第三节:完形填空:(共10小题,每小题2分,满分20分)

阅读下面短文,掌握其大意,然后从21~30各题所给的A、B、C和D项中,选出最佳选项,并在答题卡上将该项涂黑。

Without the atmosphere there would be no weather, wind, rain, snow or clouds. Air is all around us, we live at the bottom of a great ocean of air. It is invisible, but we can     1     it when it moves. There are miles of air above us,     2    down with great weight on the earth and everything on it. Because air presses down on us from all      3    at the same time, and because we are able to bear this weight, we do not seem to feel it.    4  , scientists have proved that air has this weight, and that    5   that has weight creates a force called pressure. As changes in air pressure take place, they make air    6 .

Air is a gas that expands when heated, gets lighter, and moves    7  . When air is cooled, it gets heavier, sinks close to the earth’s surface, and flows like water in a great river. As warm air rises, cold air rushes     8   to take its place. Thus wind originates. The wind that blows high above us is caused by the warmer air running away from   9   air. The wind we feel near the earth’s surface is the heavy colder air trying hard to    10    the warmer air. Changes in temperature cause the air to move.

1. A. feel         B. taste         C. smell        D. touch

2. A. putting      B. getting        C. turning      D. pressing

3. A. ways        B. directions     C. oceans       D. rivers

4. A. So          B. While        C. However     D. Unless

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

6. A. move        B. rise          C. fall         D. stay

7. A. inward       B. downward    C. upward      D. outward

8. A. out          B. in           C. away       D. up

9. A. colder        B. warmer      C. lighter      D. heavier

10. A. absorb       B. catch         C. feel        D. prevent

Every baby born a decade from now will have its genetic code (基因编码) mapped at birth, the head of the worlds’ leading genome sequencing (基因图谱) company has predicted.

A complete DNA read – out for every newborn will be technically possible and affordable in less than five years, promising a revolution in healthcare, says Jay Flatley, the chief executive of Illumina. Only social and legal problems are likely to delay the age of “genome sequences,” or genetic profiles. By 2019 it will have become routine to map infants’ genes when they are born, Dr Flatly told The Times.

This will open a new approach to medicine, by which conditions such as high blood pressure and heart disease can be predicted and prevented and drugs used more safely and effectively.

A baby’s genome can be discovered at birth by a blood test. By examining a person’s genome, it is possible to identify raised risks of developing diseases such as cancers. Those at high risk can then he screened more regularly, or given drugs or dietary advice to lower their chances of becoming ill.

Personal genomes could also he used to ensure that patients get the medicine that is most likely to work for them and least likely to have side – effects.

The development, however, will raise legal concerns about privacy and access to individuals’ genetic records.

“Bad things can be done with the genome. It could predict something about someone – and you could possibly hand the information to their employer or their insurance company.” said Dr Flatley.

“People have to recognize that this horse is out of the barn, and that your genome probably can’t be protected, because everywhere you go you leave your genome behind. Complete genetic privacy, however, is unlikely to be possible”, he added.

As the benefits become clearer, however, he believes that most people will want their genomes read and interpreted. The risk is nothing compared with the gain.

In the first two paragraphs, the author mainly wants to tell us about         .

      A.the significant progress in medicine      

       B.the promise of a leading company

       C.the information of babies’ genes    

       D.the research of medical scientists

Which of the following is a problem caused by this approach?

       A.The delaying in discovering DNA.

       B.The risk of developing diseases at birth.

       C.The side – effects of medicine on patients.

       D.The letting out of personal genetic information.

What does the underlined sentence “… this horse is out of the barn” mean?

       A.Genetic mapping technique has been widely used.

       B.Genetic mapping technique is too horrible to control.

       C.People are eager to improve genetic mapping technique.

       D.people can’t stop genetic mapping technique advancing.

What’s Dr Flatley’s attitude towards the technology?

       A.Tolerant.   B.Conservative.   C.Positive.   D.Doubtful.

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