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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
之前SC学不明白就是因为看了毕出的讲解，他的解题思路根本不是gmat考试要考的东西，看Ron的讲解之后才明白的登录 或 注册 后可以参加讨论
按照你这样排除你一定考不上700+登录 或 注册 后可以参加讨论
选项B：what they would normally eat扩大了语义范围，包含了老鼠所有吃的内容，从而改变了比较双方造成不可比；同时，though 表示让步，语义变成 “虽然它包含了必需的维生素和营养” ，“但是热量还是少了百分之30”，可以理解为 “维生素和营养” 其实并不重要。而 but 表示转折，“虽然热量比平时diet的热量少30%，但是它含有所有必需的维生素和营养”，逻辑更准确。
选项C：but之后是一个完整句子结构。导致 contains 与 live up 并列转折；逻辑上应该是contains 与 has 并列，表示转折；看不出来也没关系，马上看到选项D 就知道选项C 的错误了。
选项D：正确
选项E：与选项B 同理，though 表示让步关系，表达不准确。
a diet (that has at least 30 percent fewer calories than they would normally eat) but (that otherwise contains all necessary vitamins and nutrients).
后面的两个(that...)都是做的a diet的形容词从句，修饰这个diet：虽然比它们平时吃的少了30%的卡路里，但是含有所有必须的维生素和营养物质。
30 percent fewer calories than (the calories that) they would normally eat，fewer后面跟的是calories，所以比较的对象是calories，而不是diet。
两个（that...)是并列的关系，要用并列连词but来连接，没有从属的意思，不用though。
考察：
平行（没看出来），未画线部分
看到but应该想到平行，不要只看到and才想平行，otherwise 另外； that。。but that 。。
that has at least 30 percent fewer calories than they would normally eat but that otherwise
前中：fewer than考比较
后：but that考平行，这一点没有看出来，第一个that后面内容太长了干扰了后面but that平行的识别。以后看到but/and还是多个心眼，不管前面句子多长
去繁（than they would normally eat ）从简（that has fewer calories but that。。），抽出句子主干
a diet with normally followed by tools：a diet with spoon
请问，A，E选项中的 that which they would normally eat、B选项中的what they would normally eat，
分别与 a diet that they would normally eat 有什么不同呢？
关键是，在than的后面，不是that they would normally eat，而是they would normally eat。
未能解惑。- 比较对象是【少30%卡的diet】和【平时吃的diet】，【they would normally eat】的核心词是eat，diet 怎么能和 eat 进行比较呢？
-【a diet that they would normally eat】【that which they would normally eat】【what they would normally eat】三个用法的不同之处在哪里呢？
最合理的比较行为或许是diet，但也可以比较“正常吃”这个行为啊，因为这个行为本身就对应了diet。这就类似于，I eat more apples than you do一样，最合理的比较对象肯定是苹果数量，但我也可以认为是吃这个行为的发生次数呀。
恩，明白了，diet 和 they would normally eat 可以比较。那么 diet 和 A、B、E选项中的 【that which they would normally eat】、【what they would normally eat 】为什么不能比较呢？
比较的不是diet，而是卡路里的含量。
老师在解析中也说了具有fewer calories than关系的两者应该是a diet和a diet that they would normally eat，所以比较的对象应该是diet才对啊。。。
同问
个人感觉可以先通过语义排除B和E（不能用though而是要用but），然后再用but平行排除A和C。登录 或 注册 后可以参加讨论
Laboratory rats and mice live up to 40 percent longer than usual
when fed a diet 【that 从句 has at least 30 percent fewer calories than they would normally eat】 but 【that从句 otherwise contains all necessary vitamins and nutrients.】
实验室大鼠和小鼠在喂食【热量比正常情况下至少少 30%】但【却 含有所有必需的维生素和营养物质】的饮食时，寿命比平时长 40%。
B选项with应该要接名词，不能接整个句子
C选项 fewer后面没有than
D选项正确，此时两个that可以平行，而且先行词都是diet，修饰正确
E选项though是让步状语（虽然），意思和but不一样，题目说的是这个diet卡路里比较少但是包含了全部重要的营养物质，所以要用but而非though
句意：虽然少30%的卡路里，但是拥有必要的维他命和营养！（如果用后面用though，逻辑关系就彻底错了）
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，（省略，对比... than "in" xx or 1980s）
though 做让步状语修饰动词，but为连词连接2个句子登录 或 注册 后可以参加讨论
不是，因为你看正确选项也有but和otherwise一起用呢！我自己的想法哈哈哈~登录 或 注册 后可以参加讨论
though引导让步状语从句，修饰主句动词，has
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
and，but连接两个独立的句子。🌟
看到and, but要注意后面的成分要与前面的平行。🌟🌟
考察：
平行（没看出来），未画线部分
看到but应该想到平行，不要只看到and才想平行，otherwise 另外； that。。but that 。。
that has at least 30 percent fewer calories than they would normally eat but that otherwise
前中：fewer than考比较
后：but that考平行，这一点没有看出来，第一个that后面内容太长了干扰了后面but that平行的识别。以后看到but/and还是多个心眼，不管前面句子多长
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