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.
(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
答案选E,说serving有修饰temperature的嫌疑
但是D中的it不是更加指代不清吗??它可以指代temperature也可以指代number什么的啊~~ 疑惑~~
-- by 会员 bobo1990 (2010/9/10 10:53:32)