-Ⅰ-18. Critics of sales seminars run by outside consultants point out that since 1987, revenues of vacuum cleaner companies whose employees attended consultant-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, if 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 their ineffectiveness.
(E) Since 1987, sales of vacuum cleaners have risen twenty percent.
答案是A。它说的是Sales，而文中关注的revenue。我觉得sales和revenue含义相差太大了，一家公司sales增加了，不能表示revenue会增加呀？NN能帮我理解为什么A是正确的吗？
-Ⅰ-18. Critics of sales seminars run by outside consultants point out that since 1987, revenues of vacuum cleaner companies whose employees attended consultant-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, if 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 their ineffectiveness.
(E) Since 1987, sales of vacuum cleaners have risen twenty percent.
答案是A。它说的是Sales，而文中关注的revenue。我觉得sales和revenue含义相差太大了，一家公司sales增加了，不能表示revenue会增加呀？NN能帮我理解为什么A是正确的吗？
文中提到了这些critics本来就是针对sales seminars run by outside consultants. 而且A选项中的sales是销售额的意思，对于一个卖真空吸尘器的公司（不是真空吸尘器厂）来说revenue即使不等于销售额也至少是成正比的。
所以没有必要钻这个牛角尖，A没有问题。而且这题B,C,D,E都是明显削弱项。
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