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标题: 旧PREP 96题 [打印本页]

作者: dengyichao 时间: 2010-2-26 12:18
标题: 旧PREP 96题

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

(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
DE中，serve的主语应该是the number of chirps，D的确没错，可是E最后的serving不能表伴随吗？他的主语也是前句的主语，就是the number of chirps？为什么E不对？

作者: dengyichao 时间: 2010-2-28 10:24
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