practisng playingD. is practisng to play25. How many syllables(音节) does the word “lovely” have?A. One.B. Two.C. Three.D. Four.26. Trainers are for a long walk.A. matchingB. matchC. fitD. fitting27. —Mike, let’s go to the zoo now.—OK. Just a . Let me change my shoes.A. secondB. minuteC. hourD. day28. —How about the comic books? It’s $65.—I can’t take it. The price is too for us students.A. highB. cheapC. expensiveD. much29. —Good afternoon! ?—I’d like some basketball cards.A. Can you help meB. What can I do for youC. How are youD. What can I help you30. —Dad, I’m going for Jim’s birthday party. I’ll be back before 10:00.—A. Be careful.B. Come home early.C. Have fun.D. Really?二.单项选择(共15小题;每小题1分,满分15分)16-20 D D C C A21-25 D C D B B26-30 C B A BC三.完形填空(共10小题,每小题1分,满分10分)阅读下面短文,从短文后所给各题的四个选项(A.B.C.D)中,选出可以填入空白处的最佳选项.Food is important. Everyone needs to 31 well if he or she wants to have a strong body. Our minds also need a kind of food. This kind of food is 32 . We begin to get knowledge even when we are young. Small children are 33 in everything around them. They learn 34while they are watching and listening. When they are getting older, they begin to 35 science books, storybooks and anything else they like. When they find something new, they have to ask questions and 36 to find out the answers. What is the best 37 to get knowledge? If we learn 38 ourselves, we will get the most knowledge. If we are 39 getting answers from others and don’t ask why, we will never learn more and understand 40 . So we should believe in the saying that is never too old to learn.31. A. sleep B. read C. drink D. eat32. A. sport B. exercise C. knowledge D. meat33. A. interested B. interesting C. weak D. good34. A. everything B. something C. nothing D. anything35. A. lend B. write C. learn D. read36. A. try B. have C. think D. wait37. A. place B. school C. way D. road38. A. on B. with C. to D. by39. A. seldom B. always C. never D. sometimes40. A. harder B. much C. well D. better三.完形填空(共10小题;每小题1分,满分10分)31-35 D C A B D36-40 A C D B D四用动词的适当形式填空: 10’41.There is a wallet _____________ (lie) on the floor.42.—Who ________ (write) best in your class?—Mary does.43.Can we _____________ (ask) the policeman? He can tell you the way.44.It is bad for our eyes _____________ (read) in the sun.45.I don’t know what _____________ (wear)for the fashion show.46.At the moment the Green family________ (cook) for dinner together.47.Our teacher always asks us ___________(read) English in the morning.48.My mother asks me______ (go) home early.49.Let John _______________ (help) you to carry the bags.50.He wants me_______(wear) trainers.41-50 lying writes ask to read to wear are cooking to read to go help to wear五根据句意,用括号内所给单词的适当形式填空。
外研版初一年级上选择填空练习2006.12( )1.____ Han Meimei come from America?A. IsB. DoesC. DoD. Are( )2.____ Paul, what’s your name? A. I B. My C. I’m D. My name ( )3.____is English.____name is Alice.A. She, SheB. She, HerC. Her, SheD. Her, Her( )4.---What’s that? ---______ an English book.A. That’sB. This’sC. itsD. It’s( )5.Welcome the Americans ___ our city. A. at B. in C. to D. / ( )6. I have ____ new ball. Let’s play ____ football.A. a, aB. an, aC. an, /D. a, /( )7. I want ____ .A. to go to homeB. to go homeC. going homeD. go home ( )8.Where ____ Lucy ____ from?A. does, comesB. does, comeC. do, comeD. is, come( )9. There are some trees ____ our classroom.A. in frontB. in the front ofC. in front ofD. front of( )10. Who knows the way ____ her home?A. aboutB. toC. nearD. at( )11. They can’t see ____ flowers in the picture.A. someB. aC. anD. any( )12. ____ name of Lucy’s cat is Mimi. A. The B. A C. An D. Its ( )13. “Where is Tom?”