GWD3-Q20 急切盼望大牛指点

scientist

GWD3-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?B 

    

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 shipments 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.

盼望大牛指点，怎么也想不明白的说啊~~~~~~~~~~~

necroosu

作这道题的时候，说实话没想那么多看了E就选了，回头仔细看看，确实比较费劲。。。

细看后的思路如下，欢迎讨论。

1. 题目中Thursday和Friday和Weekend其实都是陷阱，为了让我们产生Shipments can only be sent out on Thr and Fri, not any other day during the week的错误assumption.

2. 有了以上的觉悟，此题就好懂了点：

A.      At least one of the shipments sent to Truax Construction last week was specially ordered. 可以是对的，但不是在任何时候都对的（i.e. 周一至三的，而且也没说周一至三的东西到底是什么）

B.      At least one of last week’s specially ordered shipments did not consist of building supplies. 题目没有涉及specially ordered shipments和building supplies直接论据，也是可对可错

C.      At least one of the shipments sent to Truax Construction was not sent out on Thursday of last week. 这里有点悬，也是可对可错，因为题目没有排除Thursday也可以send out building material.

D.      At least one of the shipments that were sent out on Friday of last week was sent to Truax Construction. 一样，可对可错，即使没有星期五的，也保不齐是前几天送的。

E.       At least one of the shipments sent to Truax Construction last week was sent out before Friday. 这个就是对的啦，因为题目明确说了，甭管咋滴，只要是星期五的都是building material，现在有一个不是，而且周末也不能发，所以永远成立。

necroosu

补上一句，我觉得Must be true的题，是最难的，Boldface的都比来的直接。。。

scientist

大彻大悟大彻大悟，感激不尽感激不尽

海的遐想

顶~~~望XDJM指点呀！

海的遐想

http://forum.chasedream.com/dispbbs.asp?BoardID=24&ID=344986&replyID=&skin=1刚找到一个帖子，去看看吧

记忆钢琴

完全同意  归纳题最难！！