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题库 / GMATLA-SC-107
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.
wild animals have less total fat than do livestock fed on grain and more of a kind of fat they think is
wild animals have less total fat than livestock fed on grain and more of a kind of fat thought to be
wild animals have less total fat than that of livestock fed on grain and have more fat of a kind thought to be
total fat of wild animals is less than livestock fed on grain and they have more fat of a kind thought to be
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
题目分析：
略
选项分析：
A选项：代词they没有指代对象。
B选项：Correct. 本选项在逻辑和语法上均是正确的。
C选项：fat of a kind需改为a kind of fat。a kind of是一个固定搭配，表示某一种，不能拆分。of a kind表示“同一类，相似的”，显然不符合本题的含义。另外，这里的that of略有赘余的嫌疑，虽然可以比较两种动物的脂肪，但比较两种动物已经足够清楚，所以这个that of可以不必要添加。
D选项：比较对象不对等，应该比较的是野生动物和家养动物。fat of a kind需改为a kind of fat错误同选项(C)。
E选项：代词they的指代错误同(A)。fat is of a kind错误原理同选项(C)。
提出几个新角度，抛砖引玉：
先说C：C争议比较大，问题集中在that of livestock上。that只能指代total fat，那么这样的话，就是拿[total fat] than [total fat of livestock]，这样是没有可比性的。有人说是wild animals的total fat和livestock的total fat比较，但是回到原句，wild animals have total fact和total fact of livestock结构不一样，表达的意思是不一样的。我不是出题的，也没看过所有GMAT题，但是[than that of]的结构前面一定有A‘s B或者A of B，GMAT应该是认可这两个所有格结构比较，而不是A have B（请帮找反例）。
C的另一个问题在于thought to be修饰的是a kind错误，应该修饰fat。
OG17-sc758: prices at the producer level are only 1.3 percent higher now than those of a year ago and are going down.... 在这里than后面就用了those of的句型，而前面并没有你所说的对应，这怎么解释呢？
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