杨浦培训班杨浦初升高补习班新王牌资料七年级复习

杨浦培训班杨浦初升高补习班新王牌资料七年级复习
杨浦培训班杨浦初升高补习班新王牌资料七年级复习

春季班辅导材料—14

期末考试复习专题:二:语音

一)根据音标写单词:

1. I felt _____ to hear the news. /dis?’p?intid/

2. The poor man looked _____ at his wife. /s?dli/

3. The ______ is dropping these days. /’ tempr?t?? /

4. I would be _____ to walk in the rain. /?:ful/

5. It’s _____ of you to do such a thing. /sili/

6. She looked happy when she ______ the news. /h?:d/

7. The summer _____ are coming soon. /’h?l?di/

8. In winter he _____ in his warm house. /steid/

9. _______ he is old, he still keeps learning. /?:l’e?u/

10. It’s a ______ between us. /’si:krit/

11. The artist _____ his name in the corner of the painting. /Saind

12. Send my best wishes to _______ in the family. /’evriw?n/

13. The little boy is ____ to draw a nice picture. / Eibl/

14. This is the beginning of a new __________. /’ sent??ri/

15. _____ there will be not enough food for everyone. /p?’h?ps/

16. The students are talking about their _______ life. /fju:t??/

17.People in different countries speak different ________. /’l??gwid?iz/

18. The ______ can do much work for us. /’ r?ub?t/

19. Air pollution in some big cities is ___________. /’terib?l/

20. Do you want a more ______ school life? /in’d??i?bl/

21.The engineer is designing a new _________[m???i:n]

https://www.360docs.net/doc/7f13046164.html,st Spring Festival ,some of my _______[?p?k?t]money came from Wechat red envelopes.

23.As a student,she ________[?s?:tnli]knows how to help her students,

24.Jack is getting taller,now he wears size large ,not ________[?mi:di?m] .

25.Keeping a _______ [?da??ri] is a good habit for students.

二):Which of the following underlined parts is different in pronunciation from the others:

1. A. There is no reason for him to refuse me. B. The little girl in red is so cute.

C. Don’t judge a person by his clothes.

D. You can use my computer if you want.

2. A. It was snowy and windy. B. What was the lowest temperature then

C. Writing things down is important.

D. The wind blows the clouds.

3. A. I hope you can believe me. B. Luckily, nobody died in the accident.

C. Who is the chief of your team?

D. I bought a piece of furniture yesterday.

4. A. It was cold last night. B. She gave a quiet cough to attract my attention.

C. Smoking is a big cause of death.

D. I had a meal of bread and cheese last night.

5. A. My diet is made up of rice and vegetables. B. The food finally arrived.

C. This is really surprised me.

D. This jacket fits him quite well.

6. A. My father used to be a lawyer. B. All you have to pay for are breakfast and dinner.

C. He is a football player.

D. Now for the second wave.

7. A. A little house is among the trees. B. He is at law college.

C. The main problem is unemployment.

D. This may not be possible.

8. A. I prefer to walk along the street. B. We should eat less unhealthy food.

C. I have a terrible headache.

D. Jenny didn’t feel good about herself.

复习专题:三:Complete the following passage with the words or phrases in the box. Each can only be used once (将下列单词或词组填入空格。每空格限填一词,每词只能填一次):

A

A. rise

B. in charge of

C. offered D .good E. high F. visited G. moved to

Kate was born in north England and when she was eight years old her family__1__London.When Kate was young,her mother told her,“If you work hard,you will be successful.”Kate was a bright student.She studied hard and always got__2__marks in Maths,Histoty,French,Science,and Geography.Kate was also__3__at Spanish,Japanese and Chinese.Her grammar and pronunciation were very good.She wasn’t afraid to make mistakes and she made progress day by day.

After she graduated from university,Kate worked in a large computer company.She worked well and the company was satisfied with her.Every year she got a__4__.

After some time she was sent to Japan and she was responsible for the sales there.She worked in Japan for five years. Then she became the manager__5__.the sales in Asia and she had a lot of experience as a manager.

Kate left the company because another company__6__.her a job.She likes the new job because she enjoys living in Hong Kong.

