Advertisement: Ten years ago, the Cormond Hotel's lobby was carpeted with Duratex carpet while the lobby of a nearby hotel was being carpeted with our competitor's most durable carpet. Today, after a decade in which the two hotels have had similar amounts of foot traffic through their lobbies, that other hotel is having to replace the worn-out carpeting near its lobby entrances, whereas the Cormond's Duratex carpeting has years of wear left in it.

Which of the following, if true, most seriously weakens the force of the advertisement's evidence for concluding that Duratex carpet is more durable than the carpet of its competitor?


The lobby of the Cormond Hotel has five different entrances, but the lobby of the other hotel has only two.

The carpet of the Cormond Hotel's lobby is not the most durable carpet that Duratex manufactures.

The other hotel has a popular restaurant that can be reached from outside without walking through the hotel lobby.

The carpet that is being used to replace carpeting near the other hotel's lobby entrances is not Duratex carpet.

There is a third hotel near the other two that has not replaced the Duratex carpet in its lobby for more than 15 years.

考题讲解

情景:Duratex最耐用!证据表明,Cormond Hotel自从铺了Duratex地毯之后,10年没坏;邻近的差不多的酒店铺了别的牌子的地毯,已经坏了。因此,Duratex是最棒的。

推理:

前提:Cormond Hotel自从铺了Duratex地毯之后,10年没坏;邻近的差不多的酒店铺了别的牌子的地毯,已经坏了。

结论:Duratex的地毯比它的竞争对手更耐用。


答案预估:

其它能解释为何“Duratex地毯用了10年没坏”的原因。
“Duratex的地毯比它的竞争对手更耐用的”其它必要条件(常理上能保真推理出的一切结果)不存在。



选项分析:

A选项:Correct. Cormond Hotel的大厅有五个门,但是其它的Hotel的大厅有两个门。铺了Duratex地毯的酒店门数更多,意味着在客流量一样的情况下,每个门平均的踩踏量更小,可以解释为何“Duratex地毯用了10年没坏”。

B选项:Cormond Hotel的大厅所铺设的地板并不是Duratex制造的最耐用的地板。不是最耐用的,更能证明Duratex地毯耐用。但即便如此,也和本题的推理过程无关。(更何况这道题目问的是削弱)


C选项:Other Hotel有一个可以不从大厅走就能到达的很受欢迎的餐厅。本选项和地毯耐用与否都没关。


D选项:Other Hotel想要置换的地毯不是Duratex制造的地毯。本选项和答案预估方向完全没关。

E选项:
另外一家Hotel用了Duratex的地毯十五年未坏。本选项是“Duratex的地毯比它的竞争对手更耐用”的另一个必要条件(即,无论在哪里,都10年以上不坏),可以加强推理。

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