因果类型题目其他解题技巧

熟悉我们申友GMAT解题技巧的同学们一定会对在因果题型板块下与之对应的两种解题技巧“排除他因（增强）”和“他因削弱（削弱）”印象深刻，在这里除了这两种主流的解题方式以外，我还想科普一下另外三种在因果题型下可以用到的方法，也许在使用的频次上不及以上谈到的两种技巧，但在过去的GMAT考试中确实也出现过一些对应的“偏题”

1.第一种叫做“无因无果（加强）”其实概念很好去理解，我们为了加强题干中所谈到的一组因果逻辑链，如果能证明在这组逻辑链下，因消失了，那么对应的果也会伴随消失，是不是也算是一种加强！来直接看题：

4. 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 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.

根据题型和影响关系的分析，我们不难看出这是属于路径型加强的题目，因为条件和结论是一致的都是在研究两个影响元素之间的关系

Millipedes - Mosquitoes

先不去研究正确选项，我们理出逻辑链之后还是根据传统的解题思路，做有关无关的排查吧。A选项说一种millipede 在很多种类的猴子们之间流传，描述的是millipede的普及程度吧，我们需要的是Millipedes - Mosquitoes 之间有关系，所以这个选项无关

B选项说Millipedes主要成分有其他的驱蚊效果，很明显与我们讨论的事物也无关

D选项说猴子不吃millipede。。。错的也很离谱对吧。。

E 选项说Mill 对猴子没伤害，可是却没有说明mill 确实是被用来驱蚊的所以也无关

其实用有关无关就可以排个七七八八了，不过我们还是要从解题思路来看看这道题

题目让我们去加强这组关系，传统的解法肯定会让我们去排除他因，也就是比如说XX物质也可以用来驱蚊，可是Monkey却没用用。不过这一题的者却选项（红字）却没用从这个角度去加强，而是说除非在蚊虫泛滥的时候猴子们才会用Millipedes，那么言下之意就是说如果蚊子不多，Millipede就用不着

理一下影响关系：

Millipedes(否)-Mosquitoes（否）

这就是所谓的无因无果

还有两种解法下次再说咯~ 敬请期待