B

A.feels

B. funniest

C. talking

D. reason

E. largest

F. fighting

The movie Big Hero 6 《超能陆战队》has won the hearts of people of all ages. The biggest___1____for its success is the film’s lovely robot, Baymax(大白).The robot begins the story as a healthcare assistant(健康助手)and ends it as a powerful superhero. So you want to know more about him? Baymax looks funny when his battery is low

One of the ___2___scenes in Big Hero 6 is when Baymax’s battery (电量)is low. At that time, he has trouble walking and __3_____.He can repair himself

As a robot , Baymax ____4____no pain. He can fix himself .All he needs is some Scotch Tape(透明胶带). He makes a pretty great superhero. After he gets upgraded (升级)by his friend, Hiro, Baymax becomes a powerful____5____machine.He can fly around in the sky and beat enemy.

C

A.wish

B. Something

C.takes

D.alone

https://www.360docs.net/doc/7f13046164.html,zy

F.brings

Do you remember Po(阿宝),the lovely Kung Fu panda(功夫熊猫)?Now he is back with a New Year gift for us: a new movie!

In the movie, Po’s panda father reappears. He___1____Po to his birthplace. There are many pandas living in it, but they are all very____2____.TO Po’s surprise, he doesn’t.

However, tht’s not the worst part. A bad guy called Kai comes to China. He begins to defeat Kung Fu masters in the country,and steal their powers. Powers. Po must do____3____to protect his hometown. But he is not able to fight against the bad guy_____4____, so he should learn to train a village of lazy pandas to becom a of Kung Fu Pandas!

Can he complete hioa mission(任务)?Let’s_____5______ him good luck

D

horse. It took days, weeks and sometimes months for people to ___1____ news. Now it is possible to send words and pictures around the world in seconds. Billions of people learn about news stories of their own country and all over the world every day, either by watching TV or reading newspapers.

Newspapers have been an important ___2____ of everyday life since the 18th century. Many countries have hundreds of different newspapers. How do newspaper editors decide which news stories to print? Why do they print some stories and not others? What makes a good newspaper story?

Firstly, it is important to report new stories. TV ___3_____ can report news much faster than newspapers. Yet, newspapers give more about the same story. They may also look at the story in another way, or they may print completely different stories to those on TV.

Secondly, a news story has to be interesting and ____4____. People don’t want to read stories about everyday life. As a result, many stories are about some kind of danger and seem to be “bad”news. ___5_____, newspapers never print stories about planes landing safely, instead, they print stories about plane accidents.

____6____, many people are interested in news in foreign countries, but more prefer to read stories about people, places and events in their own country. So the stories on the front page in Chinese newspapers are usually very different from the ones in British, French and American newspapers.

复习专题:四:Rewrite the following sentences as required(根据所给要求.改写下列句子。每空格限填一词):

1.Jessica has an English lesson at 8:10 on Monday morning. (改为反意疑问句)

Jessica has an English lesson at 8:10 on Monday morning, ______ ______?

2.One-third of the boy students like playing football.(对划线部分提问)

_____ ______boy students like playing football?

3.The little cat looks very pretty.(改为感叹句)

_____ ______the 1ittle cat looks!

4.Tom is taller than any other boy in his class.(保持句意基本不变)

Tom is ____ ____ boy in his class.

5.There are some visitors in our school today. (改为否定句)

There____ ____ visitors in our school today.

6. I need some chicken wings and a hamburger.(改为否定句)

I ________ _______any chicken wings and a hamburger.

7. Mr Smith has little work on Friday.(改为反义疑问句)

Mr Smith has little work on Friday________ _______?

8. They are going to pay 85 yuan for the tickets altogether.(划线提问)

_______ ________are they going to pay for the tickets altogether?

9. Sue prefers the blue shoes to the white shoes.(保持原句意思不变)

Sue_____he blue shoes better than he white_______.

10. We use a key ring to hold keys.(保持原句意思不变)

A key ring is used ______ ______keys.

11.to travel ,it,to the airport,convenient,by Maglev ,is ,in shanghai.(连词成句)

_____________________________________________________________.

12. He has been a doctor for twelve years. (就划线部分提问)

________ __________ has he been a doctor?

13. Kitty had bread and milk for break fast this morning. (改为反义疑问句)

Kitty had bread and milk for breakfast this morning,______ _______?

14. F red and his wife are very hardworking farmers.(改成感叹句)

______ _________ farmers Fred and his wife are!

15. The children are having a good time in the park. (保持句意基本不变)

The children are_______ _______in the park.

