单项选择题
This passage is mainly
A.about a new application of computers.
B.a review of a science-fiction movie.
C.about the synthesizing interesting DNA.
D.a survey of scientific breakthroughs.
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单项选择题
It can be inferred from the text that the synthesizing DNA technology should be used
A.extravagantly and freely.
B.flexibly and excessively.
C.reasonably and cautiously.
D.openly and vigorously.
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单项选择题
The expression hew very closely to can be best replaced by
A."shed light on".
B."adhere strictly to".
C."stay away from".
D."give play to".
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