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.