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试题详情

鞍山市2009年高三毕业班第二次质量调查   学科网(Zxxk.Com)学科网

    本试卷分第一卷 (选择题)和第二卷(非选择题)。总分150分,考试时间为120学科网(Zxxk.Com)学科网

分钟。考生请将答案答在答题卡上,在本试卷上答题无效。考试结束后,将本试卷和答题卡一并交回。学科网(Zxxk.Com)学科网

第一部分:听力(共两节,每小题1.5, 满分30分)学科网(Zxxk.Com)学科网

第一节 (共5小题;每小题1.5分,满分7.5分)学科网(Zxxk.Com)学科网

 听下列5段对话,每段对话后有一个小题,从题中所给的A,B,C三个选项中选出最佳选项,并标在试卷的相应位置。听完每段对话后,你都有10秒钟的时间来回答有关小题和阅读下一个小题。每段对话仅读一遍。学科网(Zxxk.Com)学科网

1.           How much was the driver`s tip?学科网(Zxxk.Com)学科网

A.$3.5                   B.$0.5                   C.$1.5学科网(Zxxk.Com)学科网

2. What does the woman mean?学科网(Zxxk.Com)学科网

A. She definitely wants to know about the meeting.学科网(Zxxk.Com)学科网

B. She would like to let him know about the next meeting.学科网(Zxxk.Com)学科网

C. She will give him a call to ask about the next meeting.学科网(Zxxk.Com)学科网

3. Where does the conversation take place?学科网(Zxxk.Com)学科网

       A.At a hairdresser`s       B. At a tailor`s                     C.At a photographer`s学科网(Zxxk.Com)学科网

4. What does the woman mean?学科网(Zxxk.Com)学科网

       A.Jack has been on the paper for several days.学科网(Zxxk.Com)学科网

       B.Jack is working hard on the paper.学科网(Zxxk.Com)学科网

       C.He works only during the day.学科网(Zxxk.Com)学科网

5. What does the woman mean?学科网(Zxxk.Com)学科网

       A.The paper must be handed in on time.学科网(Zxxk.Com)学科网

       B.His request was made too late.学科网(Zxxk.Com)学科网

       C.The paper can be handed in a few days late.学科网(Zxxk.Com)学科网

第二节(共15小题每小题1.5分,满分22.5分)学科网(Zxxk.Com)学科网

听下面5段对话或独白。每段对话或独白后有几个小题,从题中所给的A、B、C三个选项中选出最佳选项,并标在试卷的相应位置。听每段对话或独白前,你将有时间阅读各个小题,每小题5秒钟;听完后,各小题将给出5秒钟的作答时间。每段对话或独白读两遍。学科网(Zxxk.Com)学科网

听下面一段对话,回答第6至8两个小题。现在,你有15秒钟的时间阅读这三个小题。学科网(Zxxk.Com)学科网

6.Why is the man going to the States?学科网(Zxxk.Com)学科网

       A.to visit places of interest学科网(Zxxk.Com)学科网

       B.to visit his friends学科网(Zxxk.Com)学科网

                                                                                           学科网(Zxxk.Com)学科网

C.to attend a conference学科网(Zxxk.Com)学科网

7.When will the man leave for American?学科网(Zxxk.Com)学科网

       A.in two weeks             B.in mid-January          C.on January 10th学科网(Zxxk.Com)学科网

8.What is the man?学科网(Zxxk.Com)学科网

       A.a scientist                  B.a writer                            C.a traveler学科网(Zxxk.Com)学科网

听下面一段对话,回答第9至10两个小题。现在,你有15秒钟的时间阅读这三个小题。学科网(Zxxk.Com)学科网

9.Which month is it most likely now?学科网(Zxxk.Com)学科网

       A.January                     B.March                       C.June学科网(Zxxk.Com)学科网

10.Which season was the best season last year?学科网(Zxxk.Com)学科网

       A.Spring                      B.Summer                    C.Autumn学科网(Zxxk.Com)学科网

听下面一段对话,回答第11至13两个小题。现在,你有15秒钟的时间阅读这三个小题。学科网(Zxxk.Com)学科网

11.What are the man and the woman doing?学科网(Zxxk.Com)学科网

       A.They are climbing the mountain.学科网(Zxxk.Com)学科网

       B.They are playing basketball.学科网(Zxxk.Com)学科网

       C.They are going down hill.学科网(Zxxk.Com)学科网

12.What happened to the man?学科网(Zxxk.Com)学科网

       A.He has sprained(扭伤) his left ankle(脚踝).学科网(Zxxk.Com)学科网

       B.He has sprained his right ankle.学科网(Zxxk.Com)学科网

       C.He has sprained his waist.学科网(Zxxk.Com)学科网

13.What is the woman`s message?学科网(Zxxk.Com)学科网

       A.be relaxed                 B.stop walking and relax                     C.sit down and rest学科网(Zxxk.Com)学科网

听下面一段对话,回答第14至17三小题。现在,你有15秒钟的时间阅读这三个小题。学科网(Zxxk.Com)学科网

14.Why does the woman refuse to exchange the shoes for the man?学科网(Zxxk.Com)学科网

       A.The man has kept the shoes for a week.学科网(Zxxk.Com)学科网

       B.The man had no receipt for the shoes.学科网(Zxxk.Com)学科网

       C.There is a sign reading no exchange after the shoes are sold.学科网(Zxxk.Com)学科网

15.What causes the woman to turn down refunding(退还) the man?学科网(Zxxk.Com)学科网

       A.her manager`s order          学科网(Zxxk.Com)学科网

B.her unknowing the price           学科网(Zxxk.Com)学科网

C.her unknowing whose fault it is学科网(Zxxk.Com)学科网

16.Why does the man think it isn`t his fault?学科网(Zxxk.Com)学科网

       A.because the shoes must be made badly学科网(Zxxk.Com)学科网

       B.because the shoes must have been used before he bought them.学科网(Zxxk.Com)学科网

       C.because he just wore the shoes for one time and then they were broken.学科网(Zxxk.Com)学科网

17.When did the man buy that pair of shoes?学科网(Zxxk.Com)学科网

       A.last week                   B.last weekend                     C.yesterday学科网(Zxxk.Com)学科网

听下面一段对话,回答第18至20三个小题。现在,你有15秒钟的时间阅读这三个小题。学科网(Zxxk.Com)学科网

18.What does the passage talk about?学科网(Zxxk.Com)学科网

       A.selling a house                  B.doing housework               C.losing a job学科网(Zxxk.Com)学科网

19.Why did the speaker sell her house?学科网(Zxxk.Com)学科网

       A.Her husand had got a higher position.学科网(Zxxk.Com)学科网

       B.Her husband had lost his job.学科网(Zxxk.Com)学科网

       C.She wanted to have a cleaner house.学科网(Zxxk.Com)学科网

20.Why did the agent call on the speaker so early in the morning?学科网(Zxxk.Com)学科网

