Mindfree大侠说了E为什么错,我说说A为什么对:由于现在没有实行blood-control的地区都是,且仅是那些80年前没有blood damage的地区,所以说现在实行blood-control的地区以前就有blood-damage,也就是说他们基础本来就比那些没有实行的差,现在即使开始实行blood control了,也不能一下子赶上。所以WEAKEN了题目 下面这倒题和楼主出的题有异曲同工之妙。逻辑思路和出题套路都是一样的,我想大家弄明白一个,再遇到这类题就不怕了。 (XDF补充244) Critics of sales seminars run by outside consultants point out that since 1987,revenues of vacuum cleaner companies whose employees attended consult ant-led seminars were lower than revenues of vacuum cleaner companies whose employees did not attend such seminars. The critics charge that for vacuum cleaner companies, the sales seminars are ill conceived and a waste of money.Which of the following,fi true,is the most effective challenge to the critics of sales seminars? A).Those vacuum cleaner companies whose sales were highest prior to 1987 are the only companies that did not send employees to the seminars. B).Vacuum cleaner companies that have sent employees to sales seminars since 1987 experienced a greater drop in sales than they had prior to 1987. C). The cost of vacuum cleaner sales seminars run by outside consultants has risen dramatically since 1987. D). The poor design of vacuum cleaner sales seminars is not the only reason for the ineffectiveness. E).Since 1987,sales of vacuum clearners have risen twenty percent. Answer:A
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