大全TEST 2001年6月 section II-23

23.   To be horrific, a monster must be threatening. Whether or not it presents psychological, moral, or social dangers, or triggers enduring infantile fears, if a monster is physically dangerous then it is threatening. In fact, even a physically benign monster is horrific if it inspires revulsion.

Which one of the following logically follows from the statements above?

(A) Any horror-story monster that is threatening is also horrific.

(B) A monster that is psychologically dangerous, but that does not inspire revulsion, is not horrific.

(C) If a monster triggers infantile fears but is not physically dangerous, then it is not horrific.

(D) If a monster is both horrific and psychologically threatening, then it does not inspire revulsion.（E）

(E) All monsters that are not physically dangerous, but that are psychologically dangerous and inspire revulsion, are threatening.

请问这样的问题怎样快速解题?, 我每个选项都得推理一下, 一会就把我的脑子转晕了

从原文得到的推倒：

horrific-->threatening,  physically dangerous --> threatening,  inspires revulsion-->horrific

也就是：physically dangerous --> threatening；inspires revulsion-->horrific-->threatening。得出E。

根据原命题等价与逆否命题，逆命题等价于否命题。其它命题关系不成立排除其它选项。

这是LSAT题，逻辑关系比较多。难度高于GMAT。

1。 列出原文逻辑关系：horrific--->threatening, physically dangerous---->horrific, inspire revulsion--->horrific

2。将选项和原文逻辑关系对：否命题和逆命题都错。只有逆否命题和原命题对。同时排除不参与逻辑关系的选项

3。A：threatening ---> horrific 逆命题。错

     B：psychologically dangerous不参与逻辑关系，不管。does not inspire revulsion--->not horrific否命题。错

    C：triggers infantile fears 不参与逻辑关系。不管。not physically dangerous----> not horrific.否命题。错

    D：原文没此逻辑关系。

   E：psychologically dangerous and inspire revulsion是inspire revulsion的子概念。原文的inspire revulsion--->horrific--->threatening.则E也对。

两位的回贴内容太棒了, 说的非常清晰,教会了我一类题的分析方法.严重感谢!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

献花!