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题库 / Prep2007E1-CR-37
Capuchin monkeys in Venezuela often rub a certain type of millipede into their fur. Secretions of these millipedes have been shown to contain two chemicals that are potent mosquito repellents, and mosquitoes carry parasites that debilitate the capuchins. The rubbing behavior is rare except during the rainy season, when mosquito populations are at their peak. Therefore, the monkeys probably rub the millipedes into their fur because doing so helps protect them against mosquitoes.
Which of the following would it be most useful to determine in order to evaluate the argument?
Whether the two chemicals provide any protection for the millipedes against their own predators
Whether the type of millipede used by the capuchin monkeys in Venezuela is found in other parts of the world
Whether animals other than capuchins rub insects of any kind into their fur
Whether the only time the millipedes are readily available to the capuchins is during the rainy season
Whether secretions of any other insects accessible to the capuchins contain chemicals that repel mosquitoes
决定monkey rub 是不是因为要驱蚊，主要看是否这个行为只在雨季（蚊虫很多的时间）有。（这就是原因）。正确答案跟此非常相关，关键在于，蚊子是常年都有的，而capushins只在雨季时候出现rubbing behavior。这就是把时间做了局限，所以时间就是本题评价的对象。
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