16. in the fields, vegetable, a farmer, grows(连词成句)

________________________________________________________________.

17. the sweater, Kitty, like does, round-neck(连词成句)

_______________________________________________________________?

18. Mike wrote some letters to his grandfather last month.(改为否定句)

Mike _______ _______ any letters to his grandfather last month.

19. They do some homework in the classroom before they leave school.(改为一般疑问句)________ they do _______ homework in the classroom before they leave school?

20. The Young Pioneers have done volunteer service for the old since 3 years ago.(对划线部分提问)

_______ _______ have the Young Pioneers done volunteer service for the old?

21. It’ll take you half an hour to go to Tokyo by air.(保持句意基本不变)

You will _______ half an hour _______ to Tokyo.

22. you, it is, working, success, impossible, to get, without, for, hard (.)

________________________________________________________________.

IX. Reading comprehension.(24分)

A. Choose the best answer.(5分)

As the second biggest city in the UK (just behind London), Birminghan is the fourth most visited city in the world by traveler. Located between two of England’s big places—London and Liverpool, Birmingham has often been overlooked. Recently, it has also been named one of the top cities in the world by a British travel book company.

According to the company, Birmingham was “the best place to travel in 2015.” The city is famous for its cultural variety, excellent shopping centers and beautiful scenery. As for its cultural variety, the youngest-ever Nobel Peace Prize winner in 2014, Malala Yousafzai(马拉拉), goes to school in Birmingham. She is a Pakistani activist(巴基斯坦活动家)who devotes herself to children’s education in her home country. The writer of The Lord of the Rings(《指环王》), J.R.R. Tolkein, also spent his children in this city. What’s more, the BBC TV drama Peaky Blinders(《浴血黑帮》)is set in Birmingham, too.

It is amazing to know that more than 30 places in the world take Birmingham as their cities’ name. Even a hole on the moon is call Birmingham. Moreover, no long ago, Chinese automaker Chang’an Automobiles(长安汽车)bought several buildings at the birmingham Business Park to do business in England’s second biggest city.

So, why don’t you write an itinerary(行程表)to have a look at some of “Birmingham”yourself? (Except for the hole on the moon, of course! But may be one day you can!)

1. Birmingham is ________.

①located between London and Liverpool

②the fourth most visited city in the world by travelers

③remembered by people all the time

④is famous for its cultural variety

A. ①②③

B. ②③④

C. ①②④

D. ①③④

2. What do Malala Yousafzai and J.R.R. Tolkein have in common?

A. They both devoted themselves to children’s education.

B. They both live in Birmingham.

C. Both of them have won a Nobel Peace Prize.

D. They have nothing in common.

3. Why was Birmingham named “the best place to travel in 2015”?

A. Because the city has a deep culture.

B. Because the city has excellent shopping centers.

C. Because the city has beautiful scenery.

D. All of the above.

4. Which of the following statements is not true?

A. Malala Yousafzai is a Pakistani activist.

B. Chinese automaker Chang’an Automobiles will do business in Birmingham in the future.

C. More than 30 places in the world take Birmingham as their cities’ name.

D. Birmingham is smaller than London and Liverpool.

5. What’s the best title of the article?

A. What you don’t know about Birmingham

B. The youngest-ever Nobel Peace Prize winner

C. Birmingham—a hole on the moon

D. A trip to Birmingham

B. Choose the words or expressions and complete the passage.(7分)

Batteries: Now and Then

Batteries are all over the place—in our cars, MP3 player and cell phones.

People have been using batteries ___1____ 200 years. In 1748 Benjamin Franklin first used the word “battery”. It was not until over 50 years ___2____ that the first battery was invented in 1800. In 1859 the first rechargeable(可充电的)storage battery was invented. This type of battery is still used in cars today. Then in 1954 the first solar battery(太阳能充电)was invented.

Today 15 billion batteries ___3____ in North America every year. But what should we do with the used batteries?

In fact, we should use ____4____ batteries. Use rechargeable batteries when possible. Remember ____5____ used batteries in the trash. Many batteries contain elements ____6____ can do great harm to the environment. Keep them away from fire or water.

We should also help collect used batteries ___7____ them in a special box and taking them to nearby recycling centers.

1.A. in B. since C. for D. during

2.A. late B. later C. latest D. lately

3. A. sell B. sells C. is sold D. are sold

4. A. more and more B. less and less C. the most D. fewer and fewer

5. A. to throw B. not to throw C. throwing D. not throwing

6. A. what B. which C. where D. whatever

7. A. for putting B. with put C. to put D. by putting

B

Hello,everyone!The new term has already started.Have you prepared well for it?We say well begun is____1____done. So we hope all of you can have a good beginning this term. Now we’d like to share our ways of learning English.

