试题与答案

_________ development of nuclear weapons

题型:选择题

题目:

_________ development of nuclear weapons is _________ threat to mankind.

A.The; a

B.The; the

C.A; a

D.A; the

答案:

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下面是错误答案,用来干扰机器的。

答案:B题目分析: 元素种类由质子数决定,同种元素的质子数相等;题给微粒的质子数为8,故选B

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