求教一道逻辑题

lorilixin · 发表于 2012-4-18 19:13:34

复习logic的时候偶遇此题，但就是想不通答案为啥正确，求各位牛人解救，小弟感激不尽，闲话不多说，直接上题~
In the United States, vacationers account for more than half ofall visitors to what are technically called pure aquariums but for fewer thanone quarter of all visitors to zoos, which usually include a zoo aquarium ofrelatively modest scope.
Which of the following, if true, most helps to account for thedifference described above between visitors to zoos and visitors to pureaquariums?

(A) In cities that have both a zoo and a pure aquarium, localresidents are twice as likely to visit the aquarium as they are to visit thezoo.
(B) Virtually all large metropolitan areas have zoos, whereas onlya few large metropolitan areas have pure aquariums.
(C) Over the last ten years, newly constructed pure aquariums haveoutnumbered newly established zoos by a factor of two to one.
(D) People who visit a zoo in a given year are two times morelikely to visit a pure aquarium that year than are people who do not visit azoo.
(E) The zoo aquariums of zoos that are in the same city as a pureaquarium tend to be smaller than the aquariums of zoos that have no pureaquarium nearby.
The correct answer is B.
Why?

求教一道逻辑题

所属分类: GMAT考试

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