Comcorp Shipping Clerk: Last week, no shipments of building supplies were sent out on Friday. The five specially ordered shipments sent out last week were sent out on Thursday, and each of those specially ordered shipments consisted entirely of building supplies. Four shipments were sent to Truax Construction last week, none of which consisted of building supplies.
If the shipping clerk's statements are true, which of the following must also be true?
All of Comcorp's shipments of building supplies last week were specially ordered.
None of Comcorp's shipments sent on Friday of last week was sent to Truax Construction.
None of the shipments sent by Comcorp to Truax Construction last week was specially ordered.
None of Comcorp's shipments sent on Thursday of last week was sent to Truax Construction.
All of Comcorp's shipments of building supplies last week were sent out on Thursday.
情景:上周,没有建筑用品的货物是在周五被发货的。周四有五个特殊定制的货物被发出,每一个都全部由建筑用品组成。四个货物上周被寄送给了Truax,没有一个是建筑用品。
推理:本题由于没有结论,属于必然性推理。
选题方式:略。
选项分析:
A选项:所有上周的Comcrop的建筑用品货物都是特殊定制的。文段中说周四有五个特殊定制的货物被发出,并没有说所有上周的货物都是特殊定制的。
B选项:没有任何一个Comcrop在周五的货物是给Truax的。周五Comcorp没有发过关于建筑用品的货物,Truax也没有收到关于建筑用品的货物,所以我们无从确定Truax是否收到了周五发出的东西。
C选项: Correct. 没有一个Truax收到的来自Comcorp的货物是特殊定制的。五个特殊定制的货物都是在周四发出的,且都是建筑用品。但是,Truax没有收到任何建筑用品,所以,这些特殊定制的货物都不是发给Truax的。
D选项:没有一个在周四发出的Comcrop的货物是发往Truax的。文中只说了五个特殊定制的货物是周四发出的,且它们都是建筑用品,并没有说过所有周四发出的货物都是关于建筑用品的,所以我们不能确定周四是否有发给Truax的货物。
E选项:所有Comcrop的建筑用品货物都是周四发出的。文中只说周四发出了建筑用品货物,没有提及是否所有的建筑用品货物都是周四发出的。
这种题目就按照逆否命题选出正确答案就好,从题干入手,根据“周四有五个特殊定制的货物被发出,每一个都全部由建筑用品组成的”逆否命题为“不是建筑用品,就不是特殊定制”,直接就可以因为T地的都不是建筑用品,所以不是特殊定制,也就是对应的C选项:所有的T地的都不是特殊定制。但其实题目可以更严谨一点。
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