[0820]PERP07--逻辑37?

secretnancy · 发表于 2010-8-21 12:46:17

37. (32356-!-item-!-188;#058&006101)
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?
(A) Whether the two chemicals provide any protection for the millipedes against their own predators
(B) Whether the type of millipede used by the capuchin monkeys in Venezuela is found in other parts of the world
(C) Whether animals other than capuchins rub insects of any kind into their fur
(D) Whether the only time the millipedes are readily available to the capuchins is during the rainy season
(E) Whether secretions of any other insects accessible to the capuchins contain chemicals that repel mosquitoes

正确答案D
但是我觉得D也无关
millipedes在其他季节容易得到并不能代表在其他季节monkey也rub millipedes，而且题目已经说了“The rubbing behavior is rare except during the rainy season”

谢谢指教

恶霸 · 发表于 2011-8-14 17:51:41

原文的推理结构是： rubbing behavior 除了在蚊子最多的雨季，在其他季节是罕见的。因此monkeys rub the millipedes into their fur 是为了防蚊。对D取是，则只有在雨季猴子能得到millipedes ，这削弱了原文推理，因为这一点切断了rubbing behavior 只在雨季是因为雨季蚊子最多这一因果关系，既rubbing behavior 只在雨季是因为millipedes只有雨季才有，跟蚊子可能没有任何关系；对D取非，则millipedes不是只在雨季容易得到，则加强了原文，millipedes什么季节都有，可它偏偏只在雨季rub，更说明了雨季蚊子多。

恶霸 · 发表于 2011-8-22 21:41:25

这道题出的不太好，prep08已经把这道题改了，新题如下：
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. A single millipede often gets passed around among several capuchins, all of whom rub their bodies with it.
B. The two chemicals that repel mosquitoes also repel several other varieties of insects.
C. The capuchins rarely rub their bodies with the millipedes except during the rainy season, when mosquito populations are at their peak.
D. Although the capuchins eat several species of insects, they do not eat the type of millipede they use to rub on their bodies.
E. The two insect-repelling chemicals in the secretions of the millipedes are carcinogenic for humans but do not appear to be carcinogenic for capuchins.

[0820]PERP07--逻辑37?

所属分类: GMAT考试

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