       A.His telephone went out of order.学科网(Zxxk.Com)学科网

       B.The buyers had to leave soon.学科网(Zxxk.Com)学科网

       C.He began to work at 8 a.m.学科网(Zxxk.Com)学科网

学科网(Zxxk.Com)学科网

第二部分:英语知识运用(共两节,满分45分)学科网(Zxxk.Com)学科网

第一节:单项填空(共15小题;每小题1分,满分15分)学科网(Zxxk.Com)学科网

21.Journalism is described as __________science of searching, recording, and reporting_________ important events.   学科网(Zxxk.Com)学科网

A. a;the                          B. a; /              C. /; /            D. /;the学科网(Zxxk.Com)学科网

22.The teacher thought his students needed more practice and learning skills _______ much homework.  学科网(Zxxk.Com)学科网

A. other than                     B. rather than                C. more than          D. in place of学科网(Zxxk.Com)学科网

23.We are given a three-day holiday for May Day, but Harry is given ________ for his excellent work as a reward. That is, he has a six days’ holiday.  学科网(Zxxk.Com)学科网

       A. another three day      B. other three days     C. three more days  D. three days学科网(Zxxk.Com)学科网

24. The prices of many kinds of the computers ______ quickly these days.  学科网(Zxxk.Com)学科网

A. are raising               B. rises                       C. raise                 D. are going up学科网(Zxxk.Com)学科网

25.The child, who was believed ___ by a tiger, was found in a forest. 学科网(Zxxk.Com)学科网

A. to be killed        B. having killed     C. to have been killed       D. to be killing学科网(Zxxk.Com)学科网

26.When I was having my holiday abroad, those children kept quarrelling and _______ my fun.   学科网(Zxxk.Com)学科网

A. destroyed          B. damaged             C. injured                        D. spoiled学科网(Zxxk.Com)学科网

27.________ I met him, he was working as a secretary in a big company.  学科网(Zxxk.Com)学科网

A.For the first time                    B. The first time学科网(Zxxk.Com)学科网

C. The first time when                           D. When the first time学科网(Zxxk.Com)学科网

28.If the person        agrees,we sometimes use small recorders to make sure that we get all our facts straight.  学科网(Zxxk.Com)学科网

 A.interviewed    B.being interviewed  C.interviewing   D.to be interviewed学科网(Zxxk.Com)学科网

29.―Sam, it's too late. Our daughter ________ be back.  学科网(Zxxk.Com)学科网

―Don't be anxious. I dare say she ________ have some extra work to do. 学科网(Zxxk.Com)学科网

A. can; must       B. will; might        C. should; must       D. must; may 学科网(Zxxk.Com)学科网

30. Mary’s gold ring _______ from her mother as a gift for her wedding. 学科网(Zxxk.Com)学科网

       A. came from        B. came into               C. came down               D. came over

31. ______ production up by 40% , the company is certain to earn a lot this year.  

    A  As            B  For            C  With             D  Though

32.― ______ was ________ they were going to San Francisco? 

―Next week.

A. What; it that     B. It; what           C. When; that        D. When; it that

33.―Well, where is my watch?  

―_______! We just have two minutes left.

 A. Take your time   B. Come on         C. Don't worry       D. Take it easy

34. The old farmer has two sons, _________has got a job in the town and refused to do farming.

     A.each of whom    B.both of who       C.all of them         D. each of them

35. _______ has been done to prevent the factories from polluting the river, it remains a serious problem.   

        A. Though that      B. What                    C. Though what           D. Despite what

 

第二节:完形填空(共20小题;每小题1.5分,满分30分)

A weak old man went to live with his son,daughter-in-law, and four-year-old grandson. The family ate together at the table. But, the elderly grandfather`s  36  hands and failing sight made   37   difficult. Peas rolled off his spoon and food  38  onto the floor. When he held a glass, with his shaky hands, milk  39  on the tablecloth. His son and daughter-in-law became angry about the  40  .So, they put a small  41  in the corner. There Grandfather ate  42  , while the rest of the family enjoyed dinner together.  43  Grandfather had broken a dish or two, his food was served in a  44  bowl. When the family  45  in Grandfather`s direction, sometimes the old man had tears in his eyes.  46  ,the only words the couple had for him were  47  warnings, when he  48  a fork or spilt food. The four-year-old grandson watched it all in  49  .

  One evening, before supper, the father noticed his son playing with wood pieces on the floor. He asked the child  50  , “What are you making?” Just as sweetly, the boy responded, “Oh, I am making little  51  for you and Mama to eat your food from when I grow up.” The four-year-old son smiled and went back to work.

  The words so  52  the parents that they were speechless. Then tears started to stream down their cheeks. That evening, the husband took Grandfather`s hand and  53  led him back to the family table, and for rest of his  54  , he ate every meal with the family. And, for some reason, neither husband nor wife seemed to  55  any longer when a fork was dropped, or milk spilt.

 

36. A. shaky                B.rough            C. tough           D. large   

37. A. talking                     B.sleeping          C.eating                D.walking 

38.   A.spread                B.rained                C.lay                     D.covered 

39.   A.fell                    B.poured               C.flowed               D.spilt    

40.   A.trouble               B.mess                  C.scene                 D.action   

41.   A.chair                  B.bench                 C.bed                    D.table    

42.   A.alone                 B.slowly                C.carefully            D.little    

43.   A.Though              B.Because              C.While                D.Once  

44.   A.glass                  B.iron                   C.golden               D.wooden 

45.   A.glanced              B.turned                C.moved               D.pointed  

46.   A.Then                  B.Therefore           C.Besides              D.However     

47.   A.valuable             B.sharp                 C.useless               D.high     

48.   A.broke                 B.brought              C.dropped             D.touched  

49.   A.silence               B.joy                    C.amusement         D.disappointing 

50.   A.curiously            B.quietly               C.angrily               D.sweetly    

51.   A.boxes                 B.bowls                 C.tools                  D.toys   

52.   A.puzzled              B.moved               C.struck                D.frightened  

53.   A.gently                B.quickly                     C.actually              D.happily  

54.   A.meal                  B.days                   C.stay                   D.belongings  

55.   A.worry                B.notice                C.shout                 D.care  

 

第三部分:阅读理解(共20小题;每小题2分,满分40分)

第一节 (共15小题;每小题2分,满分30分)

A

  A man accused of failing to return more than 700 children’s books to five different libraries in the county was released(释放) from prison after a book publisher agreed to post his bond(保释金)of $1,000.The publisher said.“There’s a story here.This is a man who loves books.He just can’t let go of them.He hasn’t stolen a single book.So what’s the crime ? We think that Mr Banish has story to tell.We plan to publish his story.”  

When asked why he didn’t return the books. Mr Banish said,”Well,how could I ? They became family to me.I was afraid to return them,because I knew that kids or dogs would get hold of these books and chew them up,throw them around,tear the pages,spill soda on them,get jelly and jelly on them,and drown them in the toilet.

  He continued,“Books are people,too! They talk to you,they take care of you,and they enrich you with wisdom,humor and love.A book is a guest in my home.How could I kick it out? I repaired torn pages.I dusted them with a soft clean cloth.I turned their pages so they could breathe and get some fresh air.”