Some people seem to think language is for practicing grammar rules and learning lists of words-the longer the lists,the better.We couldn’t agree with them because we think language is for the exchange of ___2___and for communication.

The way to learn a language is to practice it as often as possible. A great man once said it is necessary to practice as much as possible ,and the more you use it in real environment ,the more nature it will become. Keep English in your mind by listening,speaking,or reading every day! This will make it much easier to learn it well.You will have a ____3___time remembering it only once a week.

Use a dictionary and grammar guide often.___4____a small English dictionary with you all the time .When you see a new word ,look it up.Think about the word -use it in your mind and in a sentence.

Don’t be___5___to ask for help .The more times you ask for help,the better English will become.Learn as much as you can from as many different people as you can!

Learning any language___6___a lot of effort.Relax and enjoy yourself .Rome wasn’t built in a day and your hard work will be rewarded one day.

1.A.good B.half C.fine D.well

2.A.ideas B.advice C.knowledge D.news.

3.A.hard B.happy C.sad D.fun

4.A.Buy B.Keep C.Find D.Have

5.A.sad B.tired C.kind D.afraid

6.A.takes https://www.360docs.net/doc/7f13046164.html,es C.puts D.tries

C. Read the passage and fill in the blanks with proper words.(7分)

Experiencing differences: watching with VR headset

The virtual reality(虚拟现实)headset has been announced as a new big thing in technology at present. It is a wearable(可穿戴的)device that allows you to physically see, hear, smell and t____1___ in a real or imagined world. In short, it p___2_____ you with an artificial environment. In that world, u___3____ can explore interactively(互动地)just as they can in the real world. For example, if you put on a VR headset, you can p____4____ speak with Sherlock Holmes and live on Baker Street as well.

However, i___5_____ activities are just one small use of VR technology. It will also be

used as a platform for e___79____ and medicine in the near future. Imagine studying in a classroom with students and teachers all over the world. Does that s____6___ really exciting?

B

If someone says to you: "give me five", do not search your pocket to get five yuan! It will m__1__others laugh! The person's not asking for your m___2___, but your fingers.

In the US, "give me five" or "give me the high five" is a popular gesture (动作). You can see it often in films or on TV. It means the slapping (拍) of each other's raised (举起的) right hands t___3___.

People do it when they meet for the first time or something h__4___ happens. For example, a student has good marks in exams or wins a lottery ticket (彩票). If a football team wins a game, the players will give high five to e___5____around to celebrate.

This gesture may come from the old Roman gesture of raising the right arm for the emperor (皇帝).

This s___6___that the person raising his arm did not have a sword (剑) in his hand. Why not try to give the high five to your friends?

D. Answer the questions.(5分)

Tips on talking to your doctor

Taking an active role in your health care can help you get the best care possible from your doctor. One way to do this is to improve your relationship with your doctor. The following are some tips to help you and your doctor improve your health care together.

Talk to your doctor. Be sure to tell your doctor about any current and past health care issue. It’s important to share any information you can, even if you’re embarrassed.

Ask questions. Don’t be afraid to speak up. It’s important for you to let your doctor know if you don’t understand something. If you don’t ask questions, your doctor will think you understand everything he or she has told you.

Take information home with you. Take written or recorded information home with you and that can help you remember information and instructions(指示)any time you need to.

Follow-up with your doctor. Make sure you follow any instructions your doctor gave you, like taking medicine, arranging a test or making an appointment with a specialist(专家). If you’re confused or if you’ve forgotten some information, it’s OK to contact your doctor.

1. To improve the relationship with the doctor is a good way to get the best care possible from the doctor, isn’t it?

2. How many tips should we follow according to the passage?

3. What should we tell our doctor?

4. Why should we take information home with us?

5. What should you do if you’ve forgotten some information?

X. Writing.(10分)

Write at least 60 words about the topic “My _______”

提示:在你们成长的历程中,渗透了父母的心血,充满了师长的关爱,得到了朋友的帮助,请以My _______为题,写一篇不少于60字的短文,描述你心中最重要的人或最令你难忘的人。

Use the following points as a reference(以下问题仅供参考)

Who is the person in your heart?

