1. We have Chinese, English and some subjects.
2. Why don’t come here by bike?（改为同义句）
3.he likes to play football after class?（对画线部分进行提问）
4.she likes dogs, too.（改为否定句）
She dogs, too.
二、翻译下列短语：
1.向前直走：
2.你为什么不喜欢长颈鹿？you like giraffes?
3.你还喜欢其他什么书？
What do you like?
4、让汤姆做作业吧。
Tom do his homework
三、补全下列对话。
A： 1 at this monkeys. What’re they 2 ?
B：Bananas. 3 many monkeys can you see?
A：well, 4 count them. One,two,three…….oh, it’s too 4 .I can’t count them. B：right,they are running and jumping all the 6 .
A：let’go and see the pandas. I 7 one of them 8 a baby.
B：A baby panda? 9 ! let’s 10 .
1、2、3、4、5、
6、7、8、9、10、
四、阅读理解。（10分）
One day Einstein is walking in the street in new york. His friend meets him and says to him,”Einstein,you should buy a new overcoat. Look, how old your overcoat is!”
But Einstein answers,” it’s does n’t matter. Nobody knows me here.”
After a few years Einstein becomes a famous scientist. But he still wears the overcoat.
His friend meets him again and ask him to buy a new one. But Einstein says, “I needn’t wear a new one. Everyone kows me here.”
( )1. Einstein doesn’t want to buy a new one because .
A. he has no money
B. He likes the overcoat
C. nobody knows him
D. he doesn’t mind it.
一、根据首字母或汉语提示，完成下列单词。（10分）
1、Is there a library in your n
2. I want to be a police o
3. What s pizza do you like?
4. Go s and you’ll find the hospital.
5. My family (有时) go to the movies.
6. Jim swims (好)。
（）1、There is some cheese here. would you like?
A. how many
B. how much
C.what
D.how.
( )2. Can’t you hear ?
No, I can hear .
A.anything,nothing
B.anything, anything
C.something, nothing.
D.something, something ( )3. What time do you home?
A. get to.
B. arrive at
C.arrive in
D.get
( )4. One of the twins is watching TV, is playing football.
A.other
B.the other
C.others
D. another
四、同义句改写
1.What is your father?
your father’?
2.Turn left at the first crossing.
the first turning the left.
3.Why don’t you come with me to play games?
come with me to play games?
4.What’s the weather like today?
the weather today?
5.Can you tell me how I can get to the bookshop?
Can you tell me how to the bookshop?
五、补全下列对话。（5分）
A: 1 the weather like in England at this time of year?
B: It’s 2 .
A: I thought it was very warm. England 3 4 beautiful in many photos.
There are trees, grass and flowers 5 .
B: That’true. The weather is very good in summer. It’ 6 too hot. It’7 . A: I hear it’ often foggy.
B: Not now. but it’s rains a lot. And it’s quite cold February.
A: I see. When I visit England , I 8 go in February. By the way ,do you often talk about the 9 ?
B: Yes, quite true.
A: Why?
B: 10 the weather keeps changing all the time.
1、2、3、4、5、
6、7、8、9、10、
十、完形填空。（10分）
Of all the things we eat and drink, water is the 1 important.
Not 2 people understand this but it is quite true. The human body can go 3 food for a long time, but two 4 three days without water usually make people 5 .
Many people do not understand how 6 water the human body needs 7 well and many people do not drink 8 they’re thirsty
but often need more water, especially when they take exercise.
About 65~75% of a man’s body is water. If we do not have 9 water, we feel 10 and may become ill. Do you know what the best drink is? ( )A. least B.most C. many D. much
.( )A.few B.many C.much D lot of
( )A. on B.by C.with D with out
( )A. or B. and C.but Dof
( )A. to die B. dead C. died D.dies
( )A. little B. few C. many D much
( )A. to work B.work C.works D. working
( )A. that B.since C.then D when
.( )A. little B.all C. enough D.some
( )A. happy B.well C.fine D.tired.
十一、阅读理解
A
VISIT SW ANSEA ZOO
Come and see the India elephants and the new tigers from America. The bears are waiting to meet you, and the monkeys from china are waiting to throw things at you. The lovely dogs from Australia are waiting to laugh at you, the giraffes from brazil are waiting to look down on you.
Tickets opening time
Grown-ups:$2.00 9:00 a.m~4:00 p. m
Children:Over 12:$1.00 except Friday
Under 12:00free 10:00 a. m~ 3:00 p. m
Keep the zoo clean!
Do not touch, give food or go near the animals.
( )1.How many kinds of animals are talked about in the passage?
A. four
B.five
C.six
D.seven
( )2.Now Mr. Smith is in the zoo with his two sons, one aged 14 and the other 10, how much are the tickets togother?
A.$4.00
B.$2.00
C.$3.00
D.$1.00
( )3.which of the following is the visiting time?