  “Every week I recognized them on their shelves so they could meet new friends,My books were HAPPY books.You could tell just by looking at them.Now they’re all back in the libraries,on the lower shelves,on the floors,at the mercy of all those runny-nosed kids I can hear them calling me.I need to rescue them.Excuse me.I have to go now.”

56.Why was the man put into prison? 

  A.Because the book publisher persuaded the police to do so.

  B.Because he stole 700 children’s books from the five different libraries.

  C.Because he refused to return the books that he had borrowed.

  D.Because he wanted to publish his story.

57.How did the man treat books?  

  A.He treated them as his family.

  B.He treated them as his own children.

  C.He treated them as his furniture.

  D.He treated them as his job .

58.What might happen after the man was set free? 

  A.He might stop borrowing books.

  B.He might start a library of his own.

  C.He might go on borrowing books from libraries.

  D.He might return all his books.

59.What is mainly talked about in this passage?  

  A.A funny thief who loves stealing books.

  B.A person who refuses to return borrowed books and wants to look after them.

  C.A person who is crazy about books so he keeps stealing them from the library.

  D.A person who may have some mental problems.

B

Special trees that grow faster, fight pollution, produce better wood, and even sense chemical attacks are being planted by scientists in the US.

    When 40 percent of Hawaii's US$14 million-a-year papaya (木瓜)industry was destroyed by a virus five years ago, work began on creating genetically engineered (转基因的) trees.

    Researchers successfully introduced seeds that were designed to resist the virus. Since then, more and more people have been testing genetically engineered trees.

    Some researchers put special bacteria into trees to help them grow faster and produce better wood. Others are trying to create trees that can clean polluted soil.

    Meanwhile fruit farmers are looking for trees that are strong enough to resist worms, and paper companies want trees that produce more wood and therefore more paper.

     The Pentagon (五角大楼) even gave the researchers US$500,000 this year after they developed a pine tree that changes its colours if it senses a chemical attack.

     So far, the poplar, eucalyptus (杨树与桉树), apple and coffee trees are among those being engineered. All this can be done today because we have a better understanding of tree genomes (基因组).

     However, some people fear that the genetically engineered trees will cause dangerous results. They are worried that the new trees will breed (繁殖)with natural species and change the balance of the forest environment.

     "It could be destructive," said Jim Diamond, an environmentalist. '"Trees are what is left of our natural environment and home to many endangered species."

    But researchers insist that science could give nature a fighting chance against both natural and man-made dangers.

    They hope to answer the critics (批评家)by stopping the new trees from breeding, so their effect on the environment can be controlled.

60. Which kind of tree is not the ones that scientists are planting in the US?                               

A. Trees that worms can't hurt.

B. Trees that can sense a chemical attack.

C. Trees that can resist wind better.

D. Genetically engineered trees.

61. What caused the American scientists to work on special trees directly? 

A. They think science could give nature a fighting chance against both natural and man-made dangers.

B. Great numbers of trees have been lost due to attacks by viruses.

C. Researchers successfully introduced seeds designed to resist the virus.

D. Tree genomes are mapped out so scientists know how to improve trees.

62. Which of the following was probably the first kind of trees being engineered? 

A. Papaya.           B. Pine.          C. Apple.             D. Poplar.

63. Why did critics think engineered trees dangerous? Because _________.

A. these trees can destroy the balance of nature

B. everything except trees has been genetically engineered

C. trees are home to many endangered species

D. these trees may affect normal trees

C

People who spend more pre-bedtime(睡前)hours using the Internet or watching television are more likely to report that they don`t get enough sleep, even though they sleep almost as long as people who spend fewer pre-bedtime hours in front of a computer or televison screen, survey findings show.

“The longer media use before sleep can trigger self-perceived(自我感觉的)insufficient(不足的)sleep,” lead researcher Dr Nakamori Suganuma of Osaka University said.

He and colleagues obtained data on self-perceived sleep problems and the use of electronic media before bedtime from a total of 5875 Japanese respondents in two separate Internet-based surveys.

Nearly half of the respondents linked their lack of sleep with electronic media use before bedtime. Those reporting longer electronic media use were also more likely to report insufficient sleep.

Overall,29 percent of light users (less than 1.5 hours)listed electronic media use as a possible cause of their insufficient sleep. By comparison, 40 percent of medium (中级的)users(1.5 to 3 hours) and 54 percent of heavy users (more than 3 hours) said the same.

However, longer Internet and television use before bedtime was not linked with less actual sleep. While heavy users averaged about 3 more hours in front of computer or television screens than light users, the heavy users averaged only about 12 minutes less pre-workday sleep than light users.Suganuma said, “Internet use affected self-perceived insufficient sleep more than TV watching in both younger Internet users and middle-aged or aged users.”

Up to 38 percent of the respondents listed accessing the Internet far into the night as a possible cause for their sleep disturbance ,while about 25 percent said watching television far into the night caused their sleep problems.The findings suggest that while heavy computer and television use before bedtime has a small effect on sleep duration, it may have a more significant effect on “sleep demand and sleep quality.” Suganuma notes.

64. The underlined word “trigger” in Paragraph 2 means “________”.   

       A.remove                            B.cause                 C.increase                     D.decrease

65. From the passage, we learn________.  

A.     what kind of people have less actual sleep

B.      self-perceived insufficient sleep is linked to electronic media use

C.      Why the use of electronic media before bedtime affects sleep

D.     Using electronic media before bedtime makes people sleepless

66. Which of the following is NOT a result of the survey?  

A.     People who use electronic media longer before bedtime are more likely to report 

insufficient sleep.

B.      About 38 percent of the respondents think accessing the Internet far into the night is a cause for sleep disturbances.

C.      Internet use affects self-perceived insufficient sleep more than watching TV.

D.     Most self-perceived insufficient sleep is connected with electronic media use before bedtime.

D

Experts say the American state of Hawaii has been affected by a small frog called the coqui(科基蛙) .There may be millions of the small frogs in Hawaii.However, they do not belong there. They are normally found in the Caribbean island of Puerto Rico and in the southeastern United States.These coqui frogs are harming Hawaii`s environment, and the extremely loud noise they make is causing problems for Hawaiian citizens and visitors. The coquis arrived in Hawaii about ten years ago. They are believed to have been brought in accidentally in shipments of plants from Puerto Rico or Florida. Their numbers have sharply increased. They have quickly spread around the Hawaiian Islands and all hidden in plants.

  The coqui is a brown frog about five centimeters long. During the day, the frogs hide in wet protected areas, such as under plant leaves. At night , the frogs move onto trees to feed, call to females and mate(交配).

  In their native Puerto Rico, local people celebrate coqui frogs. But in Hawaii, the foreign frog is thought as a harmful animal.The coqui frogs are a major threat to Hawaii`s environmental system. The frogs eat thousands of insects every night .These insects are important to plants ,and are also important food for Hawaii`s native.

  The frogs are also affecting the tourism industry in Hawaii. Increasing numbers of hotels, visitors and local people are disturbed by the loud calls made by male coqui frogs to female frogs.At night ,the noise often makes it difficult for people to sleep. The mating call of the male coqui sounds like: “ Ko-Kee! Ko-Kee!” That is how they got their name.

