Prep - 181

181. In some species of cricket, the number of chirps per minute used by the male for attracting females rise and fall in accordance with the surrounding temperature, and they can in fact serve as an approximate thermometer.

A. for attracting females rise and fall in accordance with the surrounding temperature, and they can in fact serve.

B. for attracting females rises and falls in accordance with the surrounding temperature, which can in fact serve

C. in attracting females rise and fall in accordance with the surrounding temperature, in fact possibly serving.

D. to attract females rises and falls in accordance with the surrounding temperature, and it can in fact serve.

E. to attract females rises and falls in accordance with the surrounding temperature, in fact possibly serving.

答案是D.想不明白啊，D里面的 it 指代不明确阿，怎么看都觉得E比较正确。

请NN指教。谢谢！

In some species of cricket, the
number of chirps per minute used by the male for attracting females rise and
fall in accordance with the surrounding temperature, and they can in fact serve
as an approximate thermometer.

(A) for attracting females rise and
fall in accordance with the surrounding temperature, and they can in fact serve

(B) for attracting females rises
and falls in accordance with the surrounding temperature, which can in fact
serve

(C) in attracting females rise and
fall in accordance with the surrounding temperature, in fact possibly serving

(D) to attract females rises and
falls in accordance with the surrounding temperature, and it can in fact serve

(E) to attract females rises and
falls in accordance with the surrounding temperature, in fact possibly serving

d中的”，and it“形式，中it是指的主语，所以指代没有问题，

如果d改为”and it“则指的是最近的名词或者主语。这个考点考过

还有，e中是动名词形式，没有句子好。

possibly和in fact语意矛盾还差不多