A.8:30 a.m monday
B.9:30 a. m Friday.
C.3:00 p.m. Sunday.
D.5:00p.m Tuesday. ( )4.from the passage we can guess the animal “giraffe”must be very .
A. fat
B.long
C.strong
D.tall
( )5.which of the following can we do in the zoo
A.to give some food to the fish
B.to touch the monkey on the head.
C.to throw things verywhere.
D.to take a few nice photos.
B
Today is Sunday. My friend Lin Bin, Wang Xiaoming, Bei Feng and other two boys ask me to go swimming with them. Soon we get to the river. They are swimming in it, but I can’t. So I’m sitting under big tree and watching a little girl play with a ball by the river. But the ball falls into the water and soon she falls into the river, too.
I’m standing up and calling for help, but my friends are far from me and they can’t hear. So I jump into the river. I don’t know how to swim in it, but I take the girl out of the river. Her parents thank me very much. They say, “you are a good young pioneer.”When my friends know this, they all smile and say, “you can swim now.”
( )6.How many friends go to swim with the good boy?
A. five
B.six
C.four
D.seven
( )7.the good boy’s home is the river.
A.in
B.near
C.behind
D.far from. ( )8.the good boy is a .
A.young man.
B.little girl’s brother.
C.school boy.
D.the girl’friend. ( )9.what is the good boy doing after the girl fall into the river?
A. he is swimming in the river.
B.He is calling for help.
C.He is running by the river.
D.He is sitting under a big tree.
第一单元
一、根据汉语或首字母提示，完成下列单词。（10分）
1、I think maths is too (难的)。
2、China is an i place.
3、my b is in November.
4. would you like to go to the m with us?
5.my favorite s is English.
二、单项选择。
初一英语错题集集团标准化小组：[VVOPPT-JOPP28-JPPTL98-LOPPNN]
Unit 1 1 September is the n__________ month of a year. 2 M__________ 12th is Tree Planting Day. (植树节) 3 Lily and Lucy like listening to pop m_______________. 4 There are 12 m________________ in a year. 5 Let’s __________ (have) a soccer game. 6 Can they _____________(have) a soccer ball game? 7 The baby is five ______________(month) old. 8 Bob is active(活跃的) . He likes going to _____________(party) 9 Their _____________(birthday) are on June 5th. 10 Sally __________-(play) basketball after school every day. 11 May is the ________-(five) month and December is the _________-(twelve) month of a year. 12 This is his ____________(two) time to visit the park. 13 A______________ is the eighth month of a year. 14 Little James likes _____________(看) story books. 15 Miss Wang is a good teacher. Her __________(学生) all like her. 16 _____________Day is on June 1st. 17 This is my _____________(parent) room. It’s very big and bright. 18 I think the English t____________ is very easy . 19 We have a new English teacher this t__________. 20 We have some interesting ____________(thing) this month. 21 This is _____________(Jane) computer. 22 Hi, Peter. You look very ___________(happy) today. 1 She is eleven __________. A years B year-old C year’s old D years old 2 May is ________ month of the year. A fiveth B fifth C the fiveth D the fifth 3 The girl is ________ . Today is her _______ birthday. A twentieth; twenty B twenty; twentieth C twenty; twenty D twentieth; twentieth 4 You are _________ first good friend here.
九年级单项选择专练 C1. --- ____ do you study for a test? --- I study by listening to tapes. A. What B. Which C. How D. Where B2. I _____ really quiet. Now I’m very outgoing. A. use to be B. used to be C. use to D. used to A3. Ann ____ to choose her own clothes, but she isn’t allowed to get her ear pierced穿耳洞yet. A. is allowed B. allow C. allowed D. is allowing D4. ---What ___ you do if you had a million dollars? --- I’d give it to charity. A. will B. did C. were D. Would ①提出将来会发生的事：主句：主语＋would/should/might/could＋动词原形 从句：if+should＋动词原形/were to＋动词原形 eg. If he should go to Harvard University, he would make full use of his time. 如果他要上哈佛大学的话，他就会充分利用他的时间了。 ②提出现在的条件：主句：主语＋would/should/might/could＋动词原形 从句：if+动词过去式 eg. If he studied at this school, he would know the enviornment around the school very much. 如果他在这所学校学习的话，他会很了解周边环境。 ③提出过去的未发生的条件：主句：主语＋would/should/might/could have＋动词过去分词 从句：if+had＋动词过去分词 A5. --- Have you ever ____ another country? ---- Yes, I have. A. been to B. gone to C. be to D. went to B6. --- _____ would you like to go ? --- I’d like to go somewhere warm. A. Which B. where C. What D. How B7. He looks sad. Let’s ____ . A. to cheer him up B. cheer him up C. to cheer up him D. cheer up him C8. ----Jack,you look tired today. What’s wrong?
