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题库 / Prep2012-SC-69
Laboratory rats and mice live up to 40 percent longer than usual when fed a diet of at least 30 percent fewer calories than that which they would normally eat, but that otherwise contains all necessary vitamins and nutrients.
of at least 30 percent fewer calories than that which they would normally eat, but that otherwise
with at least 30 percent fewer calories than what they would normally eat though otherwise it
that has at least 30 percent fewer of the calories that they would normally eat, but otherwise it
that has at least 30 percent fewer calories than they would normally eat but that otherwise
that has at least 30 percent fewer calories than that which they would normally eat, though that otherwise
题目分析：
首先，具有fewer calories than关系的两者应该是a diet和a diet that they would normally eat，所以than后需要写出比较的对象（时态或情态等任何的不同均不能省略），即they would normally eat，可以排除(A)(B)(E)。其次，在本题中，具有转折关系的两者是“卡路里比以前吃的饭少了30%（at least 30 percent fewer calories than they would normally）”和“所有的营养以及维他命是一样的（contains all necessary vitamins and nutrients）”，即，这个diet中，虽然某些“坏东西”少了，但是“好东西”没有什么变化，因此has at least 30 percent应该和contains all necessary vitamins and nutrients平行，可以排除(C)，答案为(D)。
选项分析：
略
D
比较中省略的原则在于是否会造成歧义。如果省略能使比较更清晰就省略；如果省略会带来比较上的歧义，则不能省略。省略的一定不是比较的重点，省略是为了更好地突出比较的重点。
D，rats was fed a diet that has at least 30 percent fewer calories than they would normally eat
这里被比较部分省略了定语或比较的主体diet，than (the diet) they would normally eat，但不会引起歧义。
另一个例子：Rice has protein of higher quality than that in wheat.
That不能省略，因为比较的是 protein in rice VS protein in wheat,不是rice VS wheat
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