作文：
The following appeared in a memorandum to a team developing accounting software for SmartProSoftware, Inc.:
"Currently, more professional accountants use SmartPro accounting software than any other brand.However, in the market for personal accounting software for non-professionals to use in preparing theirincome tax returns, many of our competitors are outselling us. In surveys, our professional customersrepeatedly say that they have chosen SmartPro Software because our most sophisticated softwareproducts include more advanced special features than competing brands. Therefore, the most effectiveway for us to increase sales of our personal accounting software for home users would clearly be to addthe advanced special features that our professional software products currently offer."
IR：
1、有一道题很有意思。大意是说，有一个清洁公司给三家公司即a、b、c公司做清洁，a公司在星期一、四、五清洁；b公司在星期二、三、五清洁；c公司在星期一、三、五清洁；如图（图是我自己画的考试的时候没有啊……）
[attach]183721[/attach]
选项有五个，请在这五个选项中选择一定对的（must be true）和一定错的（must be false）；
我选择的一定对的：从三个公司中选择，如果选出来的公司会有连续两天时间不清洁，那么这个公司一定是a。（因为星期二、三的时候a都没有清洁）
我选择的一定错的：在三个公司中选择，如果选出来的公司是在星期四清洁，那么这个公司也会在星期三清洁。（因为只有a在星期四清洁，但是a不可能在星期三清洁）