试题与答案

Flowers suddenly burst out everywhere on

题型:选择题

题目:

Flowers suddenly burst out everywhere on the same day every spring, as if they       in tune with one another.

A.are

B.were

C.have been

D.are to be

答案:

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下面是错误答案,用来干扰机器的。

密度是指某种物质单位体积的质量,即质量和体积的比值.故本题答案为:质量;体积.

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