  The frogs do not have any natural enemies in Hawaii to reduce their population size. The warm weather permits them to lay eggs all year long.

  Many efforts have been made in Hawaii to stop the spread of the coqui. The Hawaiian Department of Agriculture is trying to find an effective chemical that can be safely used to kill the frogs. Until then, the only way to catch the frogs is by hand.

67.Coqui frogs get their name from________.  

A.     the sound of their loud calls

B.      their shape and colour

C.      their coming from other parts of the USA

D.     people who dislike them

68.Which of the following is NOT a reason why people in Hawaii dislike coquis?  

A.     They are harming Hawaii`s environment.

B.      They have a bad effect on tourism.

C.      They eat insects which are important for plants.

D.     They hide in wet places and make loud sounds during the day.

69.Which of the following contributes to the increasing number of coquis in Hawaii?  

A.     There aren`t any animals in the world which eat coquis.

B.      They are easy to catch.

C.      They are easy to breed (繁殖)there.

D.     They eat a lot of insects in one night.

70.What would be the best title for the passage?  

A.     Coquis―Good or Harmful Animals?

B.      Coquis―A Big Threat to Hawaii

C.      Coquis Make Sleep Difficult

D.     Coquis―the Number Sharply Increased

第二节(共5小题;每小题2分,满分10分)

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。备选答案中有两项为多余选项。

Why do some people have many friends while others do not?  71 However, it is not so. Let’s look at two psychological experiments which will give you the key to happy interpersonal relations.

1,3,5

73   After Martin Luther King, Jr was killed in the 1960s, a teacher, Jane Elliott, living in an all ? white town decided to help her class of young children understand why the Civil Rights Movement had been necessary in America.

She divided the class into two groups: one with blue eyes and the other with brown eyes. Other eye colours such as hazel or green were excluded from his exercise. Then she told the class that brown ? eyed people were cleverer than blue ? eyed ones because of an agent (化学作用) for brown colour found in their blood. Blue ? eyed people were stupid, lazy and not to be trusted. Jane Elliott did not need to say any more. The brown ? eyed students quickly got used to their new role as the leaders of the class. The blue ? eyed students became quiet and withdrawn. Then she discovered something very interesting. Four poor brown ? eyed readers began to read fluently in a way they had never done before.   74  .So if you want to be successful and happy, take an interest in others whether they are your classmates or workmates. Congratulate them on their successes and sympathise(同情) with them in their troubles.   75  .

A. Before the experiment the management talked to both groups of workers and explained that they wanted to find the best working environment for them.

B. Remember that the way you treat others will decide their attitude and behaviour to you.

C. The second experiment shows what happens to personal relations if you are rude to or ignore(忽略) others.

D. The ones who have more friends usually are those who care about others.

E. Jane Elliott had shown that the way people are treated affects not only their behaviour but also their confidence and their performance.

F.You may even imagine that this ability was something they were born with because it seems so effortless to them.

G. The second experiment tells us what teachers said has a great effect on the students.

第四部分:写(共两节,满分35分)

第一节:短文改错(共10小题;每小题1分,满分10分)

文中共有10处语言错误,每句中最多两处。错误涉及一个单词的增加、删除或修改。

增加:在此处加一个漏字符号(∧),并在其下面写出修改的词。

删除:把多余的词用斜线(\)划掉。

修改:在错的词下划一横线,并在其下面写出修改后的词。

注意:1.每处错误及其修改均仅限一词;

2.只允许修改10处,多者(从十一处起)不计分。

This is a story told by my father : When I was boy , the most exciting

thing was when to celebrate the Spring Festival . My grandma was the

best cooker in the world but could make the most delicious dishes . Once ,

I just couldn’t wait for the Spring Festival dinner . As I was about take a

piece from a cooked duck , I saw Grandma in the kitchen looking me .

Shake her head , she said , “It isn’t a good time to do that , dear .” I apologize

and controlled me at the best till the dinner started . You know , that was

a dinner we had waited for several month .       

 

第二节:书面表达(满分25分)

肥胖(fatness)已经成为危害人们健康的严重问题,中小学生的肥胖趋势更为明显。你们班对此展开讨论。根据不同的观点,写一篇100词左右的短文。

    1.肥胖危害健康,应该节食,锻炼,预防肥胖。已经超重的,应该采取措施减肥。

2.中学生正是长身体的时候,减肥不仅会影响身体发育,而且也会影响学习,因此应该顺其自然。

 

 

 

鞍山市2009年第二次高三质量调查考试

英语试题答案

 

1― 5  BAABA   6―10 CBACC   11―15 CBACC  16―20 CAABB

21―25 BBCDC   26―30 DBBCC  31―35 CDBAD  36―40 ACBDB

41―45 DABDA   46―50 DBCAD  51―55 BCABD  56―60 CACBC

61―65 BADBB   66―70 DADCB  71―75 FACEB

短文改错:

This is a story told by my father : When I was∧ boy , the most exciting

                                       a

学科网(Zxxk.Com)thing was when to celebrate the Spring  Festival . My grandma was the

 

best cooker in the world but could make the most delicious dishes . Once ,

    cook            and

I just couldn’t wait for the Spring Festival dinner . As I was about ∧take a

                                                      to

piece from a cooked duck , I saw Grandma in the kitchen looking ∧ me .

                                                     at

Shake her head , she said , “It isn’t a good time to do that , dear .”I apologize

Shaking                                               apologized

and controlled me at the best till the dinner started . You know , that was

            myself

a dinner we had waited for several month .        

                            months

 

作文:

Fatness is one of the serious problems which have a bad effect on our health. And at present the situation in the teenagers is even worse. As to this, a discussion was carried out in our class.

Some students think fatness does harm to our health, so it is necessary to be on a diet and take suitable exercise to prevent it. Those who are overweight should take measures to lose weight to be healthy.

But others have a different opinion. They say losing weight will be bad for the teenagers during their growth course, as well as their studies. So there is no doubt to leave it as it is.  

 

 

 

 

 

试题详情

第9讲 不等式(组)与方程(组)的应用

 

【例题经典】

例1 (2006年内江市)内江市对城区沿江两岸的部分路段进行亮化工程建设,整个工程拟由甲、乙两个安装公司共同完成.从两个公司的业务资料看到:若两个公司合做,则恰好用12天完成;若甲、乙合做9天后,由甲再单独做5天也恰好完成.如果每天需要支付甲、乙两公司的工程费用分别为1.2万元和0.7万元.

 (1)甲、乙两公司单独完成这项工程各需多少天?

 (2)要使整个工程费用不超过22.5万元,则乙公司最少应施工多少天?

 【点评】(1)利用方程组解决;(2)利用不等式解决,结合实际取值.

 

 

 

 

 

 

 

 

 

 

 

 

例2  (2005年潍坊市)为了加强学生的交通安全意识,某中学和交警大队联合举行了“我当一日小交警”活动,星期天选派部分学生到交通路口值勤,协助交通警察维持交通秩序.若每一个路口安排4人,那么还剩下78人;若每个路口安排8人,那么最后一个路口不足8人,但不少于4人.求这个中学共选派值勤学生多少人?共在多少个交通路口安排值勤?