二次根式易错题集 一、二次根式的概念： 二次根式的性质： 1.()0≥a a 是一个非负数。 2.()02≥=a a a 3.()()???-≥==002 a a a a a a 错题： 1.=25 5 2.()=-23 －（－3）=3 3.()=--2 1255－1=4 4.() =2 63()5469632 2 =?=?或()=2 63()()5454632 2 2 ==? 5.() =-- 2 666-=-- 6.= -2 5 5151512 2=?? ? ??= 7.根据条件，请你解答下列问题：（1）已知n -20是整数，求自然数n 的值； 解：首先二次根式有意义，则满足,020≥-n 所以,20≤n 又因为n -20是整数，所以根号内的数一定是一个平方数，即n -20必定可化为()0,202≥=-a a a n 且为整数这种形式，即 ()0,202≥=-a a a n 且为整数。所以满足条件的平方数2a 有0，1，4，9，16。所以.4,11,16,19,20=n （2）已知n 20是整数，求正整数n 的最小值 解：因为n 20是整数，所以根号内的数一定是一个平方数，即n 20必定可化为()为整数a a n 220=这种形式，即()为整数a a n 220=，而()为整数a a n 25420??=，4可以开平方，剩下不能开平方的数5，所以正整数n 的最小值就是5，因2555=?能被开平方。所以我们要把常数先进行分解，把能开平方的数分解出来，剩下的不能开平方的数与字母相乘再配成能开平方的数，而字母的最小值就是这个不能 开平方的数。 7-2.(2)已知n -12是正整数，求实数n 的最大值； 解：因为n -20是正整数，所以满足,012 n -所以,12 n 所以根号内的数一定是一个平方数，即 n -20必定可化为()0,202 a a a n 且为整数=-这种形式，即()0,202 a a a n 且为整数=-。所以满足条件的平方数2a 有1，4，9。所以.3,8,11=n 最大值为11. 易错点：1.在计算或求值时，容易疏忽()0≥a a 是一个非负数。 2.在开方时，易出现()02 a a a =的错误。 3.二次根式的三个性质是正确进行二次根式化简、运算的重要依据。它们的结构相似，极易混淆，因此同学们必须弄清它们之间的区别与联系
1、左端已磨损的刻度尺，用它来测量教室的长和宽，测量结果是( ) A．偏大B．偏小C．一样D．无法确定 3．下面关于刻度尺的使用，说法正确的是（） A．使用刻度尺前，首先要观察刻度尺的零刻度线、量程和分度值B．没有零刻度线的刻度尺，不能用来测量物体 C．读数时，视线要与尺面垂直 D．测量时，刻度尺必须与被测物体的左端对齐 4在用刻度尺测量物体长度时，下列要求中做法错误的是（）A．读数时视线应垂直于刻度尺 B．测量时必须从刻度尺的零刻度线量起 C．测量时刻度尺不能歪斜 D．记录测量结果时必须在数字后面注明单位 下列长度的单位换算正确的是 A．9.6nm=9.6×10﹣3=9.6×10﹣3μm B．9.6cm=9.6×10mm=96mm C．9.6cm=9.6cm×10=96mm
D．9.6cm=9.6×100dm=0.096m 6. 用科学计数法表示：（写出单位换算过程） 7.2×10-7m= = μm 5×10-4 mm= = m 7×10-8 km= = m 3×10 8 m= = km 6×10 4μm= = m 36km/h= = m/s 5m/s= = km/h 1某人测量一物体的长度为1．568m，若他测量及记录都是准确 无误的，则测量的准确值是__________，估计值是___________。 2．某同学对一物体的长度进行了四次测量，分别记为：23.37cm，23.36cm，23.18cm，23.39cm，那么，最终这个物体的长度应视为（）A．23.325cm B．23.33cm C．23.373cm D．23.37cm 该刻度尺的分度值(即最小刻度)是__________， 3. 如图刻度尺的分度值为_________，该物体的长度为_________ ． 如图刻度尺的分度值为_________，该物体的长度为_________
中考英语单选各种难题易错题 A. What fine weather B. What a fine weather C. How a fine weather D. How fine a weather 解析：选A. 此题容易误选B. weather是不可数名词，前面不能有不定冠词。英语中经常考查的不可数名词有work, news, adivice, information等。 ( ) 2. Which is the way to the __________? A. shoe factory B. shoes factory C. shoe’s factory D. shoes’ factory 解析：选A. 此题极易误选B, C, D. 英语中名词单数可以修饰名词，如： an apple tree →two apple trees. 但注意 a man teacher→two men teachers。 ( ) 3. This class ________ now. Miss Gao teaches them。 A. are studying B. is studying C. be studying D. studying 解析：选A. 此题容易误选B. class, family, team等单词如果表示整体谓语就用单数，表示个体就用复数，从语境及其后面的代词them可以看出，class表示个体，故选择A。 ( ) 4. We will have a _________ holiday after the exam。 A. two month B. two-month C. two month’s D. two-months 解析：选择B 此题容易误选C, D. 在英语中数词中间用连字符号加名词单数，构成符合名词，在句中只能作定语，如果选择C, 需要把逗号放s后面。 ( ) 5. There is no enough ________ on the corner to put the table。 A. place B. room C. floor D. ground 解析：选B. 此题最容易误选A.。 room在句中是空间而非房间。句意：角落里没有摆桌子的空间了。 ( ) 6. We can have _____ blue sky if we create _____ less polluted world。(苏州2010) A. a; a B. a; the C. the; a D. the; the 解析：选A. 此题容易误选C, D. 根据句意：如果我们创造一个没有污染的世界，那么我们就用一个蓝色的天空。
