Biologists believe that they have found one of the substances that tell individual genes both when to become active and when to remain quiescent in the earliest phases of an embryo’s development. (A) tell individual genes both when to become active and when to remain (B) tell individual genes both at which time they should become active or should remain (C) tells individual genes both when to become active or remain (D) tells individual genes both when to become active or when to remain(A) (E) will tell an individual gene both about when it should become active and remain 这道题目没人讨论过,再捞上来 为什么选择D呢?按照法则或者携隐的说法都应该选tell,何况这里面还有一个明显的both...and...所以我觉得答案是A啊! 还有一个问题,为什么individual genes后面要用genes这个复数呢?individual不是应该是单数吗?
[此贴子已经被作者于2008-9-30 12:12:22编辑过] |