【逻辑脑残诚恳求教】【狒狒135】之63题~

ellie78

63. Some good cooks are gourmet cooks who pride themselves on always using extravagantly rich ingredients in elaborate recipes. Some good cooks can be characterized as fast-food cooks. They may use rich ingredients as long as the recipes are easy to follow and take little time. Other good cooks are health food enthusiasts, who are concerned primarily with the nutritional value of food. But even though not all good cooks are big eaters, they all enjoy preparing and serving food.

If the information in the passage is true, which one of the following CANNOT be true?

(A) Most good cooks do not use extravagantly rich ingredients.

(B) Everyone who enjoys preparing and serving food is a good cook.

(C) More good cooks who use extravagantly rich ingredients are big eaters than are good cooks who do not use such ingredients.

(D) There are fewer good cooks who enjoy serving and preparing food than there are good cooks who are big eaters.

(E) Gourmet cooks, fast-food cooks, and cooks who are health food enthusiasts are all big eaters.

hughlv

没去看过其他的讨论，真要选的话我会选D。

这段话的前面对于各种cook的定义主要起混淆作用，关键是对最后一句话的分析：But even though not all good cooks are big eaters, they all enjoy preparing and serving food. 从这句话我们可以得出以下信息：

1. good cooks 应该是所有cooks中的一部分人
2. 只有一部分的good cooks是big eaters，甚至可能没有任何good cooks是big eater
3. 所有的good cooks都enjoy preparing and serving food

A. 可以首先排除。假设三种good cook各占1/3，那么自然这一条就可以成立了，因为有2/3都不使用extravagantly rich ingredients。
B. 虽然感觉有些荒谬，但是本题中没有提供任何信息来反驳这个观点。题目中只给出条件A可以推断出条件B，但没有信息排除条件B也可以推出条件A。所以B也排除。
C. 题中没有包含直接反驳的信息，所以C选项是完全有可能成立的。按常理也是，越喜欢寻找和使用珍贵食物材料的厨师通常也是越高级的美食家。当然我们不应该依赖于常理，这里只是打个比方。
D. 这一个论断不可能成立，原因是：good cooks who enjoy serving and preparing food 这是good cooks的绝对全集，参见上面的第3条归纳，而good cooks who are big eaters则只是good cooks的一个子集（虽然这个子集可能与全集一样大），所以这里的关系永远是大于等于，而不可能是小于。
E. 参见D的解释，big eaters子集与good cooks全集有可能重合。所以不能排除。

Mathias

这么说吧，B肯定有问题，但是它的问题在题目的背景下，不予考虑

JellyC

452272330 发表于 2013-4-15 10:54
B其实也有很大的问题，我们看这个逻辑链：all good cooks =>enjoy preparing and serving food.good cook ...

虽然反过来不一定成立但也没说反过来一定不成立，因为题目问的是cannot be true，所以B项还是有可能be true的，因此不能选B，应该选D。

452272330

hughlv 发表于 2010-2-12 12:13
没去看过其他的讨论，真要选的话我会选D。这段话的前面对于各种cook的定义主要起混淆作用，关键是对最后一 ...

B其实也有很大的问题，我们看这个逻辑链：all good cooks =>enjoy preparing and serving food.good cooks只是enjoy的一个充分条件，反过来并不成立，所以我认为B也是错的。

ellie78

谢谢LS的解答：-）

ellie78

在下觉得哪个都不对……
查过以前的帖子关于此题的讨论，也没有定论。困惑了……