再问一道逻辑GWD6-15

Yvonne_yu

Q15:

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?

 

1. A single millipede often gets passed around among several capuchins, all of whom rub their bodies with it.
2. The two chemicals that repel mosquitoes also repel several other varieties of insects.
3. The capuchins rarely rub their bodies with the millipedes except during the rainy season, when mosquito populations are at their peak.
4. Although the capuchins eat several species of insects, they do not eat the type of millipede they use to rub their bodies.
5. The two insect-repelling chemicals in the secretions of the millipedes are carcinogenic for humans but do not appear to be carcinogenic for capuchins.

我的思路：蚊子多的时候涂m少的时候不涂，说明m是用来驱蚊的，所以选c。 为什么答案是Ｅ？ｍ对人是致癌的对猴子不致癌就能说明猴子用ｍ来驱蚊的么？

daniel_lew

答案是C啊 BABY