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

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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：

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