    【分析】本题与学生生活实际联系紧密,是一道很好的列不等式组应用题,解决本题应注意路口人数与总人数之间的关系.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

例3  华溪学校科技夏令营的学生在3名老师的带领下,准备赴北京大学参观,体验大学生活.现有两个旅行社前来承包,报价均为每人2000元,他们都表示优惠;希望社表示带队老师免费,学生按8折收费;青春社表示师生一律按7折收费.经核算,参加两家旅行社费用正好相等.

    (1)该校参加科技夏令营的学生共有多少人?

    (2)如果又增加了部分学生,学校应选择哪家旅行社?

 【点评】方程与不等式的综合应用,注意取值与实际生活要相符

 

 

 

 

 

 

 

 

 

 

 

【基础训练】

1.(2006年深圳市)九年级的几位同学拍了一张合影作留念,已知冲一张底片需要0.80元,洗一张相片需要0.35元.在每位同学得到一张相片、共用一张底片的前提下,平均每人分摊的钱不足0.5元,那么参加合影的同学人数(  )

    A.至多6人     B.至少6人    C.至多5人     D.至少5人

2.现用甲、乙两种运输车将46吨抗旱物资运往灾区,甲种运输车载重5吨,乙种运输车载重4吨,安排车辆不超过10辆,则甲种运输车至少应安排(  )

    A.4辆     B.5辆     C.6辆     D.7辆

3.(2005年内江市)在一次“人与自然”知识竞赛中,竞赛题共25道,每道题都给4个答案,其中只有一个答案正确,选对得4分,不选或选错倒扣2分,得分不低于60分得奖,那么得奖至少应选对题(  )

    A.18道     B.19道     C.20道     D.21道

4.一种灭虫药粉30千克,含药率15%,现要用含药率较高的同种灭虫药粉50千克和它混合,使混合后的含药率大于20%而小于35%,则所用药粉的含药率x的范围是( )

    A.15%<x<23%    B.15%<x<35%     C.23%<x<47%    D.23%<x<50%

5.(2005年吉林省)某林场原计划在一定期限内固沙造林240公顷,实际每天固沙造林的面积比原计划多4公顷,结果提前5天完成任务,设原计划每天固沙造林x公顷,根据题意下列方程正确的是(  )

   

6.(2006年内江市)某学校要印刷一批完全材料,甲印务公司提出制版费900元,另外每份材料收印刷费0.5元;乙印务公司提出不收制版费,每份材料收印刷费0.8元.

    (1)分别写出两家印务公司的收费y(元)与印刷材料的份数x(份)之间的函数关系式.

    (2)若学校预计要印刷5000份以内的宣传材料,请问学校应选择哪一家印务公司更合算?

 

 

 

 

 

 

 

 

7.水是人类最宝贵的资源之一,我国水资源人均占有量远远低于世界平均水平,为了节约用水,保护环境,学校于本学期初制定了详细的用水计划.如果实际每天比计划多用一吨水,那么本学期的用水总量将会超过2300吨;如果实际每天计划节约一吨水,那么本学期用水量将会不足2100吨.如果本学期的在校时间按110天(22周)计算,那么学校计划每天用水量是在什么范围?(结果保留四个有效数字)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 8.某商场购进甲、乙两种服装后,都加价40%标价出售.“春节”期间商场搞优惠促销,决定将甲、乙两种服装分别按标价的八折和九折出售.某顾客购买甲、乙两种服装共付款182元,两种服装标价之和为210元,问这两种服装的进价和标价各是多少元?

 

 

 

 

 

 

 

 

 

 

 

 

 

【能力提升】

9.(2006年江阴市)某公司开发的960件新产品,需加工后才能投放市场,现有甲、乙两个工厂都想加工这批产品,已知甲工厂单独加工完成这批产品比乙工厂单独加工完成这批产品多用20天,而乙工厂每天比甲工厂多加工8件产品.在加工过程中,公司需每天支付50元劳务费请工程师到厂进行技术指导.

    (1)甲、乙两个工厂每天各能加工多少件新产品?

    (2)该公司要选择省时又省钱的工厂加工,乙工厂预计甲工厂将向公司报加工费用为每天800元,请问:乙工厂向公司报加工费用每天最多为多少元时,才可满足公司要求,有望加工这批产品.

 

 

 

 

 

 

 

 

 

 

 

10.(2006年扬州市)“中国荷藕之乡”扬州市宝应县有着丰富的荷藕资源.某荷藕加工企业已收购荷藕60吨,根据市场信息,如果对荷藕进行粗加工,每天可加工8吨,每吨可获利1000元;如果进行精加工,每天可加工0.5吨,每吨可获利5000元.由于受设备条件的限制,两种加工方式不能同时进行.

    (1)设精加工的吨数为x吨,则粗加工的吨数为______吨,加工这批荷藕需要____天,可获利______元(用含x的代数式表示)

    (2)为了保鲜需要,该企业必须在一个月(30天)内将这批荷藕全部加工完毕,精加工的吨数x在什么范围内时,该企业加工这批荷藕的获利不低于80000元?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

11.(2005年河南省)某公司为了扩大经营,决定购进6台机器用于生产某种活塞.现有甲、乙两种机器供选择,其中每种机器的价格和每台机器日生产活塞的数量如下表所示.经过预算,本次购买机器所耗资金不能超过34万元.

 

价格(万元/台)

 7

5

每台日产量(个)

100

60

    (1)按该公司要求可以有几种购买方案?

    (2)若该公司购进的6台机器的日生产能力不能低于380个,那么为了节约资金应选择哪种购买方案?

 

 

 

 

 

 

 

 

 

 

 

 

 

12.(2005年贵州省)为迎接“2005.中国贵州黄果树瀑布节”,园林部门决定利用现有的3600盆甲种花卉和2900盆乙种花奔搭配A、B两种园艺造型共50个,摆放在迎宾大道两侧,搭配每个造型所需要花奔情况如下表所示:

造型

 A

90盆

30盆

 B

40盆

100盆

    (1)符合题意的搭配方案有哪几种?

    (2)若搭配一个A种造型的成本为1000元,搭配一个B种造型的成本为1200元,试说明选用(1)中哪种方案成本最低?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

【应用与探究】

13.(2006年长沙市)我市某乡A、B两村盛产柑桔,A村有柑桔200吨,B村有柑桔300吨.现将这些柑桔运到C、D两个冷藏室,已知C仓库可储存240吨,D仓库可储存260吨;从A村运往C、D两处的费用分别为每吨20元和25元,从B村运往C、D两处的费用分别为每吨15元和18元.设从A村运往C仓库的柑桔重量为x吨,A、B两村运往两仓库的柑桔运输费用分别为yA元和yB元.

