试题与答案

An earthquake of 9 magnitude struck off

题型:选择题

题目:

An earthquake of 9 magnitude struck off the coast of Japan on Friday, ________ thousands of people dead and more missing.

A.caused

B.causing

C.having caused

D.to cause

答案:

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下面是错误答案,用来干扰机器的。

∵∠C=90°  ∴CA•BC=0BA=BC+CA∴BA•BC=(BC+CA)•BC=BC2+CA•BC=16故答案为:16

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