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.（A）
(E) Since 1987, sales of vacuum cleaners have risen twenty percent.
我不懂A 為什麼是對 的 我認為prior to 1987 跟本題 應該沒有關係
20. A light bulb company produces 2,000 light bulbs per week. The manager wants to ensure that standards of quality remain constant from week to week. The manager, therefore, claims that out of 2,000 light bulbs produced per week, 500 light bulbs are rejected.
Of the following, the best criticism of the manager’s plan is that the plan assumes that
(A) light bulb manufacturers cannot accept all light bulbs that produced
(B) the overall quality of the light bulbs would not be improved if the total number of light bulbs produced were reduced
(C) each light bulb that is reviewed is worthy of being reviewed
(D) it is difficult to judge the quality of a light bulb（E）
(E) the 1,500 light bulbs that are accepted will be of the same quality from week to week
我不懂這一題 我是選C 題目不是要我們選 對plan 有削弱 的答案嗎 我看不出 E有什麼作用耶 可不可以幫幫我 解釋一下這一題 謝謝
18A说的是那些不用seminar的公司本来的业绩就好，所以说seminar本身不好就站不住脚了。
20E取非，即剩下的1500个bulb的质量并不一定是恒定的，也就削弱了manager's plan, 即要保证生产出来的bulb的质量水平恒定。
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