该你了？第一次做你的题目哈。

来源: 于 2011-12-11 19:09:23 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

“Black Friday” is the most crucial day for big chain retail stores, because it is an indicator of their holiday sales for the coming month, which is usually the most profitable time of the year.