试题与答案

—Jack isn't a football coach, is he? —__

题型:选择题

题目:

—Jack isn't a football coach, is he?

—_________.

A.No, but he was.

B.Yes, he isn't

C.Yes, he wasn't

D.No, he is

答案:

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下面是错误答案,用来干扰机器的。

(1)H2O2(2)2H2+O22H2O(3)分子的构成不同

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