Why is the person so important in your heart?

What can you learn from the person?

北师大七年级数学培优题

七年级培优题 1、如图,在一个正方体的两个面上画了两条对角线AB ,AC ,那么这两条对角线的夹角等于 度。 2.。. 221x x x ++-+-的最小值是_______ 3、已知0132 =+-x x , 则 =++1 3242 x x x 。 4,一个长方体的长、宽、高分别为9cm, 6cm, 5cm ,先从这个长方体上尽可能大的切下一个正方体,再从剩余部分上又尽可能大的切下一个正方体,最后再从第二次剩余部分上又尽可能大的切下一个正方体,那么经过三次切割后剩余部分的体积为 cm 3. 5、如图,三角形ABC 的面积为1,BD ∶DC=2∶1,E 为AC 的中点,AD 与BE 相交于P ,那四边形PDCE 的面积为 。 6、如图,已知梯形ABCD ,AD ∥BC ,∠B+∠C=90°,EF=10,E ,F 分别是AD ,BC 的中点,则BC -AD =________ 7、如图,正方形ABCD 的边长为1,P 为AB 上的点, Q 为AD 上的点,且△APQ 的周长为2, 则∠PCQ=_______ 8、在长方形内画一些直线,已知边上 有三块面积分别为13,35,49,图中的数据表示所在的小块面积,则图中的阴影部分的 面积为 。 9、如图,设O 是等边三角形ABC 内一点, 已知∠AOB=115°,∠BOC=125°,则以 OA ,OB ,OC 为边所构成的三角形的各内 角的度数分别为 。 10、已知a 、b 、c 都不等于零,且c c b b a a m ||||||++= ,| |abc abc n =,那么n m +=_______ 11如果a 、b 、c 满足a +2b +3c =12,且a 2+b 2+c 2=ab +ac +bc ,则代数式a +b 2+c 3=_______ 12.如图,在长方形ABCD 中,已知AD=12、AB=5、BD=AC=13,P 是AD 上任意一点,PE ⊥BD 、PF ⊥AC ,那么PE+PF=_______ 【提示 长方形的对角线相等且互相平分】 13.在⊿ABC 中,AD ⊥BC ,垂足为D ,AB+BD=DC ,求证 ∠B=2∠C 14、已知正方形ABCD 中,E 为对角线BD 上一点,过E 点作EF ⊥BD 交BC 于F ,连接DF ,G 为DF 中点,连接EG ,CG . (1)直接写出线段EG 与CG 的数量关系; (2)将图1中△BEF 绕B 点逆时针旋转45o ,如图2所示,取DF 中点G ,连接EG ,CG . 你在(1)中得到的结论是否发生变化?写出你的猜想并加以证明. (3)将图1中△BEF 绕B 点旋转任意角度,如图3所示,再连接相应的线段,问(1)中的结论是否仍然成立? A D E G 图1 F A D C E G 图2 F A E 图3 D

杨浦补习班新王牌秋季班中考英语满分不是梦

I. 选择填空: ( )1.My father usually reads morning papers before going to ______ work. A. the B. a C. an D. / ( )2.The train to Beijing leaves ______ eight o’clock. Let’s hurry. A. in B. on C. at D. from ( )3.Please keep the park clean when you enjoy ______ there. A. your B. you C. yours D. yourselves ( )4.We haven’t got much ______ for our picnic. Will you go and get some? A. apple B. tomato C. bread D. biscuit ( )5.The farmers are satisfied ______ their harvest through a year’s hard work. A. with B. to C. of D. for ( )6.I’ve got two tickets for tonight’s concert. One is for me. ______ is for you. A. other B. the other C. others D. another ( )7.Jane can speak English ______. She wants to work for the Special Olympic Games. A. correct B. nice C. sweet D. well ( )8.This motorcycle is not as ______ as that one, and it uses less gas. A. expensive B. less expensive C. more expensive D. the most expensive ( )9.Which would you like to buy, a DVD player ______ an MP4 player? A. so B. or C. but D. and ( )10.Peter was late for the meeting ______ he missed the ferry. A. though B. because C. while D. if ( )11.Mr. Smith said to Billy, “Your ides sounds ______.”

广州最受欢迎补习班新王牌教育

第4课时 实数(1) 0.81 , 1.29= ,0.59 = 数概念做准备.

7 - { } { } 认识, 数概念的理解.