一、选择题 1．下列二次根式中是最简二次根式的为（ ） A ．12 B ．30 C ．8 D ． 12 2．下列计算正确的是（ ） A ．93=± B ．8220-= C ．532-= D ．2(5)5-=- 3．在函数y= 2 3 x x +-中，自变量x 的取值范围是（ ） A ．x≥－2且x≠3 B ．x≤2且x≠3 C ．x≠3 D ．x≤－2 4．如图，是按一定规律排成的三角形数阵，按图中数阵的排列规律，第9行从左至右第5 个数是（ ） 1232567 22 310 A ．210 B ．41 C ．52 D ．51 5．实数a ，b ，c ，满足|a |+a =0，|ab |=ab ，|c |-c =0，那么化简代数式2b -|a +b |+|a -c |-222c bc b -+的结果为（ ） A ．2c -b B ．2c -2a C ．-b D ．b 6．下列二次根式中，与3是同类二次根式的是（ ） A ．18 B ． 13 C 24 D 0.3 7．设0a >，0b >( 35a a b b a b =23ab a b ab ++的值是 （ ） A ．2 B ． 14 C ． 12 D ． 3158 8．下列计算正确的是（ ） A 1233= B 235= C ．43331= D ．32252+= 9．给出下列化简①（2-）2=222-=（）2221214+=3
1 2 =，其中正确的是（ ） A ．①②③④ B ．①②③ C ．①② D ．③④ 10．下列运算一定正确的是( ) A a = B = C ．222()a b a b ?=? D ()0n a m = ≥ 二、填空题 11．已知x =( )21142221x x x x -??+?= ?-+-??_________ 12．若0a >化成最简二次根式为________． 13．若m m 3﹣m 2﹣2017m +2015＝_____． 14．定义：对非负实数x “四舍五入”到个位的值记为()f x z ， 即：当n 为非负整数时，如果11 22 n x n -<+≤，则()f x n =z ． 如：(0)(0.48)0f f ==z z ，(0.64)(1.49)1f f ==z z ，(4)(3.68)4f f ==z z ， 试解决下列问题： ①f =z __________；②f =z __________； + =__________． 15．3 =，且01x <<=______． 16．甲容器中装有浓度为a ，乙容器中装有浓度为b ，两个容器都倒出m kg ，把甲容器倒出的果汁混入乙容器，把乙容器倒出的果汁混入甲容器，混合后，两容器内的果汁浓度相同，则m 的值为_________． 17．把 18．=== 据上述各等式反映的规律，请写出第5个等式：___________________________． 19．a ，小数部分是b b -=______. 20．1 =-=
科学七年级(上)各章易错题集 衢江区莲花初中黄紫仙 第一章 1.一罐普通的可口可乐或雪碧易拉罐的体积最接近（） Ａ.３５０升Ｂ.３５０毫升Ｃ.３５升Ｄ３.５毫升 ２.关于质量，下列说法中正确的是（） Ａ.体积大的物体质量也大Ｂ.物体从地球送上月球质量不变 Ｃ.物体的温度升高时质量会增大Ｄ.水结成冰后质量会增大 3、下图所示的四个图中,能正确测出圆柱体截面直径的方法是（） 4．某同学要称取50克水，操作方法曾经做过以下几步：(1)称量一只100ML的烧杯质量为m (2)加水到天平平衡(3)调节天平平衡(4)再在右盘加50克砝码(5)拿下烧杯整理天平。其中正确的操作顺序是( ) A．（1）（2）（3）（4）（5）B．（3）（2）（1）（4）（5）C．（3）（1）（4）（2）（5）D．（1）（5）（3）（2）（4）5．托盘天平在称量时若右盘稍上翘，则表示（） A．砝码的质量比物体的质量大，应向左移动游码。 B．砝码的质量比物体的质量大，应向右移动游码。 C．砝码的质量比物体的质量小，应向左移动游码。 D．砝码的质量比物体的质量小，应向右移动游码。 6．感受身边的物理——质量为1.5×106mg的物体最可能的是（） A．一只母鸡B．一头大象C．一头奶牛D．一只蚊子 7．用托盘天平称量物体的质量时，将被称物体和砝码放错了位置，若天平平衡时，左盘放有100克和50克的砝码各1个，游码所对的刻度值是6克，则物体的质量为（）A．156克B．150克C．144克D．154克 8. 用皮尺测量长度是，如果皮尺没有充分拉直来测量，那么测量结果将( ) A．偏大B．偏小C．不受影响D．不能确定 9．有一支温度计刻度不准，将温度计放在冰水混合物中示数是-3℃，放在一标准气压下的沸腾的水中的示数为97℃，若放在室内空气中示数是20℃，则室内空气的实际温度是（）A．17℃B．20℃C．23℃D．19.2℃ 10、一只温度计刻度均匀但示数不准，在一个标准大气压下，将它放入沸水中示数为 95℃；放入冰水混合物中，示数为5℃；把该温度计悬挂在教室的墙壁上，其示数为32℃。教室的实际温度是（） A、27℃ B、30℃ C、32℃ D、37℃ 11、小明有一支特殊的温度计，它的刻度是均匀的，但读数不够正确，在冰水混合物中的读数是40C，放在1标准大气压下的沸水里的读数是960C，用这支温度计测一杯水的读数为200C，你能帮他算算这杯水的实际温度吗？（） A、160C B、17.40C C、18.40C D、240C 12、某同学用体温计给一位生病的同学量体温,结果读数为38.４℃,该同学在未甩的情况下, 又用该温度计分别给生病的甲．乙．丙三位同学量体温，测得结果：甲为38.４℃,乙为 39.6℃,丙为39.6℃,则( ) A．只有甲的正确B．.只有乙的正确 C．只有丙的正确D．.乙肯定正确,甲和丙也可能正确
