快要考试了，想问大家一个语法问题，谢

40.To meet the rising marketing 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

A: as fast as 要和前面对称，rate不和前面对称

B: 同上；their feed …
and raising 不对称

C: growing them naturally和前面不对称

D: correct

E: with … and raising 不对称

这样的比较结构不合理，及时是对称，也要补出be动词。

推荐比较的帖子：

http://forum.chasedream.com/dispbbs.asp?boardid=23&id=103101

这样一比的话表示都是supplier发出的动作,不合逻辑