第5课时实数(2)

实数练习题 一、填空题 1.一个正数有 个平方根,0有 个平方根,负数 平方根. 2. 16 9 的算术平方根是 ,它的平方根是 . 3.一个数的平方等于49,则这个数是 . 4.16的算术平方根是 ,平方根是 . 5.一个负数的平方等于81,则这个负数是 . 6如果一个数的算术平方根是5,则这个数是 ,它的平方根是 723-的相反数地 ,绝对值是 . 8写出两个无理数,使它们的和为有理数 ;写出两个无理数,使它们的积为有理数 . 9在数轴上,到原点距离为5个单位的点表示的数是 . 10.在 262262226.4,9,4.0,81,8,2,3 1 ,14.3---?π.)个之间依次多两个216(中: 属于有理数的有 属于无理数的有 属于正实数的有 属于负实数的有 11.-5的相反数是 ,绝对值是 ,没有倒数的实数是 . 12., 2 π 1.5 二、选择题 13.下列说法正确的个数是 ( ) ①∵36.0)6.0(-2 = ∴-0.6是0.36的一个平方根 ②∵0.82 =0.64 ∴0.64的平方根是0.8 ③∵ 16 94 3 2 =)(- ∴43169=- ④∵2552=)(±∴525±±= A 1个 B 2个 C 3个 D 4个 14.下列说法中,正确的是 ( ) A.64的平方根是8 B.4的平方根是2或-2 C. 2 3)(-没有平方根 D.16的平方根是4和-4 15. 7的平方根是 ( )

小学生新学期黑板报内容资料

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解:| a | + | a+b | + | c-a | - | b-c |=-a-(a+b)+(c-a)+b-c=-3a 分析:解绝对值的问题时,往往需要脱去绝对值符号,化成一般的有理数计算。脱去绝对值的符号时,必须先确定绝对值符号内各个数的正负性,再根据绝对值的代数意义脱去绝对值符号。这道例题运用了数形结合的数学思想,由a 、b 、c 在数轴上的对应位置判断绝对值符号内数的符号,从而去掉绝对值符号,完成化简。 例2.已知:z x <<0,0>xy ,且x z y >>, 那么y x z y z x --+++ 的值( C ) A .是正数 B .是负数 C .是零 D .不能确定符号 解:由题意,x 、y 、z 在数轴上的位置如图所示: 所以 分析:数与代数这一领域中数形结合的重要载体是数轴。这道例题中三个看似复杂的不等关系借助数轴直观、轻松的找到了x 、y 、z 三个数的大小关系,为我们顺利化简铺平了道路。虽然例题中没有给出数轴,但我们应该有数形结合解决问题的意识。 例3.(分类讨论的思想)已知甲数的绝对值是乙数绝对值的3倍,且在数轴上表示这两数的点位于原点的两侧,两点之间的距离为8,求这两个数;若数轴上表示这两数的点位于原点同侧呢? 分析:从题目中寻找关键的解题信息,“数轴上表示这两数的点位于原点的两侧”意味着甲乙两数符号相反,即一正一负。那么究竟谁是正数谁是负数,我们应该用分类讨论的数学思想解决这一问题。 解:设甲数为x ,乙数为y 由题意得:y x 3=, (1)数轴上表示这两数的点位于原点两侧: 若x 在原点左侧,y 在原点右侧,即 x<0,y>0,则 4y=8 ,所以y=2 ,x= -6 若x 在原点右侧,y 在原点左侧,即 x>0,y<0,则 -4y=8 ,所以y=-2,x=6 (2)数轴上表示这两数的点位于原点同侧: 若x 、y 在原点左侧,即 x<0,y<0,则 -2y=8 ,所以y=-4,x=-12 若x 、y 在原点右侧,即 x>0,y>0,则 2y=8 ,所以y=4,x=12 例4.(整体的思想)方程x x -=-20082008 的解的个数是( D ) A .1个 B .2个 C .3个 D .无穷多个 分析:这道题我们用整体的思想解决。将x-2008看成一个整体,问题即转化为求方程a a -=的解,利用绝对值的代数意义我们不难得到,负数和零的绝对值等于它的相反数,所以零和任意负数都是方程的解,即本题的答案为D 。 例5.(非负性)已知|a b -2|与|a -1|互为相互数,试求下式的值. ()()()()()() 1111 112220072007ab a b a b a b ++++++++++L 0)()(=--+-+=--+++y x z y z x y x z y z x

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