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

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”