英语单选易错题(二) 1.I’d like to live somewhere ____ the sun shines all year long. A. which B. that C. where D. in which 2.I ______ to go for a walk, but someone called and I couldn’t get away. A. was planning B. planned C. had planned D. would plan 3. —Did you go to Qingdao for vacation last summer? —I_________ to go, but I got sick at the last minute. A. planned B. was planning C. had been planning D. have planned 4.—We are informed that the Weifang International Kite Festival starts at 7:00. —Oh, I didn’t expect it was so early! I ______ to go out for dinner with my friends first. A. was planning B. am planning C. have been planning D. have planned 5. —I didn’t do well in the exam. What about you? — I did _____ you. Maybe even worse. A. not better than B. not worse than C. as well as D. no better than 6. If you _____ the medicine you _____ better now. A. took ; would feel B. had taken ; felt C. had taken ; would feel D. took ;would have felt 7. —Your book, Tommy? —No, Mom, it’s my friend’s. —Remember to return it to ____ name is on it. A. what B. which C. whose D. whosever 8. — I hope you enjoyed the film last night. — How on earth do you know I went to a film? I _____ you. A. won’t tell B. didn’t tell C. haven’t told D. hadn’t told 9. Gone forever ____ when we used foreign oil. A. the days are B. the days were C. are the days D. were the days 10. They waited and waited. _____ they had been looking forward to. A. Then the hour came B. The hour then came C. Then came the hour D. Then did the hour come 11. He must have finished the work by the end of last month, ___________? A. hasn’t he B. didn’t he C. hadn’t he D. mustn’t he 12. Be careful with such things. If you _____, you’ll drop them. A. don’t B. aren’t C. won’t D. do 13. ___________ a fine day, Shenzhou VI will be launched on time according to its planned time. A. Being B. It being C. To be D. It is 14. It will be five years ______ we meet again. A. since B. after C. before D. when 15. — Did you scold him for his mistake? — Yes, but _____ it. A. I’d rather not do B. I’d better not do C. I’d rather not have done D. I’d better have not done 12. We Chinese can work wonders, that is, we can make ____. A. impossible possible B. the impossible possible C. impossibly possible D. the impossible possibly 13. Whether we’ll hold the sports meet depends on the weather, _____?
