大白皮上的逻辑

doris

225.In the United States,vacationers account for more than half of all visitors to what are technically called "pure aquariums" but for fewer than one quarter of all visitors to zoos, which usually include a "zoo aquarium" of relatively most scope.
WHich of the following ,if true, most help to account for the difference described above between visitors to zoos and visitors to pure aquariums?
答案为B：Virtually all large metropolitan areas have zoos,whereas only a few large metropolitan areas have pure aquariums.

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 ,if true ,is the most effective challenge to the critics of sales seminars?
答案为A:Those vacuum cleaner companies whose sales were highest prior to 1987 are the only companies that did not send employees to the seminars.

请各位高人给予指点！

doris

呵呵，谢谢大家了，虽然不是特别明白，但是好象有点小懂了

primefang

225 题被认为是GMAT最难的"现象解释题"

marine91

1。 因为很多大城市里面都有zoo aquarium, 大家出去度假（vocationer）时当然不会再去那儿, 而因为只有少数大城市里面有pure aquarium,所以大家度假时还可以去去的。
２。　因果颠倒了，题干中，由attnding seminar 推low revenues.A中直接以only low revenues attend seminar来说明原来的因果关系不成立。