单选题 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 modest scope.
Which of the following, if true, most helps to account for the difference described above between visitors to zoos and visitors to pure aquariums?

A、 In cities that have both a zoo and a pure aquarium, local residents are twice as likely to visit the aquarium as they are to visit the zoo.
B、 Virtually all large metropolitan areas have zoos, whereas only a few large metropolitan areas have pure aquariums.
C、 Over the last ten years, newly constructed pure aquariums have outnumbered newly established zoos by a factor of two to one.
D、 People who visit a zoo in a given year are two times more likely to visit a pure aquarium that year than are people who do not visit a zoo.
E、 (E) The zoo aquariums of zoos that are in the same city as a pure aquarium tend to be smaller than the aquariums of zoos that have no pure aquarium nearby.

【正确答案】 B

【答案解析】[解析] 本题为解释差异，要抓住双方关键词及差异点数字来定位选项。(B)中涉及双方关键词“zoos”与“pure aquariums”，且又有数字“all”与“only a few”，且也能起到解释作用，所以(B)正确；(A)中讨论的是local residents，而段落中讨论的是“Vacationers”，因此(A)为无关选项；(C)中的“over the last ten years”为特指，但段落中为泛指，所以也不正确；(D)、(E)的比较对象压根就不对。