“He’s at ___ school gate.”A. aB. anC. theD. /( )14. Tom is ____ brother.A. Lucy and Lily’sB. Lucy’s and LilyC. Lucy’s and Lily’sD. Lucy and Lily( )15. The cat is ____ the tree over there. A. on B. in C. at D. up ( )16. This is my ____ English book.A. friendB. friend’sC. friendsD. friends’( )17. That is ____ orange. ____ orange is orange.A. a, anB. an, AnC. an, TheD. the, a( )18. --- Is your friend a boy or a girl? --- ___________________.A. Y es, he isB. No, he isn’t.C. He is a boy.D. Y es, he is a boy. ( )19. How old ____ your teacher and how old ____ you?A. are, areB. is, areC. is , isD. are, is( )20. Is she _____ school today? A. / B. on C. in D. or ( )21. Is your mother a teacher ____ a worker?A. andB. butC. inD. or( )22. This is ____ father. It’s ______ old man.A. I, anB. my, anC. he, theD. his, the( )23. I’m ____ English. And I’m ____ English teacher.A. an, anB. an, /C. /, /D. /, an( )24. ---What class are you in ? ---I __________,A. in 2 ClassB. in class 2C. am in 2 classD. am in Class 2 ( )25. ____ name is Peter. A. He B. She C. His D. Him ( )26. There are many ____ on the grass.A. sheepsB. shipC. sheepD. sheepes( )27. ____ good friends.A. I and Jim areB. Jim and I areC. Jim and I amD. I and Jim is ( )28. There are three windows ___ the wall. A. in B. on C. of D. with ( )29. Y ou can see ____ orange in her desk.A. manyB. someC. twoD. an( )30. There ____ some money in her purse. A. be B. am C. is D. are ( )31. ---Is this Becky’s school bag? ---No, ____ school bag is in the desk.A. HisB. HerC. ItsD. My( )32. I would like ____ tennis with you.A. playB. playingC. playsD. to play( )33. Which sentence is right?A.How many re there apples on the table?B.How many apples are there on the table?C.How are there many apples on the table?D.How many apple are there on the table?( )34. ____ an English boy, ____ name is Tom.A. He’s, he’sB. He’s, hisC. He, HisD. His, he’s( )35. ____ they like their father?A. AreB. WouldC. DoD. Is( )36. ___ she want to go to the cinema? A. Does B. Do C. Are D. Is ( )37. He ____ to go to see a doctor.A. wantB. wantsC. doD. does( )38. I go to ____ work after ____ breakfast every day.A. /, theB. /, /C. the, aD. the, /( )39. Mr. Hu often runs ____ the morning, but ____ Sunday morning he doesn’t. A. in, in B. at, at C. on, In D. in, on( )40. I like English ____ it’s very interesting.A. andB. butC. soD. because( )41. His uncle likes ____ books.A.readsB. readingC. readD. to reads( )42. We watch the football ____ television. A. in B. on C. at D./ ( )43. The present is ____. A. Lucy and Lily B. Lucy’s and Lily’sC. Lucy’s and lilyD. Lucy and Lily’s ( )44.Lily with her mother ____ go shopping on Sundays.A. isn’tB. aren’tC. don’tD. doesn’t( )45. The girls ____ play basketball well.A. areB. canC. likeD. likes( )46.On my birthday, mother gives me a book ____ a birthday present.A. inB. asC. byD. with( )47. There is some ____ on the table.A. bananaB. chickenC. tomatoD. apple( )48. Are you good ____ drawing? A. at B. with C. for D.on ( )49. He ____ America and he is American.A.is come fromB. come fromC. comes fromD. are from ( )50. He often uses the Internet ____ their work.A. doesB. doC. to doD. doing( )51.This book is not ____. It’s ____.A. my, Jim’sB. me, JimC. mine , Jim’sD. mine, Jim ( )52.Here if a photo ___ my family. There are five people ___ my family.A. of, inB. of, ofC. for, inD. about, of( )53. Do you want ____ a computer?A. haveB. hasC. to haveD. to be( )54. ____ water would you like?A. How manyB. How muchC. How niceD. How old ( )55. ____ are in the same class, and ____ teacher is Tony.A. Their, theirB. They, theyC. They, theirD. They their ( )56. Please give ____ some flowers. A. his B. she C. them D. our ( )57.There is ____ “s” in the word “snake”. A. a B. an C. the D./ ( )58. I often go to see my father ____ Sunday morning.A. onB. atC. inD. for( )59. ____ the elephant ____ in the forest?A. Is, workB. Does, workC. Do, workD. Does, working ( )60. It’s time ____ class. Let’s go ____ the classroom.A. for, inB. for, toC. to, inD. to, into( )61. The girl ____ a red coat is Joy. A. in B. over C. on D.of ( )62. Y ou can ____ English, but can you ____ it in English?A. speak, speakB. speak, sayC. say, speakD. talk, tell ( )63.I don’t like singing ____ dancing. A. and B. but C. or D. so ( )64. Eating ____ food can keep ____.A.health, healthB. healthy, healthC. health, healthyD. healthy, healthy ( )65. We don’t like running. What about ____?A. swimsB. swimmingC. sleepD. play。