FEIFEI逻辑，不懂啊，觉得很多都推不出来

wynyy2000

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.
我选的是B，文中说的all good cooks enjoy preparing and serving food.但B选项是个逆命题，当然不成立,求解！！！
正确答案是D，我也理解D选项与文中结论刚好相反，good cooks who enjoy preparing and serving food 肯定要比good cooks who r big eaters 多

sdcar2010

逆命题，当然不成立? No. It is possible to 成立.  For example, if ONLY good cooks enjoy preparing and serving food, then B is right. There is no statement in the stimulus which removes this possibility. So B COULD be true.

wynyy2000

那就说，由上文可能推出，也可能推不出B，好吧，我勉强懂了。。。。。