求助啊！！！！！！！！！！SC里的比较题快把我整疯了！！！

zhanghanyuan

第一次发帖我也不知道格式什么的对不对，我现在对这个比较结构简直无奈，求大神解答疑惑！！
上例题：
According to recent studies comparing the nutritional value of meat from wild animals and meat from domesticated animals, wild animals have less total fat than do livestock fed on grain and more of a kind of fat they think is good for cardiac health.

A. wild animals have less total fat than do livestock fed on grain and more of a kind of fat they think is

B. wild animals have less total fat than livestock fed on grain and more of a kind of fat thought to be

C. wild animals have less total fat than that of livestock fed on grain and have more fat of a kind thought to be

D. total fat of wild animals is less than livestock fed on grain and they have more fat of a kind thought to be

E. total fat is less in wild animals than that of livestock fed on grain and more of their fat is of a kind they think is

红色即正确答案，我知道这个题大多数人是纠结B和C，好吧，我很无奈纠结的是A和B，是因为！！我之前看了这么一个例句的解析：
stresses girls experience are more likely to result in depression than are those boys experience.
在以上这个例句里，我最开始不懂为什么会有than 后面的are这个词，后来看到解析说，因为than前面是主谓宾齐全的，所以为了避免造成歧义要补出be动词表示是主语在进行比较，
那么我的问题就来了，在我发出来的这个题里，than前面的wild animals have less total fat也是主谓宾都齐全啊，那than后面为什么不需要补东西呢？
另外要问一起问一下，这个句子里traffic safety officials predict that drivers will be as likely to exceed the proposed speed limit as they are the current one，为什么要有they are呢，我真的好头疼~~！！！
附上我说的那个例句解析的链接~！http://forum.chasedream.com/thread-536547-1-1.html

zhanghanyuan

自己顶一下  大家快来救救我~~~TAT  5555  马上就要考了啊

zhanghanyuan

大家都睡了吗

zbyloveinter

Ron:

you've learned a lesson here: the gmat's preference for that 'do' is not absolute.

from a 100% strict semantic viewpoint, i agree with you here: there's technically an ambiguity. however, we now have evidence, in the form of this problem, that the gmat doesn't consider ALL of these 'ambiguities' as truly ambiguous. rather, provided that the 'second meaning' is sufficiently absurd AND nonparallel (note the obvious logical nonparallelism of compairing total fat to livestock), it's ok to eliminate the 'do'.

sigh.

remember, we don't make the rules; they do. but with each problem like this one that you study, you'll have a better idea of exactly what their rules are.

下次有问题用一下谷歌，说不定很快就能得到圆满的答案
https://www.manhattanprep.com/gmat/forums/according-to-recent-studies-comparing-the-nutritional-value-t718.html

zhanghanyuan

zbyloveinter 发表于 2015-8-16 02:32
Ron:

you've learned a lesson here: the gmat's preference for that 'do' is not absolute.

谢谢啦  帮了我很大忙呀~~~~~~~