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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
我在D和E中徘徊，虽然我最后还是选了D，但是有疑问
1、D中，it是否指代不清？如果it指代number,那不成了GMAT经常考的run-on了吗？如果it指代前面一句话，那不是应该用ing或者新名词么？
2、我排除E的理由
后面用ing，意思是number的rises and falls事实上确实是一种温度计，而句子意思是”可以做为“一个温度计，逻辑上似乎有问题
但我不确定。我这个想法来自于OG11 122题对C的解释
”McClintock's simile creates an image that is not real; the use of the verb
do indicates the pearls' movement as a reality“
还有人说E的possibly用法错，但我不明白哪里错了
期待NN解答
http://forum.chasedream.com/dispbbs.asp?boardid=23&replyid=2865523&id=311105&page=1&skin=0&Star=1
有关此题，前人已经有些讨论。这个链接希望可以解答你的疑惑。
在Prep破解版里，有关possibly的用法错误，是因为选项A里面的情态动词通常不能省略或更改，在正确选项中应该保留can或者相应的语气。而possibly的意思与can不同，不能随便代替。
但是，我仍然有和你同样的疑问就是D选项的谓语动词在哪里？
In some species of cricket, the number of chirps per minute used by the male to attract females rises and falls in accordance with the surrounding temperature, and it can in fact serve
as an approximate thermometer.
把D选项代入原文，得到的句子中，我找不到and前一句的谓语动词。
强烈期待NN解答啊！！！
Thanks a lot!
I'm suddenly enlightened!
In some species of cricket, the number of
chirps per minute used by the male to attract females rises and falls in accordance with the surrounding temperature, and it can in fact serve
as an approximate thermometer.
it指代单数主语the number of chirps, 与未划线部分as an对应。这样理解就清晰了。
谢谢
那是不是就是说, “主语+句子, and 主语/代词+句子”是正确的；而 “主语+句子 and 主语/代词+句子（没有逗号）”是错误的呢？
http://forum.chasedream.com/dispbbs.asp?boardid=23&replyid=2865523&id=311105&page=1&skin=0&Star=1
有关此题，前人已经有些讨论。这个链接希望可以解答你的疑惑。
在Prep破解版里，有关possibly的用法错误，是因为选项A里面的情态动词通常不能省略或更改，在正确选项中应该保留can或者相应的语气。而possibly的意思与can不同，不能随便代替。
但是，我仍然有和你同样的疑问就是D选项的谓语动词在哪里？
In some species of cricket, the number of chirps per minute used by the male to attract females rises and falls in accordance with the surrounding temperature, and it can in fact serve
as an approximate thermometer.
把D选项代入原文，得到的句子中，我找不到and前一句的谓语动词。
强烈期待NN解答啊！！！
非常感谢
还有疑问，就是D中的it有没有指代不清的嫌疑呢？
还有我排除E的理由是否正确呢？
继续期待答案
语法题目的答案是比出来的。
这题D里面的it没有指代不清的嫌疑呀。因为用排除法，其他选项都有明显错误。
E错误的原因：请看我找到的链接，有关possibly用法。另外，serving放在句末做伴随状语使用错误，有作后置定语修饰temperature的歧义存在。
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