题目内容

C

  Things similar continuously happened in Haiti and Chile．Thousands of people were

buried in the earthquake and lost their fives．What if we could have warned them? People are always trying hard to find a way of preventing building collapsing(坍塌)．Better materials and technology help，but are not a solution．Just like humans，a building has its own life circle from  “birth” to “death”．If we know when a building is going to collapse，we can repair it in advance or get out before it falls．

    Now, scientists at the University of Illinois ha、，e developed a material that turns red before it breaks．The invention could be used in things like climbing ropes，or bridge supports．The secret behind the color-changing material is a type of molecule(分子)．A molecule is a group of atoms held together by chemical bonds(化学键)．Imagine you and your friends standing in a circle，holding hands．Each person stands for one atom，your hands represent the bonds，and the entire circle represents a molecule．If one person lets go of his or her hands，the molecule changes color．The research team put the molecule into a soft material．When the researchers stretched(拉长) the material：it turned bright red a few seconds before it broke into two pieces．

When they repeatedly stretched and relaxed the material，without breaking it，it only turned a little red．

The major problem is，light can get rid of the red color．When the team shone a bright light on the molecule，the broken bond was fixed，and the color disappeared．If bright fight keeps the red color from appearing，the material’s warning system will be useless．Scientists still have a lot of work to do before the color-changing molecule can be used outside the lab．

49.The passage is mainly about______________

A．a way of preventing building from breaking down

B．a series'-of earthquakes in Haiti and Chile

C．a way of warning before buildings collapse

D．a newly—discovered structure of a molecule

50.According to the passage，we call conclude that____________

A．there are problems to solve before putting the new material to use

B．scientists have found the life circle of buildings from “birth” to “death”

C．bright fight makes the red color visible to human eyes

D．the new material is unlikely to be used in building bridges

51.The color-changing molecule can___________

A．make building materials much stronger

B．help building materials get stretched if necessary

C．prevent the earthquake from killing people

D．remind people to leave buildings before they fall

52．The warning system is based on the fact that____________

A．red color won’t show up when it meets bright fight

B．a material with a certain type of molecule Can turn red when setched

C．a building has its own life circle of “birth”to“death”

D．the broken bond will fix itself when a molecule meets bright fight

49．C     50．A 51．D 52．B

练习册系列答案
相关题目

阅读下面短文，掌握其大意，然后从1-15各题所给的A、B、C、D四个选项中，选出最佳选项。

Several factors make a good newspaper story. First，  1   ，it must be new. But since TV can react to events so quickly, this is often a problem for    2  . They usually respond    3   it in one of three ways.

One by providing   4   detail, comment or background information.

One by finding a new   5  on the day’s major stories.

One by printing completely different stories which   6   doesn’t broadcast.

What else? Well—it also has to be   7  . People don’t want to read about    8   , everyday life. Because of this, many stories   9   some kind of conflict or danger. This is one reason why so much news seems to be   10  news , “ Plane lands safely—no-one hurt ”doesn’t sell newspapers. “Plane  11  —200 feared dead !” does .

Next, there’s human interest. People are interested in other   12   —particularly in the rich, famous and powerful. Stories about the private lives of pop singers, actors, models, politicians,   13  , all appear regularly in certain newspapers .

Finally, for many editors,   14   is an important factor, too. They prefer stories about people, places and events which their readers know. That’s   15   the stories in Tokyo’s newspapers are often very different from the stories printed in Paris, Cairo, New York or Buenos Aires.

A .gradually     B. extremely         C. obviously           D. precisely

A. newspapers    B. publications     C. reporters        D. broadcasters

A. with          B. on               C. of               D. to

A. extra         B. available       C. reliable          D. memorable

A. direction      B. look           C. angle           D. section

A. TV            B. internet          C. newspaper          D. radio

A. conventional   B. dramatic        C. professional     D. sensitive

A. common       B. usual            C. ordinary         D. special

A. urge         B. neglect          C. increase        D. involve

A. good        B. bad            C. exciting         D. informative

A. crashes      B. bumps          C. strikes          D. drops

A. places       B. people          C. things          D. news

A. in addition   B. in any case       C. for example     D. after all

A. personality   B. similarity        C. tolerance       D. familiarity

A. that                B. why             C. because D. what

Several factors make a good newspaper story. First, obviously, it must be new. But since YV can react to events so quickly, this is often a problem for __1__. They usually respond to it in one of the three ways.

