请教一题 没讨论到的答案选项 FEIFEI 63

ken92

FEIFEI

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.
            

答案是D   我同意~~

但是想问B

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

但B的意思
                感觉不就是在
                反推
                吗??
                    

A-> B 不等于
                B->A 阿??

所以也可能是不对的答案阿?? 请教
                谢谢

mingmingyy

偶选的是B...........

 good cooks enjoy preparing and serving food.
                

但B,
                    Everyone who enjoys preparing and serving food is a good cook 并不能由原文的话推出啊?~~

qianrene

这里问的是cannot be true就是说从文中一定推得出是错误的，而B是可能错误（B也有可能是对的哦）

flyrabbitfei

恩，同意楼上的意见。

ken92

哈哈
            真的假的阿?? 所以我讲的B 他也可能是错的啰?? 原因是因为他返推论了
            对吗??
                 

说到这  请问  我看到很多人说
            逆否命题
            什么意思阿?? 就是像这样
            反推论吗?? 那又有看到
            逆命题
            ??  奇怪
            逆否命题
            跟逆命题
            还有这题的B 是什么关西呢??
            

zacharyzhang

搞清楚“一定不”和“不一定”就行了。

让你找“一定不”的，不要拿出“不一定”的，管他什么命题方式呢。