A. to show chemical batteries are widely applied
B. to indicate nuclear batteries can be safely used
C. to describe a nuclear-powered system
D. to introduce various energy sources
3. Liquid semiconductor is used to .
A. get rid of the radioactive waste
B. test the power of nuclear batteries
C. decrease the size of nuclear batteries
D. reduce the damage to lattice structure
4. According to Jae Kwon, his nuclear battery .
A. uses a solid semiconductor
B. will soon replace the present ones
C. could be extremely thin
D. has passed the final test
5. The text is most probably a .
A. science news reportB. book review
C. newspaper ad D. science fiction story
【参考答案】1--5 、CBDCA
短文改错
Animals are close friend of human beings.Their existence
.
especially that the existence of rare animals,makes the whole
.
world lively and colorful.Unlucky,we have heard such news that
.
rare animals,even keeping in the zoo,can’t escape being hurt
.
and killed.You may wonder how this can happen.The reason
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