Prep096 语法求教！求帮助！

kaneqiao · 发表于 2011-8-9 23:20:42

96. (29707-!-item-!-188;#058&003977)

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

选D，请问 it 代指什么？为什么不选E。。感觉语法笔记上没讲清楚。

Serena0710 · 发表于 2011-8-9 23:28:54

我想it是指代the number of chirps ,逻辑意思是chirps的数量可以作为一个近似的温度计。因为逗号后有and，表并列，所以用it就毫不疑问的指代前一个主句的主语。我这么解释有点虚，表达的不太好，不知道楼主能明白不？

sukieyy · 发表于 2011-8-10 01:23:16

it指代number,另外原句中表明 and后面的句子应该是和前面的句子并列的，而不是像E选项那样变成doing, E的句子结构变了就。。。我是这么理解的。。

kaneqiao · 发表于 2011-8-10 11:12:41

有点明白了。。

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