    (1)请填写下表,并求出yA、yB与x之间的函数关系式:

 

  C

  D

 总计

 A

x吨

 

200吨

 B

 

 

300吨

总计

240吨

260吨

500吨

    (2)试讨论A、B两村中,哪个村的运费较少;

    (3)考虑到B村的经济承受能力,B村的柑桔运费不得超过4830元.在这种情况下,请问怎样调运,才能使两村运费之和最小?求出这个最小值.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

答案:

例题经典 

例1:(1)甲独做20天,乙独做30天 

(2)设甲做了x天,乙做了y天完成作业,

解y≥15,即乙公司最少应施工15天.

例2:学校派出158名,共有20个交通路口安排值勤

例3:(1)学生共有21人  (2)应选青春社

考点精练 

1.B  2.C  3.B  4.C  5.B 

6.(1) 

(2)y<y­,∴900+0.5x<0.8x,解得x>3000,

∴选甲公司 

7.应控制在:19.91到20.09吨之间 

8.甲进价为50元,标价70元,乙进价为100元,标价140元 

9.解:(1)设甲工厂每天加工x件,则乙公司每天加工(x+8)件 

由题意得:,解之得:x1=-24,x2=16.

经检验,x1、x2均为所列方程的根,但x1=-24不合题意,舍去.

此时x+8=24.

答:甲工厂每天加工16件,乙工厂每天加工24件.

(2)由(1)可知加工960件产品,甲工厂要60天,乙工厂要40天.

所以甲工厂的加工总费用为60×(800+50)=51000(元).

设乙工厂报价为每天m元,则乙工厂的加工总费用为40×(m+50)元.

由题意得:40×(m+50)≤51000,解得m≤1225.

答:乙工厂所报加工费每天最多为1225元,可满足公司要求,有望加工这批产品. 

10.(1)(60-x)吨,()天,[5000x+(60-x)×1000]元 

(2)5(吨)≤x≤12(吨) 

11.(1)有3种方案:①甲0台,乙6台,②甲1台,乙5台,③甲2台,乙4台 

(2)应选方案② 

12.(1) 

A

30

31

32

B

20

19

18

(2)设费用为y=1000x+1200(50-x)=-200x+60000,∴A32天,B18个费用最低. 

13. (1)

 

  C

  D

 总计

 A

x吨

(200-x)吨

200吨

 B

(240-x)吨

(60+x)吨

300吨

总计

240吨

260吨

500吨

yA=-5x+5000(0≤x≤2000),yB=3x+4680(0≤x≤200).

 (2)当yA=yB时,-5x+5000=3x+4680,x=40;

当yA>yB时,-5x+5000>3x+4680,x<40;

当yA<yB时,-5x+5000<3x+4689,x>40,

∴当x=40时,yA=yB即两村运费相等;

当0≤x<40时,yA>yB即B村运费较少;

当40<x≤200时,yA<yB即A村费用较小.

(3)由yB≤4830,3x+4680≤4830,∴x≤50,

设两村运费之和为y,∴y=yA+yB,即:y=-2x+9680.

又∵0≤x≤50时,y随x增大而减小.

∴当x=50时,y有最小值,y最小值=9580(元).

答:当A村调往C仓库的柑桔重量为50吨,调往D仓库为150吨,B村调往C仓库为190吨,调往D仓库110吨的时候,两村的运费之和最小,最小费用为9580元.

 

试题详情

初三数学复习教学案

第8讲 一元一次不等式(组)及应用

 

【回顾与思考】

【例题经典】

 

不等式的性质及运用

例1 下列四个命题中,正确的有(  )

    ①若a>b,则a+1>b+1;②若a>b,则a-1>b-1;

    ③若a>b,则-2a<-2b;④若a>b,则2a<2b.

    A.1个    B.2个    C.3个    D.4个

  【分析】注意观察前后两个式子的变化,想一想与不等式的性质是否相符.

 

会解一次不等式,并理解解集用数轴表示的意义

例2 (2006年嘉兴市)解不等式x>x-2,并将其解集表示在数轴上.

  【点评】步骤类似于解一元一次方程,但要注意不等号方向的变化.

 

借助数轴,解一元一次不等式组

例3  (2006年淄博市)解不等式组,并在数轴上表示解集.

     

  【点评】先求每个不等式的解集,再借助数轴求不等式组的解集.

 

会列不等式(组)解应用题

例4 (2006年广东省)将一箱苹果分给若干个小朋友,若每位小朋友分5个苹果,则还剩12个苹果;若每位小朋友分8个苹果,则有一个小朋友分不到8个苹果.求这一箱苹果的个数与小朋友的人数.

 【点评】从题意寻求两个不等关系,列出不等式组,求出解集,并取正整数解.

 

【基础训练】

1.(2006年芜湖市)已知a>b>0,则下列不等式不一定成立的是(  )

    A.ab>b2     B.a+c>b+c    C.<     D.ac>bc

2.(2006年绍兴市)不等式2-x>1的解集是(  )

    A.x>1     B.x<1     C.x>-1     D.x<-1

3.如图,数轴上所表示的不等式组的解集是(  )

A.x>-1     B.-1<x≤2    C.-1≤x≤2    D.x≤2

4.(2006年深圳市)下列不等式组的解集,在数轴上表示为如图所示的是(  )

5.不等式组的解集在数轴上表示正确的是(  )

6.(2006年包头市)不等式组的解集是(  )

    A.0<x≤4     B.3<x<4     C.1<x≤4    D.2<x≤8

7.关于x的不等式组只有4个整数解,则a的取值范围是(  )

   A.-5≤a≤-     B.-5≤a≤-    C.-5<a≤-      D.-5<a<-

8.(2006年随州市)不等式组的整数解是_______.

9.(2006年包头市)一堆玩具分给若干个小朋友,若每人分3件,则剩余3件;若前面每人分5件,则最后一人得到的玩具不足3件.则小朋友的人数为______人.

10.一次普法知识竞赛共有30道题,规定答对一道题得4分,答错或不答一道题得-1分,在这次竞赛中,小明获得优秀(90分或90分以上),则小明至少答对了______道题.

 

 

 

【能力提升】

11.(2006年怀化市)求不等式+2y≤-+8所有正整数解的和.

 

 

 

12.解下列不等式组

(1)              (2)(2006年绵阳市)

 

 

 

 

 

 

 

 

 

 

 

 

13.解不等式组,并把其解集在数轴上表示出来.

 

 

 

 

 

 

 

 

 

14.(2006年沪州市)九年级(3)班学生到学校阅览室上课外阅读课,班长问老师要分成几个小组,老师风趣地说:假如我把43本书分给各小组,若每组8本,还有剩余;若每组分9本,却不够,你知道该分几个组吗?(请你帮助班长分组,注意写出解题过程,不能仅有分组的结果哟!)

 

 

 

 

15.

    根据对话的内容,试求出饼干和牛奶的标价各是多少元?

 

 

 

 

 

 

 

 

【应用与探究】

16.(2005年重庆市)由于电力紧张,某地决定对工厂实行错峰用电.规定:在每天的7:00到24:00为用电高峰期,电价为a元/kW?h;每天0:00到7:00为用电平稳期,电价为b元/kW?h;下表为某厂4月和5月两个月的用电量和电费的情况统计表:

月份

用电量(万kW?h)

电费(万元)

 4

        12

    6.4

 5

        16

    8.8

    (1)若4月份在平稳期的用电量占当月用电量的,5月份在平稳期的用电量占当月用电量的,求a,b的值.