《二次根式》易错题集 易错题知识点 1．忽略二次根式有意义的条件，只有被开方数 a≥0时，式子a才是二次根式；若a<0，则 式子a 就不能叫二次根式，即 a 无意义。 2．易把 2 a与2) (a混淆。 3．二次根式的乘除法混合运算的顺序，一般从左到右依次进行或先把除法统一成乘法后，再用乘法运算法则计算。 4．对同类二次根式的定义理解不透。 5．二次根式的混合运算顺序不正确。 典型例题 选择题 1．当a＞0，b＞0时，n是正整数，计算的值是（） A．（b﹣a）B．（a n b3﹣a n+1b2）C．（b3﹣ab2）D．（a n b3+a n+1b2） 考点：二次根式的性质与化简。 分析：把被开方数分为指数为偶次方的因式的积，再开平方，合并被开方数相同的二次根式． 解答：解：原式=﹣ =a n b3﹣a n+1b2 =（a n b3﹣a n+1b2）． 故选B． 点评：本题考查的是二次根式的化简．最简二次根式的条件：被开方数中不含开得尽方的因式或因数． 2．当x取某一范围的实数时，代数式的值是一个常数，该常数是（）A．29 B．16 C．13 D．3 考点：二次根式的性质与化简。 分析：将被开方数中16﹣x和x﹣13的取值范围进行讨论． 解答：解：=|16﹣x|+|x﹣13|， （1）当时，解得13＜x＜16，原式=16﹣x+x﹣13=3，为常数； （2）当时，解得x＜13，原式=16﹣x+13﹣x=29﹣2x，不是常数； （3）当时，解得x＞16；原式=x﹣16+x﹣13=2x﹣29，不是常数；
（4）当时，无解． 故选D 点评：解答此题，要弄清二次根式的性质：=|a|，分类讨论的思想． 3．当x＜﹣1时，|x﹣﹣2|﹣2|x﹣1|的值为（） A．2 B．4x﹣6 C．4﹣4x D．4x+4 考点：二次根式的性质与化简。 分析：根据x＜﹣1，可知2﹣x＞0，x﹣1＜0，利用开平方和绝对值的性质计算． 解答：解：∵x＜﹣1 ∴2﹣x＞0，x﹣1＜0 ∴|x﹣﹣2|﹣2|x﹣1| =|x﹣（2﹣x）﹣2|﹣2（1﹣x） =|2（x﹣2）|﹣2（1﹣x） =﹣2（x﹣2）﹣2（1﹣x） =2． 故选A． 点评：本题主要考查二次根式的化简方法与运用：a＞0时，=a；a＜0时，=﹣a；a=0时，=0；解决此类题目的关键是熟练掌握二次根式、绝对值等考点的运算． 4．化简|2a+3|+（a＜﹣4）的结果是（） A．﹣3a B．3a﹣C．a+D．﹣3a 考点：二次根式的性质与化简；绝对值。 分析：本题应先讨论绝对值内的数的正负性再去绝对值，而根号内的数可先化简、配方，最后再开根号，将两式相加即可得出结论． 解答：解：∵a＜﹣4， ∴2a＜﹣8，a﹣4＜0， ∴2a+3＜﹣8+3＜0 原式=|2a+3|+ =|2a+3|+ =﹣2a﹣3+4﹣a=﹣3a． 故选D． 点评：本题考查的是二次根式的化简和绝对值的化简，解此类题目时要充分考虑数的取值范围，再去绝对值，否则容易计算错误． 5．当x＜2y时，化简得（）
七年级下册学生易错题集锦 班级：姓名：得分： 1. Bob can play __________ tennis but can’ t play __________ violin. A. the ; the B. /;/ C. the; / D. /; the 2.----Can you speak French? ---Yes, but only___________. 3.Maybe you can __________ our school concert. 4.He can __________, so he wants to join the __________ club. A. Swims; swim B.swims; swimming C.swimming; swim D. swim; swimming 5.---__________ your friend play the guitar? --- Yes, he __________. A. Do; do B. Is; is C. Can; can D. Can; can’ t 6.They are talking __________ my parents __________ my study. 7.__________ like to go swimming __________ summer. 8.---Can you sing__________ dance? ---I can sing. A. But B. or; C. and D. then 9．–It ’ s __________ hard work to achieve a balance between schoolwork and hobbies. – So it is, but we have to. A. a B. an C. the D./ 10.Tell me and I ’ ll forget. Show me and I _________not remember. Let me try and I ’ ll understand. A. can B. may C. must D. will 11. — Dad, must I finish my homework today? — No, you__________. You may do it tomorrow. A. needn ’t B. mustn ’ t C. don ’ t D. won ’ t 12. Which do you prefer to use to keep in touch with your friends, __________ WeChat？ A. or B. and C. so D. but 13. my mother is good __________old people. She talks to them and makes them happy. A. at B. for C. with D. of 14. Can you play__________ guitar at eight__________ Saturday night? A. /; on B. the; in C./;/ D. the; on 15. Ben usually goes __________at 5:30 p.m. A. to home B. home C. at home D. for home 16. Don ’ t play __________ the cat anymore. It ’ s time __________ you to do the