By providing __2__ derails, comment or background information.

By finding a new __3__ on the day’s major stories.

By printing completely different stories which TV doesn’t broadcast.

What else? Well, it also has to be __4__. People don’t want to read about ordinary, everyday life. Because of this, many stories __5__ some kind of conflict or danger. This is one reason why so much news seems to be __6__ news. “Plane lands safely, no more hurt” doesn’t sell newspaper. “Plane __7__, 200 feared dead!” does.

Next, there’s human interest. People are interested in other __8__－particularly in the rich, famous and powerful. Stories about the private lives of pop singers, actors, models, politicians, __9__, all appear regularly in certain newspapers.

Finally, for many editors, __10__ is an important factor, too. They prefer stories about people, places and events which their readers know. That’s why the stories in Tokyo’s newspapers are often very different from the stories presented in Paris, Cairo, New York or Buenos Aires. 

A. newspapers     B. publications       C. reporters    D. broadcasters

A. extra       B. available    C. inaccessible       D. memorable

A. direction  B. look    C. angle  D. section

A. tragic      B. dramatic     C. professional       D. sensitive

A. quote      B. neglect       C. increase      D. involve

A. good       B. had     C. exciting      D. informative

A. crashes    B. bumps C. strikes D. drops

A. places      B. people C. things D. news

A. in addition      B. in any case C. for example       D. after all

A. personality B. similarity      C. uniqueness  D. familiarity

阅读下面短文，从短文后各题所给的四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项，并在答题卡上将选项涂黑。

One day Tom bought , for two dollars , a large number of second-hand books . He put them in a  21  and pulled them to the   22   . He had to remain at work  23   three in the morning .

At three , he began to walk home . The streets were dark . Tom could   24   wait to arrive home to begin reading his new books . “  25   ! ” a voice shouted . But Tom was too  26    to hear the shout . A moment later , a gunshot went  27   his ear . He heard the shot . Tom turned to see what was  28   . An angry policeman ran towards him . The policeman didn’t  29   that the bag was Tom’s . He shouted at Tom , “   30    it !”

“Open it ! ” the policeman   31    .

Tom opened it and the old books fell out of it .

“Why did you not stop  32   when I shouted ?” the policeman asked , “If I could shoot  33   , you would be dead .”

“I didn’t  34   you , ” Tom said , “ I am almost deaf . ”

The policeman told Tom he was  35   for having shot at him . “  36   would be better for you not to walk on the  37   at night . ” he said .

Tom smiled , and told the policeman that his job   38   a clerk in the telegraph office was a  39   job . The policeman could think of  40   to answer this .

A. basket      B. box          C. desk         D. bag

A. office      B. bedroom      C. bookstore     D. police station

A. at          B. by          C. until          D. to

A. eagerly     B. really        C. hardly         D. almost

A. Stop       B. Thief         C. Hello         D. Danger

A. nervous     B. excited       C. delighted      D. frightened

A. off         B. into          C. from          D. past

A. breaking    B. taking        C. happening     D. following

A. say         B. think         C. hope         D. wish

A. Fall        B. Throw        C. Drop         D. Keep

A. ordered     B. asked         C. begged       D. wanted

A. hearing      B. running       C. crying       D. carrying

A. earlier       B. later         C. worse        D. better

A. recognize    B. hear         C. know         D. understand

A. careless     B. brave         C. angry        D. sorry

A. It          B. That          C. Things        D. This

A. way        B. ground        C. streets        D. shops

A. like         B. as           C. with         D. of

A. dawn        B. daytime      C. dark         D. night

A. nothing      B. everything    C. anything      D. something

EVENTS

Bicycle tour and race

　　A bike tour and race will be held on August 26 and 27(Sat. & Sun.). At 5:30am, the riders will leave Tian'anmen Square and ride the first 35 kilometres as a training leg. Then the next 55 kilometre leg, from Yanjiao to Jixian, will be the first competitive part of the tour. The riders and their bikes will then be taken from Jixian to Changli.

