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标题: prep cr1 37(搜索过了，没有这个题的讨论，请各位NN解答） [打印本页]

作者: iwillmissyouso 时间: 2010-9-30 10:56
标题: prep cr1 37(搜索过了，没有这个题的讨论，请各位NN解答）

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

(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

答案是D,为什么不是E呢？

作者: 芷萱85 时间: 2010-9-30 11:25
委内瑞拉地区的c猴喜欢往身上擦m，因为m能分泌两种驱蚊的化学物质，蚊子身上的寄生虫会伤害c猴。c猴基本都在雨季擦m，此时也是蚊子最多的时候。c猴擦m是为了防蚊子。

d只有雨季才有m可以用（可能猴子擦m是为了美容，如果一年四季都有m，猴子会天天擦得）
e除m外。还有其他混在c猴身边的虫子（原来m是种虫子啊，⊙﹏⊙b汗）也能分泌驱蚊剂。试问，我抹了花露水和我的蚊香液好不好用有什么关系呢？

作者: iwillmissyouso 时间: 2010-9-30 11:29
呵呵~，明白了，万分感谢~！

作者: alanyao 时间: 2010-10-2 11:03
我还是不大明白，请问一下。原文说: The rubbing behavior is rare except during the rainy season. 所以M如只在雨季才有，猴子是只在雨季擦，M 一年到头都有，猴子也是只在雨季擦。那M啥时有，有啥关系呢？

作者: jay871750293 时间: 2012-3-30 10:32

我还是不大明白，请问一下。原文说: The rubbing behavior is rare except during the rainy season. 所以M如只在雨季才有，猴子是只在雨季擦，M 一年到头都有，猴子也是只在雨季擦。那M啥时有，有啥关系呢？

-- by 会员 alanyao (2010/10/2 11:03:50)

意思是说，有可能猴子是一年四季都需要M的（此时M的作用就不是防蚊了），但是如果M只在雨季出现，那么就会产生一种假象：猴子用M是为了防蚊（因为雨季蚊子最多嘛），如果M一年四季都有，而猴子只在雨季的时候用，则可以说明刚才的情况不是假象，猴子用M就是为了防蚊~

感觉讲得很凌乱，尽量体会吧...

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