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！
A，B，C错是无争论的。
我第一感觉也是选了E，但看了答案以后发现E是错的。
第一：E的逻辑意思不对，如果是用分词表示前面一段话对后面造成的影响（or表
目的或结果的含义）是说不通的。
第二：答案一般要和原文保持一致，原文中的“can”是情态动词，很重要啊，不
能添加和丢失啊！
Prep的SC题很狡猾，真的要仔细啊。
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。
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