OG上一道有关比较的题！求大家看看！

跆拳九段31

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

正确答案是B，楼主有关这道题其他疑问没有，也很认同正确答案是B，只想针对各选项的比较的部分讨论一下，看看理解是否正确。求大家指正，并对C中比较略有疑问。

以下是我的一点理解：

AB从比较角度实质一样，只是B中将do省略了。do在这里是用助动词代替了have。
还原比较：wild animals have less total fat than livestock have total fat（因为后面有其他修饰，所以简化为do并放到livestock前面）

C中我对OG中的解释不太明白，OG中说：”that fail to refer back to anything"这里的fail是指that指代的不合逻辑吗？还是说就是不能指代？？
我个人理解这里that从结构上指代total fat，原句变为：
wild animals have less total fat than total fat that livestock have;汉译：野生动物有脂肪，它也有家畜的脂肪（只是它的脂肪少），所以不合逻辑，它只有自己的脂肪，没有家畜的脂肪。
所以OG中说的fail torefer back to anything是这个意思吗？

D中比较很明显不对应。

E中从逻辑上比较事物对等，但是结构不对称。

求大家解答C并指正。谢谢！

跆拳九段31

自己顶一下！希望大牛来解答，真的好想彻底搞懂有关比较的东西！谢谢！

跆拳九段31

求人解答

adsdsd

先贴一段大神RON的解答：

mclaren7 wrote:--> My understanding is that when we compare items, we should say "Protein in rice is of higher quality than that in wheat". Thus would like to check why is "that of" in option C wrong?

RON：when you see a comparison, you need to boil the comparison down to the SINGLE NOUNS/PRONOUNS that are compared.  this means, inter alia, that you have to dispense with modifiers, prepositional phrases, and the like - the same irrelevant constructions that go out the window when you consider other types of agreement (like subject-verb agreement).

in the example you've cited, the comparison is between PROTEIN ('in rice' is a modifying prepositional phrase, so it gets chucked) and THAT (which of course refers to protein), and is therefore proper.

in q24 choice c, the comparison is between ANIMALS and THAT (which in this case stands for FAT).  you can't consider livestock to be the second half of the comparison, because it's part of a prepositional phrase (which is a modifier and therefore can't be part of the comparison).

我理解的是that指代total fat的话，animal和fat比较不合适，请指教。