这道题不会做

deezy

Shipping Clerk:  The five specially ordered shipments sent out last week were sent out on Thursday.  Last week, all of the shipments that were sent out on Friday consisted entirely of building supplies, and the shipping department then closed for the weekend.  Four shipments were sent to Truax Construction last week, only three of which consisted of building supplies.

 

If the shipping clerk’s statements are true, which of the following must also be true?

 

1. At least one of the shipments sent to Truax Construction last week was specially ordered.
2. At least one of last week’s specially ordered shipments did not consist of building supplies.
3. At least one of the shipments sent to Truax Construction was not sent out on Thursday of last week.
4. At least one of the shipments that were sent out on Friday of last week was sent to Truax Construction.
5. At least one of the shipments sent to Truax Construction last week was sent out before Friday.

答案是E，晕啊

愁予

条件一：上周的特别订制的货都是周四发出的

条件二：上周五发出的货都是建筑材料，并且周末不发货。

条件三：上周发往T的活只有三个包含建筑材料。

我们发现二和三是有交集的，就是“建筑材料”。这也是答题的关键

A说发往T的货至少有一个特别订制的。也就是要一和三有关系。错

B说上周的特别订制的货至少有一个是建筑材料。要一和二有关系。错

C说上周发往T的货至少有一个不是在周四发出。要一和三有关系。T的货和特别订制没有关系。错

D说上周五发出的货至少有一个是发给T的。二和三，但是“周五发出的货都是建筑材料”不代表他的逆命题也成立也就是建筑材料不一定都在周五发出，T的货也有可能都不是周五发出的。

E说上周五发往T的货至少有一个是在周五前发出的。由于周五发出的都是建筑材料而发往的货有三个是建筑材料（隐含有的货不是建筑材料）。正确

deezy

真是超级复杂啊，谢过先

Mayanist

啊，有这种题？学习一遍，谢谢！

考试中这类题多见吗？