    (2)若6月份该厂预计用电20万kW?h,为将电费探究在10万元至10.6万元之间(不含10万元和10.6万元),那么6月份在平稳期的用电量占当月用电量的比例应控制在什么范围?

 

 

 

 

 

 

 

 

 

答案:

例题经典

 例1:B 

例2:x>-3 

例3:x≥13  例4:设有x个小朋友,则苹果为(5x+12)个,

所以0<8x-(5x+12)<8,解之得4<x<

所以x取5或6,当x=5时,5x+12=37,当x=6时5x+12=42.

考点精练 

1.D  2.B  3.B  4.D  5.B  6.A  7.C 

8.有±1和0  9.3人  10.24道 

11.和为6  12.(1)-1≤x<3  (2)x≤- 

13.-2<x≤3  数略表示略 

14.设分x个组  则取整数x=5 

15.解:设饼干的标价每盒x元,牛奶的标价为每袋y元,

由②得y=9.2-0.9x.④.

把④代入①得,x+9.2-0.9x>10,

∴x>8.由③得8<x<10.

∵x是整数,∴x=9.

将x=9代入④,得y=9.2-0.9×9=1.1,

答:饼干一盒标价9元,一袋牛奶标价1.1元 

16.解:(1)根据题意得 

(2)设6月份在平稳期的用电量占当月用电量的x,

根据题意得10<20?(1-x)?0.6+20?x?0.4<10.6,解得0.35<x<0.5,

故6月份在平稳期的用电量应占当月用电量的0.35至0.5.

 

 

试题详情

初三数学复习教学案

第7讲 分式方程及应用

 

【回顾与思考】

 

【例题经典】

 

理解分式方程的有关概念

例1  指出下列方程中,分式方程有(  )

    ①=5  ②=5  ③x2-5x=0  ④+3=0

    A.1个     B.2个     C.3个     D.4个

  【点评】根据分式方程的概念,看方程中分母是否含有未知数.

 

掌握分式方程的解法步骤

例2  解方程:

(1)(2006年成都市)

 

    (2)(2006年绍兴市)

【点评】注意分式方程最后要验根。

 

 

分式方程的应用

例3  (2006年长春市)某服装厂装备加工300套演出服,在加工60套后,采用了新技术,使每天的工作效率是原来的2倍,结果共用9天完成任务,求该厂原来每天加工多少套演出服.

 【点评】要用到关系式:工作效率=

 

 

 

【基础训练】

1.如果分式的值相等,则x的值是(  )

A.9      B.7       C.5     D.3

 

2.(2005年宿迁市)若关于x的方程=0有增根,则m的值是(  )

A.3      B.2       C.1        D.-1

 

3.(2006年嘉兴市)有两块面积相同的小麦试验田,分别收获小麦9000kg和15000kg.已知第一块试验田每公顷的产量比第二块少3000kg,若设第一块试验田每公顷的产量为xkg,根据题意,可得方程(  )

 

4.已知方程有增根,则这个增根一定是(  )

A.2       B.3         C.4        D.5

 

5.方程的解是(  )

A.1       B.-1       C.±1       D.0

 

6.张老师和李老师同时从学校出发,步行15千米去县城购买书籍,张老师比李老师每小时多走1千米,结果比李老师早到半小时,两位老师每小时各走多少千米?设李老师每小时走x千米,依题,得到的方程是(  )

 

7.(2006年怀化市)方程的解是_______.

 

8.若关于x的方程-1=0无实根,则a的值为_______.

 

9.若x+=2,则x+=_______.

 

【能力提升】

10.解下列方程:

  (1)=1;          (2)(2006年河南省)=3。

 

 

 

 

 

 

 

11.(2006年长沙市)在社会主义新农村建设中,某乡镇决定对一段公路进行改造.已知这项工程由甲工程队单独做需要40天完成;如果由乙工程队先单独做10天,那么剩下的工程还需要两队合做20天才能完成.

  (1)求乙工程队单独完成这项工程所需的天数;

  (2)求两队合做完成这项工程所需的天数.

 

 

 

 

 

 

 

12.(2006年怀化市)怀化市某乡积极响应党中央提出的“建设社会主义新农村”的号召,在本乡建起了农民文化活动室,现要将其装修.若甲、乙两个装修公司合做需8天完成,需工钱8000元;若甲公司单独做6天后,剩下的由乙公司来做,还需12天完成,共需工钱7500元.若只选一个公司单独完成.从节约开始角度考虑,该乡是选甲公司还是选乙公司?请你说明理由.

 

 

 

 

 

 

 

 

13.请根据所给方程=1,联系生活实际,编写一道应用题(要求题目完整题意清楚,不要求解方程)

 

 

 

 

 

 

14.先阅读下列一段文字,然后解答问题.

    已知:

    方程x-=1的解是x1=2,x2=-

    方程x-=2的解是x1=3,x2=-

    方程x-=3的解是x1=4,x2=-

    方程x-=4的解是x1=5,x2=-

    问题:观察上述方程及其解,再猜想出方程x-=10的解,并写出检验.

 

 

 

 

 

 

【应用与探究】

15.阅读理解题:

    阅读下列材料,关于x的方程:

    x+=c+的解是x1=c,x2=

    x-=c-的妥是x1=c,x2=-

    x+=c+的解是x1=c,x2=

    x+=c+的解是x1=c,x2=……

    (1)请观察上述方程与解的特征,比较关于x的方程x+(m≠0)与它们的关系,猜想它的解是什么,并利用“方程的解”的概念进行验证.

    (2)由上述的观察、比较、猜想、验证,可以得出结论:如果方程的左边是未知数与其倒数的倍数,方程右边的形式与左边完全相同,只把其中未知数换成了某个常数,那么这样的方程可以直接得解,请用这个结论解关于x的方程:x+.

 

 

 

 

 

 

答案:

例题经典 

例1:B 

例2:(1)x=-  (2)x=4 

例3:设服装厂原来每天加工x套,则=9,解之得x=20,

经检验x=20是原方程的根,答:略

考点精练 

1.A  2.B  3.C  4.B  5.D  6.B 

7.x=0  8.a=1  9.x2+=2 

10.(1)x=2  (2)x=- 

11.(1)解:设乙工程队单独完成这项工程需要x天,

根据题意得:×20=1,

解之得:x=60,经检验:x=60是原方程的解.

答:乙工程队单独完成这项工程所需的天数为60天.

(2)解:设两队合做完成这项工程需的天数为y天,

根据题意得:()y=1,解得:y=24.

答:两队合做完成这项工程所需的天数为24天 

12.解:设甲独做x天完成,乙独做y天完成

设甲每天工资a元,乙每天工资b元.

∴甲独做12×750=9000,乙独做24×250=6000,

∴节约开支应选乙公司. 

13.略 

14.x1=11,x2=-  检验略 

15.(1)x1=c,x2=.

