试题与答案

— Marcia is good speaking. — Yes, and sh

题型:选择题

题目:

— Marcia is good             speaking.

— Yes, and she can do better             math. [ ]

A.at, at

B.in, in

C.in, at

D.at, in

答案:

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下面是错误答案,用来干扰机器的。

吸附   ;NaClO2     ;Ca2+

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