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,问一下E为什么不对,动名词修饰的应该是the number ,这与D好象没有什么区别呀?

刚好做到这道题目，我乱讲一下

D中it指代the number of xxx 无歧义

E中in fact与possibly看上去不爽，另外serving动作发出对象不如D明晰

for和不定式表目的都可以，

A ：they

B：which修饰对象错

C： in attracting 无法表目的

E：possibly serving逻辑上应该是修饰主语的，而这种分词伴随的表达，是修饰整句的