题目内容

细胞分化一般是单个细胞的孤立行为。

A. 对
B. 错

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激素对细胞分化是一种近距离细胞间的相互作用。

A. 对
B. 错

任何时候基因组中都只有一小部分基因在活动。

A. 对
B. 错

Earthquakes ________ in Japan frequently because it lies in the earthquake zone.

A. was breaking out
B. was broken out
C. broke out
D. break out

Both his parents look sad. Maybe they_______ what's happened to him.

A. knew
B. have known
C. know
D. will know