浙教版科学错题集8——地球与宇宙(1-4节) 七（）班姓名学号家长签名 【A组基础巩固题】 1．[2012·杭州]太阳活动可直接造成地球上发生的下列现象是(D) A．酸雨B．温室效应C．火山喷发D．短波通讯中断 2．早晨我们迎着太阳走，我们四周方位应是(B) A．前南后北左东右西B．前东后西左北右南 C．前西后东左南右北D．前东后西左南右北 【解析】早晨迎着太阳走，就是面朝东，背朝西，按顺时针方向为东南西北。 3．太阳的大气层从内到外依次是(B) A．光球层日冕层色球层B．光球层色球层日冕层 C．日冕层色球层光球层D．日冕层光球层色球层 4．下面各种现象中，可能是由于太阳的活动对地球产生影响的是(B) A．冬季平均气温升高的“暖冬”现象B．两极地区出现磁暴和极光现象 C．山区的手机信号不好，出现通话中断现象D．某山区出现大面积山体滑坡现象4．[2013·无锡]太阳黑子数量增多时，对地球上的影响是 ( D ) A．可见光明显减少 B．造成天气异常变化C．干扰无线长波通讯 D．紫外线大大增多【解析】黑子是太阳表面由于温度较低而显得较暗的气体斑块。太阳黑子的多少和大小，往往作为太阳活动强弱的标志。太阳活动对地球的影响很大。当太阳黑子数量增多时， 表示太阳活动增强，会导致太阳光中的紫外线大大增多。太阳活动除了黑子外，还有耀 斑、日珥、太阳风等。太阳活动增强时，太阳黑子数量增多。耀斑爆发时，释放出更巨 大的能量。太阳风增强时，可以影响地球上的短波通讯。根据以上分析，选项A、B、C 是错误的，本题答案是D。 5．2009年为太阳黑子极少的一年(谷年)，下一个太阳黑子谷年将出现于( B ) A．2019年B．2020年 C．2021年D．2022年 【解析】太阳黑子活动周期大约为11年。 6．请您判断下列哪些生活片段是宇航员在月球上的真正记录， A．吃到土生土长的食物（） B．跳过4米高的横杆（） C．举起200千克的大石头（） D．听大风呼啸（） E．脱掉宇航服，在被窝里睡觉（） F．拍一张照片（） G．袋鼠式走路（） H．放风筝（） I．扔石头（） J．游泳（） K．宇航员可以在月球上看到漫天大雪( ) L．从月球上看天空是蔚蓝色的( ) M．流星现象( ) N．植树造林( ) O．白天和晚上的温差可以达到数百摄氏度( )P．陨石坑( ) Q．开露天音乐会( ) 7．[2012·咸宁]下列现象与地球自转密切相关的是 ( A ) A．早穿皮袄午穿纱，晚围火炉吃西瓜 B．雪暗凋旗画，风多杂鼓声 C．停车坐爱枫林晚，霜叶红于二月花 D．采菊东篱下，悠然见南山
1. That was not the first time he us. I think it’s high time we _strong actions against him.(2005) A. betrayed…take B. had betrayed…took C. has betrayed…took C. has betrayed…take 答案：C 解析：根据前半句句意，我们知道“背叛”不知发生一次，尽管行为发生在过去，但由后半句句意可知，其结果是现在仍处于被“背叛”的情形，与现在仍有关系，故用现在完成时。 2. “It seems that she was there at the conference.” The sentence means that _. .(2009) A. she seems to be there at the conference. B. she seemed to be there at the conference. C. she seems to have been there at the conference. D. she seemed to being there at the conference. 答案：C 解析：本题考查半助动词It… that…结构的转换，过程中动词结构的对应如下： Sb. Seems to do/ be doing/have done It seems that sb. Does/is doing/ was doing
3.I doubt _he is the murderer because he is not on the scene at that moment. A. why B. that C. whether D. when 答案：B 解析：在肯定句中，及物动词doubt后面也可接that引导的宾语从句，但表示疑虑或”不大相信’. 4.Bit by bit, a child makes the necessary changes to make his language _. A.as other people B.as other people’s C. like other people D. like other people’s 答案：D 解析：as 和like 都可以表示“像……一样”，但as是连词，后跟从句，like是介词，后跟名词或名词性短语。 5. There is a real possibility that these animals could be frightened, _a sudden loud noise. A. being there B. should there be C. there was D. there have been 答案:B 解析：该句是一个省略if的倒装的虚拟条件句，课还原为“if there should be…”,表示对将来的假设。
