PREP一道关于猴子和蚊子的题 求牛人教

melodyldeeaves

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

答案是D，不明白它怎么就对了  如果否定选项可以削弱题目，如果肯定选项也不能削弱啊，

chelseeea

如果猴子只在雨季擦，说明猴子只在有蚊子的时候才擦（和咱的花露水一样）
如果平时没事就擦，那说明跟驱蚊不驱蚊无关（和香水一样），用来擦着玩，擦着爽，擦着无聊的

小fly

还是没明白，选项说m只有在雨季是可得到的，这也不能说明猴子平时擦不擦啊....

chelseeea

不好意思，这道题没读完凭记忆就答了。谢谢指出来！！

D: hether the only time the millipedes are readily available to the capuchins is during the rainy season

回答YES，说明之M只有有蚊子的时候才在，只有有蚊子的时候猴子才（能）擦，驱蚊
回答NO，说明M平常就很AVAILABLE，而开头一段说猴子有M就常常擦，那就说明M是猴子擦着玩的

这样说是不是好一点？欢迎拍砖的！！

melodyldeeaves

其实人家就是想让你找到m和雨季的linking。因为雨季必然蚊子多，m必然能杀蚊，但是猴子是不是想要用m来杀蚊不确定。但是如果一年四季都有m，猴子偏挑夏天擦，那必然是为了灭蚊呗，如果只有夏天有m，那可能还是觉得感兴趣擦着玩儿呢。

mudiduange

回答NO，说明M平常就很AVAILABLE，而开头一段说猴子有M就常常擦，那就说明M是猴子擦着玩的



这个解释有点问题，文中说了猴子在雨季以外的时间很少擦。怎么会变成常常擦呢？

wodexia52

如果这种植物只在雨季有的话 那么猴子在雨季搽他是weaken 结论
但是如果全年都有 但是猴子只在雨季搽的话 说明是用来驱赶蚊子的

danielsu

chelseeea 发表于 2011-5-19 16:59
如果猴子只在雨季擦，说明猴子只在有蚊子的时候才擦（和咱的花露水一样）如果平时没事就擦，那说明跟驱蚊不 ...

老哥太生动了！！2333