FeiFei-63，请大家帮忙了

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.

为什么B不是答案？

因为 正如 球是圆的，不能推出 所有圆的东西都是球啊

所以原文结论是 所有好的cook enjoy preparing and serving food，并不能推出  enjoy preparing and serving food的人就是 好的cook啊

But even though not all good cooks are big eaters, they all enjoy preparing and serving food.

即使不是所有的好廚師都是big eaters, 但他們全都enjoy preparing and serving food.

Therefore, ALL good cooks enjoy prpearing and serving > good cooks who are also big eaters

(B)必錯

楼主， 这题以前讨论过。 是LSAT 里面的，建议你用逻辑大全word 版找到lsat 相应的标号。 然后搜索一下以前的讨论。

我觉得你的问题可能是：

问题问的是： cannot be true, not may not be true.  

pay attention to the difference.  

Agree with Bryony. B might and might not be true. "Cannot" means it is impossible for B to be true. From the information contained in the argument, we cannot conclude whether B might be true or not. Another example:

All the best players come to this tournament. Therefore every player in the tournament is one of the best players. Without additional information, we cannot definitely conclude whether the assertion is correct or not.

E为什么不对呢？

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

从原文已知“not all good cooks are big eaters”， Good Gourmet cooks, Good fast-food cooks, and Good cooks who are health food enthusiasts 是E里相应概念的子集，如果子集are not all big eaters, 那么全集也一定are not all big eaters. 所以E一定是can not be true.

请NN指点。