Capuchin monkeys often rub their bodies with a certain type of millipede. Laboratory tests show that secretions from the bodies of these millipedes are rich in two chemicals that are potent mosquito repellents, and mosquitoes carry parasites that debilitate capuchins. Some scientists hypothesize that the monkeys rub their bodies with the millipedes because doing so helps protect them from mosquitoes.

Which of the following, if true, provides the most support for the scientists' hypothesis?


A single millipede often gets passed around among several capuchins, all of whom rub their bodies with it.

The two chemicals that repel mosquitoes also repel several other varieties of insects.

The capuchins rarely rub their bodies with the millipedes except during the rainy season, when mosquito populations are at their peak.

Although the capuchins eat several species of insects, they do not eat the type of millipede they use to rub on their bodies.

The two insect-repelling chemicals in the secretions of the millipedes are carcinogenic for humans but do not appear to be carcinogenic for capuchins.

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情景：Capuchin经常在自己的身上擦千足虫（millipede），千足虫可以含有的元素可以有效防止蚊虫。因此，猴子们是因为这么做可以防蚊才擦千足虫的。

推理：
前提：“千足虫本身可以防蚊”和“Capuchin经常在自己的身上擦千足虫”之间存在正相关关系
结论：猴子们是因为这么做可以防蚊才擦千足虫的

答案预估：

要么同时提及“千足虫本身可以防蚊”和“Capuchin经常在自己的身上擦千足虫”，要么给“Capuchin经常在自己的身上擦千足虫”另外一个原因。

选项分析：

A选项： 一只千足虫经常会在几只Capuchin中穿梭，每一只Capuchin都擦上了这只千足虫。本选项提到了“Capuchin擦千足虫”这个事情，但是并没能解释“Capuchin擦千足虫”的原因，也没有提到“因”，所以不能评估此相关因果推理。

B选项：这两种能抵制蚊子的化学物质也会抵制其他种类的昆虫。该选项描述的是千足虫产生的可以防蚊的两种化学物质的特点，没能提及到“果”的问题，所以不能评估此相关因果推理。

C选项：Correct. 除掉蚊子特别多的雨季，Capuchin很少在自己的身上擦千足虫。本选项显然加强了防蚊和擦千足虫之间的因果关系。

D选项：虽然Capuchin吃一些种类的昆虫，但是它们从来不吃用来擦身体的千足虫。本选项描述的是Capuchin如何对待千足虫，和推理文段中给出的因果均没有联系。

E选项：千足虫分泌的两种抵制蚊子的化学物质对于人来说是致癌的，而对于Capuchin来说，并不致癌。本选项描述了两种化学物质的特点，只提到了“因”，没有提到推理文段中的“果”。

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Prep2008E2-CR
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