二次根式单元 易错题难题质量专项训练 一、选择题 1．下列计算正确的是( ) A ．235+= B ．3223-= C ．623÷= D ．(4)(2)22-?-= 2．下列式子为最简二次根式的是（ ） A ．22a b + B ．2a C ．12a D ．12 3．下列根式是最简二次根式的是（ ） A ．4 B ．21x + C ．12 D ．40.5 4．若a 是最简二次根式，则a 的值可能是（ ） A ．2- B ．2 C ．32 D ．8 5．对于所有实数a ，b ，下列等式总能成立的是（ ） A ．()2b a b a +=+ B ．22222(b a b )a +=+ C ．22b a b a +=+ D ．2(b)a b a +=+ 6．已知实数a 在数轴上的位置如图所示，则化简2||(-1)a a +的结果为（ ） A ．1 B ．﹣1 C ．1﹣2a D ．2a ﹣1 7．下列根式中，最简二次根式是（ ） A ．13 B ．0.3 C ．3 D ．8 8．下列二次根式是最简二次根式的是( ) A ．12 B ．3 C ．0.01 D ．12 9．下列各式计算正确的是（ ） A ．6 232126()b a b a b a ---?= B ．（3xy ）2÷（xy ）=3xy C ．23a a a += D ．2x ?3x 5=6x 6 10．已知a 满足2018a -＋2019a -＝a ，则a －2 0182＝( ) A ．0 B ．1 C ．2 018 D ．2 019 11．若a 、b 、c 为有理数，且等式 成立，则2a ＋999b ＋1001c 的
英语经典错题集锦 1、Some pears ( )on the table . Some water ( )in the cup. A are ;are B is ; are C. is ; is D are ; is 2. Jack ( ) like baseball ( ) volleyball. A. don’t ; or B. doesn’t ; or C. don’t ; and D. doesn’t ; and 3. Eric’s math is ( ),and he can play the piano very ( ). A. good ; good B. well ; well C. well ;good D: good ;well 4. Kate , let’s ( ) friends ,OK? A. do B. be C. has D. gets 5. Now , everyone , please turn to Page ( ) and look at the ( ) picture . A. Twelve ; fifth B. Twelfth ; fifth C. Twelve ; five D. Twelfth ; five 6．My Chinese friends would like to talk with me ( ) English. A. with B. on C. in D. for 7. We have English ,P.E and math_______the morning of Monday. A. in B. on C. at D. with 8.My father often watches TV for ______ hour in the evening . A. a B. an C. the D./ 9. ----__________________. ----Yes ,They are my favorite days. A.What are my favorite days? B.Do you like Saturday and Sunday. C.What about your favorite days? D.How about Saturday and Sunday. 10. I am ________now .I can help you.
如对你有帮助，请购买下载打赏，谢谢！ 第一章 1、关于温度的说法中正确的是（） A、凭手的感觉可以准确判断物体的冷热 B、20℃的铁块比20℃的木头温度低些 C、用体温计可以测冰水或沸水的温度 D、体温计横截面近似于一个三角形，对液柱有放大作用，便于读数 选：D 2、教学楼过道的消防栓箱的玻璃经常被同学不小心损坏，所以同学们下课时请不要在走廊奔跑、打闹。那么在配破损的玻璃时，用下列哪种刻度尺比较好（） A、最小刻度1毫米的2米长的钢卷尺 B、最小刻度1厘米的1.5米长的皮尺 C、最小刻度1毫米的学生用三角尺 D、最小刻度1厘米的30米长的皮尺 选：A 3、某同学用毫米刻度尺测量某一物体的长度时，测得的五次数据是2.42厘米，2.43厘米， 2.42厘米，2.44厘米，2.64厘米，其中有一次测量是错误的，则正确的测量结果应该是（） A、2.42厘米 B、2.428厘米 C、2.43厘米 D、2.47厘米 选C 4、为了测出细铜丝的直径，某同学把铜丝在铅笔上紧密排绕32圈，如图所示，用分度值是1 mm的刻度尺测得这32圈的总宽度为________mm，可算出细铜丝的直径约为________mm。若在数匝数时少数了1匝，则测量值比真实值要偏；若在绕线时匝与匝之间有间隙，则测量值比真实值要偏。 5、测量液体体积时，量筒必须放在，若是凹形液面，读数时视线要与相平。如右图，量筒的量程是mL，最小刻度为，小石块的体积为cm3。 6、判断下列测量数据：0.3260米，7.59米，759毫米，759分米，各自对应的刻度尺的最小刻度是（） A、分米、毫米、厘米、米 B、厘米、分米、毫米、米 C、毫米、厘米、分米、米 D、毫米、分米、厘米、米 选：D 7、如右图，小明同学用量筒测量液体体积时仰视读数，则测量的结果（） A、偏大 B、偏小 C、不受影响 D、无法确定 选：B 8、小明测量烧杯中热水温度时，将很少的热水倒入另一烧杯中，然后像如图所示的那样去测量和读数，他这样做小东找出了一些错误，但有一条找的不对，请你把它挑出来（） A、不应该倒入另一烧杯，这会使温度降低 B、水倒得太少，温度计玻璃泡不能完全浸没 C、读数时，视线应该与刻度线相平，而不应斜视 D、应该将温度计取出读数，而不应该放在水中读数 选：D 9、在一标准大气压下，某温度计放在冰水混合物中时，水银柱长度为4cm，放在沸水中时，水银柱长度为24cm，当它去测量一杯水的温度时，水银柱的长度为14cm，则这杯水的温度为（） A、30℃ B、50℃ C、70℃ D、90℃ 选：B