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第1题

Unless we spend money to spot and prevent asteroids (小行星)now, one might crash into Earth and destroy life as we know it,
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第2题

Why does cram go bad faster than butter?Some researchers think they have the answer, and it comes down to the structure
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第3题

Believe it or not, optical illusion (错觉)can cut highway crashes. Japan is a case in point. It has reduced autom
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第4题

下面属于专家意见调查法的有（ ） A.专家会议法 B.指标判断法 C.德尔菲法 D.扩散指数法
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