　　The second racing leg of the tour will be from Changli to the seaside of Nandaihe, covering a distance of 20 kilometres. Saturday night includes the stay at Nandaihe and supper. Sunday morning is free for play at the seaside. At noon all the people and their bikes will be taken back to Beijing.

　　Cost: 200 yuan    Telephone: 4675027

Brazilian footballers

　　The Brazilian Football Club will play Beijing Guo'an Team at the Workers Stadium on August 26. The club has four national team players . Also coming is 1994 US World Cup star　Romario. He has promised to play for at least 45 minutes.

　　Ticket prices: 60, 100, 150 yuan

　　Time/Date: 4:30 pm, August 26(Sat.)    Telephone: 5012372

Rock climbing

　　The Third National Rock Climbing Competition will be held on August 26-27 at the Huairou Mountain-climbing Training Base. More than 10 teams from Beijing, Wuhan, Dalian, Jilin and other places will take part in it. A Japanese team will give an exhibition climbing. Free for spectators(观众).

　　Take a long-distance bus from Dongzhimen to Huairou.

　　Time/Dates: 9-12 am, August 26 and 27

Telephone: 7143177, 7144850, Wang Zhenghua

45. 1.The main purpose of announcing the above events is to give information about __________.

A. visiting teams                                         B. famous players

　 C. things to do for the weekend             D. prices to pay for the sports events

46. 2.If you take part in the bike tour, you will ride for __________.

A. 35 kilometres   B. 55 kilometres    C. 75 kilometres   D. 110 kilometres

47. 3.What is special about the rock climbing competition?

A. A foreign team takes part in it.

B. You can watch it without paying.

C. You don't have to be a sportsman to take part.

D. The bus trip to the place of the competition is free.

48. 4.If you want to find something to do for Saturday afternoon, which telephone number will you call?

　 A. 4675027　　　　B. 7143177                  C. 5012372　　　　D. 7144850

 

Americans have taken over from the Indians many things besides their continent! Where did corn, potatoes, tomatoes, chocolate and maple sugar come from? The Indians. Who invented moccasins, snowshoes and hammocks? The Indians!

A list of the tools, plants, materials and designs we owe to the Indians would include hundreds of items. But there is something far more familiar, something that is always at hand. It is used daily by every American: a large vocabulary of Indian words.

Potato, tomato, chocolate, moccasin and hammock came into English from Indian languages. So did cocoa, tobacco, maize (an Indian word for corn) and succotash. Some words have changed on the way. Potato, for example, comes from a word that sounds like “batata”. Cocoa began as “cacahuatl”.

Some meanings have also changed. The long Indian word from which succotash comes means “something broken off in bits”. Indian women often varied their dishes by mixing bits of one food with another. White men who ate an Indian dish of mixed lima beans (青豆) and corn began using the Indian word to mean this particular mixture.

Put on your moccasins and take a walk in the country. If it is a cold day and you wear a mackinaw, your jacket will be as Indian as your shoes. But mackinaw came from “michilimackinac”, the Indian name of a place where a fort (集市) served as a trading post. Bright-colored blankets or jackets bought at the post soon became known as “mackinaws”.

Early white visitors to the continent found Indian words useful for the things new to them. But some Indian sounds, such as the “tl” at the end of many words, were hard to say. That is why “coyotl” became coyote and “tomatle” became tomato.

Some words simply seemed too long. So, “musickwautash” became succotash and “rockahominy” became hominy.

1.The first two paragraphs may serve as a(n)     .

A. explanation    B. introduction    C. comment    D. background

2. Which of the following has been changed for easier pronunciation?

A. Batata        B. Chocolate     C. Tomatle     D. Rockahominy

3. Some words have changed because       .

A.  they are too long

B.  nobody can use them

C.  the things they refer to have disappeared

D.  they are too difficult for people to write

4. What is the passage mainly about?

A.  How Indian traditions affect us.

B.  Why Indian words were changed.

C.   Things we owe to the Indians.

D.  Indian words all around us.

 

 

违法和不良信息举报电话：027-86699610 举报邮箱：58377363@163.com

精英家教网