Question

GMAT 逻辑题求解

Capuchinmonkeys in Vanakula often rub a certain type of millipede into their fur. Secretions of these millipedes have beenshown to contain two chemicals that are potent mosquito repellents, andmosquitoes carry parasites that debilitate the capuchins. The rubbing behavior is rare except duringthe rainy season, when mosquito populations are at their peak. Therefore, the monkeys probably rub themillipedes into their fur since doing so helps protect them against mosquitoes.

Which of thefollowing would it be most useful to determine in order to evaluate theargument?

(A) Whetherthe two chemicals provide any protection for the millipedes against their ownpredators
(B) Whetherthe type of millipede used by the capuchin monkeys in Vanakula is found inother parts of the world
(C) Whetheranimals other than capuchins rub insects of any kind into their fur
(D) Whether the only time the millipedes arereadily available to the capuchins is during the rainy season
(E) Whethersecretions of any other insects accessible to the capuchins contain chemicalsthat repel mosquitoes
为什么答案选D 求详解....

Answer 1

Manhattan论坛关于这题的讨论，Ron大神已经很详细的说明啦~

http://www.manhattangmat.com/forums/capuchin-monkeys-in-venezula-t2028.html

这题的点在猴子rub的行动是因为rain season 还是因为要用milipedes防虫。

D答案 是不是只有在雨季的时候millipedes对猴子才能用。
是，猴子使用M可能是因为别的原因，和蚊子没有直接联系。
不是，一年四季都可以用millipedes但是却在雨季蚊子最多的时候才用，所以结论，猴子用millipedes rub毛防虫成立。