◎ 题干
It is predicted that a comet will probably hit the earth in about 10 years and scientists all over
the world are thinking about possible ways to ________it from happening. Which of the following
is not OK?   
[     ]

A. protect    
B. stop    
C. keep    
D. prevent

◎ 答案
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◎ 解析
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◎ 知识点
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