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Broken rubber bands and flat tires requi...

Broken rubber bands and flat tires requiring replacement could soon be a thing of the past.

说明: 学科网(Zxxk.Com)French researchers have developed a new kind of rubber that can repair itself when broken.The new rubber is made from widely available materials including vegetable oil and a common industrial chemical.All the materials are considered safe to the environment and can be easily reused.

The best part is that the new rubber can be repaired and used again and again without losing its strength or ability or stretch.When cut, the rubber can be made new again, simply by pressing the two broken ends back together.

说明: 学科网(Zxxk.Com)The product can be repaired at room temperature, around twenty degrees Centigrade;other self-healing materials require higher temperatures for repair.

Traditionally, rubber substances are made from huge molecules(分子)connected by strong chemical links, or bonds.The new rubber is made of smaller molecules.The molecules are linked together using hydrogen bonds.When connected in this way, the molecules act like one long molecule, forming what is called supramolecular networks(超分子网).When the rubber is cut, the molecules attempt to connect with whatever molecule is near them.When pressed together, the molecules are able to repair themselves at the molecular level, making the repaired rubber like new.

说明: 学科网(Zxxk.Com)However, time is an important element in the process.If the broken ends are not brought together quickly, a repair is not possible.This is because molecules will form bonds with molecules on their own side.The inventors say the surfaces of the rubber can be repaired within a week of being separated.

The rubber is the creation of scientists at the Industrial Physics and Chemistry Higher Education Institution in Paris.The organization is part of France's National Center for Scientific Research.The new material is described in greater detail in the research publication Nature.

说明: 学科网(Zxxk.Com)1.According to the introduction, which of the following is NOT the advantage of the new rubber?

A.It can be made as easily as common rubber.

说明: 学科网(Zxxk.Com)B.It is environmentally-friendly.

C.It can repair itself at room temperature.

说明: 学科网(Zxxk.Com)D.It is made of smaller molecules.

2.What does the 5th paragraph mainly tell us?

说明: 学科网(Zxxk.Com)A.Why the new rubber is unique.

B.Why the new rubber can repair itself.

说明: 学科网(Zxxk.Com)C.The new rubber is made from huge molecules.

D.The new rubber is different from the common rubber.

说明: 学科网(Zxxk.Com)3.If we want to know more about the technology of this kind of new rubber, where can we get the information?

A.In the researchers' diary.    B.In a guide book.

说明: 学科网(Zxxk.Com)C.In a research magazine.       D.In a newspaper.

 

1.D2.B3.C 【解析】略
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   阅读下面短文,从短文后所给各题的四个选项A,B,C,D中选出能填入相应空白处的最佳选项,并在答题卡上将该项涂黑。

A very little boy was spending his Saturday morning playing in his sandbox. He had with him a plastic pail (桶) and a shiny, red plastic shovel (铲). In the   36   of creating roads and tunnels in the sand, he   37   a large rock in the middle of the sandbox.

The boy dug around the rock,   38   to move it off the dirt. At first, he wanted to carry it out of the sandbox with his hands; however, it was too heavy. Later, with much   39  , he pushed the rock across the sandbox by   40   his hands. When the boy got the rock to the   41   of the sandbox, he found that he couldn’t roll it up and   42   the little wall.   43  , the little boy pushed, but every time he thought he had made some   44  , the rock tipped (翻滚) and then fell back into the sandbox. The little boy pushed and pushed, but his only   45   was to have the rock roll back.

Finally he   46   tears. All this time the boy’s father watched from his living room window   47   the drama was unfolded. The moment the tears fell, a large   48   appeared across the sandbox. It was the boy’s father. Gently but   49  , he said, “Son, why didn’t you use all the strength that you had?”

Defeated, the boy   50   back, “I did! I did! I used all the strength that I had!”

“No, you didn’t. You didn’t ask me for help.” The father   51   down, picked up the rock and dropped it off the sandbox.

Do you have “rocks” in your life that need to be   52  ? Are you discovering that you don’t have   53   it takes to lift them? There is someone who is willing to give us the   54   we need. Maybe, it’s sometimes a good idea to ask others for   55   when we meet difficulties we can’t overcome.

1. A. method                B. step         C. practice         D. process

2. A. created               B. set          C. discovered           D. brought

3. A. trying                B. managing     C. deciding         D. competing

4.A. thought                B. struggle     C. movement         D. worry

5.A. touching           B. shaking      C. using                D. controlling

6. A. bottom                B. center           C. edge             D. front

7.A. over               B. down         C. through          D. into

8. A. Doubted           B. Surprised        C. Pleased          D. Determined

9. A. attempt               B. progress     C. effort               D. decision

10. A. hope             B. reward           C. point                D. purpose

11. A. made out         B. broke out        C. burst into           D. rushed into

12. A. so                   B. as           C. until                D. before

13. A. rock             B. picture          C. figure               D. shade

14.A. surprisingly          B. doubtfully       C. kindly               D. firmly

15. A. shouted              B. smiled           C. called               D. asked

16. A. reached              B. looked           C. fell             D. put

17. A. pushed               B. dropped      C. carried              D. removed

18. A. who              B. what         C. which                D. where

19. A. minds                B. spirits          C. force                D. strength

20. A. help             B. tips         C. advice               D. ideas

 

 

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A. Should         B. Will      C. May     D. Can 

 

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A. to recognize     B. recognizing    C. recognize     D. recognized

 

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A. shows     B. proves    C. makes    D. performs    

 

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--Mum, I don’t think I am qualified enough to do this.

--Honey, be confident! You should know it is ____ a man thinks of himself ___ really determines his fate.

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