 

 

试题详情

初三数学复习教学案

第6讲 一元二次方程及应用

【回顾与思考】

【例题经典】

掌握一元二次方程的解法

例1  解方程:

    (1)3x2+8x-3=0;(2)9x2+6x+1=0;(3)x-2=x(x-2);(4)x2-2x+2=0

会判断一元二次方程根的情况

例2  不解方程判别方程2x2+3x-4=0的根的情况是(  )

    A.有两个相等实数根;    B.有两个不相等的实数根;

    C.只有一个实数根;      D.没有实数根

  【点评】根据b2-4ac与0的大小关系来判断

一元二次方程的应用

例3  (2006年包头市)某印刷厂1月份印刷了书籍60万册,第一季度共印刷了200万册,问2、3月份平均每月的增长率是多少?

  【点评】设2、3月份平均每月的增长率为x,即60+60(1+x)+60(1+x)2=200

【基础训练】

1.(2006年温州市)方程x2-9=0的解是(  )

    A.x1=x2=3           B.x1=x2=9       C.x1=3,x2=-3       D.x1=9,x2=-9

2.下列方程中肯定是一元二次方程的是(  )

    A.-ax2+bx+c=0       B.3x2-2x+1=mx2     C.x+=1         D.(a2+1)x2-2x-3=0

3.(2006年广州市)一元二次方程x2-2x-3=0的两个根分别为(  )

    A.x1=1,x2=-3       B.x1=1,x2=3

C.x1=-1,x2=3       D.x1=-1,x2=-3

4.在一幅长80cm,宽50cm的矩形风景画的四周镶一条金色纸边,制成一幅矩形图.如果要使整个挂图的面积是5400cm2,设金色纸边的宽为xcm,那么x满足的方程是( )

    A.x2+130x-1400=0     B.x2+65x-350=0

C.x2-130x-1400=0     D.x2-65x-350=0

5.两圆的半径分别是方程x2-3x+2=0的两根.且圆心距d=1,则两圆的位置关系是(  )

A.外切       B.内切       C.外离         D.相交

6.(2006年常德市)已知一元二次方程有一个根是2,那么这个方程可以是_______(填上你认为正确的一个方程即可).

7.方程(x-2)(x-3)=6的解为______.

 

8.(2006年成都市)已知某工厂计划经过两年的时间,把某种产品从现在的年产量100万台提高到121万台,那么每年平均增长的百分数约是________.按此年平均增长率,预计第4年该工厂的年产量应为_____万台.

 

9.若一个等腰三角形三边长均满足方程x2-6x+8=0,则此三角形的周长为_____.

 

 

 

 

 

 

 

 

【能力提升】

10.方程(m+1)|m|+1+(m-3)x-1=0.

    (1)m取何值时,方程是一元二次方程,并求出此方程的解;

(2)m取何值时,方程是一元一次方程.

 

 

 

 

 

 

 

11.解下列方程:

(1)x2-12x-4=0;                 (2)(2006年浙江省)x2+2x=2;

 

 

(3)(2006年芜湖市)x2-4x-12=0;  (4)(x+1)2-4=0

 

 

 

 

 

 

 

 

12.(2006年黄冈市)市政府为了解决市民看病难的问题,决定下调药品的价格.某种药品经过连续两次降价后,由每盒200元下调至128元,求这种药品平均每次降价的百分率是多少?

 

 

 

 

 

 

 

13.某商场将进货价为30元的台灯以40元售出,平均每月能售出600个.调查表明:这种台灯的售价每上涨1元,其销售量就将减少10个.为了实现平均每月10000元的销售利润,这种台灯的售价应定为多少?这时应进台灯多少个?

请你利用方程解决这一问题.

 

 

 

 

 

 

 

 

 

14.(2006年重庆市)机械加工需要用油进行润滑以减少摩擦,某企业加工一台大型机械设备润滑用油量为90千克,用油的重复利用率为60%,按此计算,加工一台大型机械设备的实际耗油量为36千克.为了建设节约型社会,减少油耗,该企业的甲、乙两个车间都组织了人员为减少实际耗油量进行攻关.

    (1)甲车间通过技术革新后,加工一台大型机械设备润滑油用油量下降到70千克,用油的重复利用率仍然为60%.问甲车间技术革新后,加工一台大型机械设备的实际耗油量是多少千克?

    (2)乙车间通过技术革新后,不仅降低了润滑用油量,同时也提高了用油的重复利用率,并且发现在技术革新的基础上,润滑用油量每减少1千克,用油量的重复利用率将增加1.6%.这样乙车间加工一台大型机械设备的实际耗油量下降到12千克.问乙车间技术革新后,加工一台大型机械设备润滑用油量是多少千克?用油的重复利用率是多少?

【应用与探究】

15.填空:

  (1)方程x2+2x+1=0的根为x1=____,x2=_____,则x1+x1=______,x1?x2=_____;

  (2)方程x2-3x-1=0的根为x1=____,x2=_____,则x1+x2=______,x1?x2=_____;

  (3)方程3x2+4x-7=0的根为x1=_____,x2=_____,则x1+x2=______,x1?x2=_____.

    由(1)(2)(3)你能得到什么猜想?并证明你的猜想.请用你的猜想解答下题

已知2+是方程x2-4x+C=0的一个根求方程的另一个根及C的值.

 

 

 

 

 

 

 

 

 

 

 

 

答案:

例题经典 

例1:(1)x1=-3,x2=  (2)x1=x2=-  (3)x1=1,x2=2  (4)x1=+,x2=- 例2:B  例3:设增长率为x列方程60+60(1+x)+60(1+x)2=200

考点精练 

1.C  2.D  3.C  4.B  5.B 

6.略  7.x1=0,x2=5  8.10%,146  9.6或10或12 

10.(1)m=1,x1=  (2)m=0或m=-1 

11.(1)x1=6+2,x2=6-2 

(2)x1=-1+,x2=-1-  (3)x1=6,x2=-2,(4)x1=-3,x2=1 

12.设百分率为x,则200(1-x)2=128,

解之得x1=1.8(舍去),x2=0.2,即百分率为20% 

13.设售价为x元,则(x-30)[600-(x-40)×10]=10000,

解得x=50,x=80,即售价为50元时进500个.售价为80元时进200个. 

14.解:(1)由题意,得70×(1-60%)=70×40%=28(千克).

(2)设乙车间加工一台大型机械设备润滑用油量为x千克.

由题意,得:x×[1-(90-x)×1.6%-60%]=12,

整理得x-65x-750=0,解得:x1=75,x2=-10(舍去),(90-75)×1.6%+60%=84%.

答:(1)技术革新后,甲车间加工一台大型机械设备的实际耗油量是28千克.(2)技术革新后,乙车间加工一台大型机械设备润滑用油量是75千克,用油的重复利用率是84%. 

15.(1)x1=-1,x2=-1,x1+x2=-2,x1?x2=1 

(2)x1=,x1+x2=3,x2=-1

 (3)x1=1,x2=-,x1+x2=-,x1?x2=- 

猜想:ax2+bx+c=0的两根为x1与x2,则x1+x2=-,x1?x2=

应用:另一根为2-,C=1

 

 

试题详情

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