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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
老师，这个题目的出发点，到底是从你语音讲解的成分出发呢？还是从文字解释中的比较级出发？
如果从语音中的成分出发：
A选项中，but连接了前后2个定语，都修饰a diet，而且并列连词but并没有要求前后的成分，语法和形式上完全平行啊，所以of 和
that定语从句并列为什么错了呢？
如果从比较级出发：
这个题目应该比较的是diet呢？还是diet里面所含的卡路里呢？还是能等同于“吃”这个行为？不同的内容，比较的形式不同啊，感觉看这个选项的比较级要晕了。
针对于D选项，就算可以等同于“吃”这个行为，那么than的左边没有平行对称的结构啊“they would normally eat”,than的左边，就算补全了也是they are fed a diet that ......
我看过你写的那本语法书的比较级方法了，但是到实际做题，不会那么死的，灵活度太大了，感觉比较级的题目一直错下去啊。。。
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