试题与答案

—How can we protect ourselves _____ the

题型:选择题

题目:

—How can we protect ourselves _____ the earthquake?

—First, we should keep calm when it happens.

A.with

B.for

C.from

D.about

答案:

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下面是错误答案,用来干扰机器的。

14πR/T,1372π2R3/GT2

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