[求助]再问gwd-3-20 ，请指教

camuszhu

Q20:

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?

A;At least one of the shipments sent to Truax Construction last week was specially ordered.
B:At least one of last week’s specially ordered shipments did not consist of building supplies.
C:At least one of the ship

camuszhu

ments sent to Truax Construction was not sent out on Thursday of last week.
D:At least one of the shipments that were sent out on Friday of last week was sent to Truax Construction.
E:At least one of the shipments sent to Truax Construction last week was sent out before Friday.
我查了以前的解释，但是还是不明白A、B和E的说法有什么不同，请指教！

camuszhu

帮偶看看吧，谢谢！

usdream

答案是B 吧。

camuszhu

xiexie usdream MM!

da xia help!

lawyer_1

A。错。原文看不出Four shipments to Truax Construction last week 和第一句的 five specially ordered shipments 有何关系。错

B。错。因为不知道上周四的SHIPMENT中是否包括SUPPLIES，只知道周五的都有。故不知T周四送出的 five specially ordered shipments 是否有SUPPLIES。

C。错。周四送多少去Truax Construction ，或有没有送，原文不知道。

D。错。原文只知道去Truax Construction 有四个，至于何时送，不知道。尽管原文说这四个中，有三个有SUPPLIES，而周五送的都有SUPPLIES，但不知其他时间送的是否也有SUPPLIES，所以不知这三个是否都是周五送。

E。对。周五的都有SUPPLIES，以后就关门了，所以没有SUPPLIES的肯定是周五前送的。即去Truax Construction 中肯定有一个是周五前送的。又因为可能周五前的其他时间送的也包括SUPPLIES，即另外的三个也可能是周五前送的，所以E用“AT LEAST ONE”

camuszhu

xiexie lawyer_1 gg

ricedog

看了lawyer_1的解释就明白了，但是自己做题的时候就很糊涂，很难清楚的理清思路，能请教一下lawyer_1是怎么分析问题的么？

skyguard2000

我觉得这种题目：“If somebody’s statements are true, which of the following must also be true?”就是求somebody's statements的必要条件。

就按照Assumption题目的作法做。选项取非，看原Statement是否一定不成立。

A取非：所有去TC公司的shipments都不是specially ordered的，原statement可能成立。

B取非：所有的SO（specially ordered）都是BS（building supplies），原statement可能成立。

C取非：去TC公司的都Thursday走，原statement可能成立。

D取非：Friday走的都不去TC公司，原statement可能成立。

E取非：去TC公司的都Friday走，原statement一定不成立。

如果跟着题目的意思绕，要求脑子特别清醒，也会花很多时间。

skyguard2000

补充一句，如果题目再多加几个干扰条件，那就更绕不清楚了，所以在这种情况下不能跟着题目顺序思考。