试题与答案

骑自行车的人上坡前往往要加紧蹬几下,这样的目的是( ) A.增大车的动能 B.增

题型:选择题

题目:

骑自行车的人上坡前往往要加紧蹬几下,这样的目的是(  )

A.增大车的动能

B.增大车的势能

C.增大车的惯性

D.无法判断

答案:

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参考答案:D

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题型:完形填空

根据上下文,在每个空格处填入一个适当的单词,使文章意思通顺、前后连贯、结构完整。

Nowadays, with the development of science and technology, cloning has become a hot topic for many people. Some people are against it ,while others are in favour   小题1:   it. Personally, I wouldlike to say that cloning is good 小题2:  the human race.

 小题3:  , cloning technology proves helpful for genetics researchers. With cloning technology, scientists   小题4: bring some animals that are extinct back to life. Secondly, cloning body parts can serve as a lifesaver for people    小题5:   are seriously ill. When a body organ such as a kidney or heart fails to function, it may be possible to replace it    小题6:  a cloned one. Thirdly, if a couple can’t have    小题7: child, human cloning technology will make it possible for them to have a child. All in all, I firmly believe that cloning is beneficial 小题8:  the human race.

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