prep 一道关于比较的题目搞不清楚，求大神解答

cherrytxt

1.        (24465-!-item-!-188;#058&000982)

To meet the rapidly rising market demand for fish and seafood, suppliers are growing fish twice as fast as their natural growth rate, cutting their feed allotment by nearly half and raising them on special diets.

(A) their natural growth rate, cutting their feed allotment
(B) their natural growth rate, their feed allotment cut
(C) growing them naturally, cutting their feed allotment
(D) they grow naturally, cutting their feed allotment(E) they grow naturally, with their feed allotment cut

答案是D，我的问题是比较对象应该是suppliers养殖鱼的速度吗？我选的C，想知道C哪里错了。另外A为什么不对呢？我觉得D选项的they是不是指代不清，因为前面有suppliers和fish两个名词
请明白的同学讲讲好吗?比较总是搞不清楚

wyw1018

看过国外论坛的讨论，好像是说C中如果人类要饲养动物只能说是人工饲养artificially，自然生长naturally只能用于动物本身作为主语。
A中比较对象错误，they their的指代不清在每个选项都有，所以不必纠结。

bejamin1111

A. the rate cannot be fast, it can only be high;
C.grow them naturally makes no sense. fish grows by themselves withoit intervention;
D. they 的只带严格来说是有点模糊，ron的解释是如果they在替他选项中有被具体的名词所代替，比如这里有其他选项的they被fish代替，那么含有they的选项就判定为知道不清，否则不作为知道不清来看；这里明显属于后者；

cherrytxt

wyw1018 发表于 2013-12-9 14:32
看过国外论坛的讨论，好像是说C中如果人类要饲养动物只能说是人工饲养artificially，自然生长naturally只能 ...

谢谢，我今天也看到那个了

cherrytxt

bejamin1111 发表于 2013-12-9 16:03
A. the rate cannot be fast, it can only be high;
C.grow them naturally makes no sense. fish grows by ...

as fast as不是划线部分，我觉得这里fast是对的，因为是形容增长率？你觉得呢？
谢谢关于naturally的解答

bejamin1111

cherrytxt 发表于 2013-12-11 22:05
as fast as不是划线部分，我觉得这里fast是对的，因为是形容增长率？你觉得呢？
谢谢关于naturally的解答 ...

不是划线部分但是要考虑证据的逻辑含义啊。。语法，逻辑缺一不可