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标题: GWD 6-15 [打印本页]

作者: liangqi77 时间: 2007-11-15 20:03
标题: GWD 6-15

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 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.

我选了C，但是答案是E，why？

作者: ahwhbear622 时间: 2007-11-15 20:32
我的答案就是C哦

作者: dtstruggle 时间: 2007-11-15 21:38

应该选C

E中的与人的对比是个新对比，不能支持上文

不能说对人行不通，对猴子却行的通，就证明某种东西是特别为猴子准备的

个人觉得用充分必要的概念能更好地理解

作者: liangqi77 时间: 2007-11-16 07:54
C也是有问题的，原文中明确说明“Capuchin monkeys often rub their bodies with a certain type of millipede”，但C中说“The capuchins rarely rub their bodies with the millipedes”，直接与原文相违背，不妥

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