96. 

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 但是 这个答案 中的It 指代什么呢，是the number of chirps  吗，如果是，把the number of chirps  代入句中，变成the number of chirps can in fact serve.....,进一步简化：the number can in fact serve.....,意思好像有点别扭，请NN指教。

如果理解为分词壮语修饰整个句子表状态行吗？

为什么一定要修饰attract呢？

有NN帮忙吗？

刚做了这个题

PREP笔记的解释是serving做伴随状语会引起逻辑上混乱和误解,有可能会认为是修饰

temperature