GMAT逻辑

因果关系的GMAT逻辑题目迎刃而解

2015-12-22 15:47:47 立思辰留学 4008-941-360

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作为GMAT考试众多科目的一科,GMAT逻辑有点抽象,应对GMAT逻辑推理有什么技巧?面对因果关系的逻辑题目,你有木有大脑当机?不要着急,接下来留学360专家就为大家整理了GMAT逻辑技巧的说明,帮你应对GMAT逻辑难题。

GMAT逻辑推理对很多同学来说都是一大难点,只有掌握好GMAT逻辑技巧才能从容应对GMAT逻辑题库。

无因就无果

在假设题型里,如果想要找出段落推理的一个必要条件,那么我们首先就应明确,这个必要条件就是使得推理必然成立的一个假设,假设必为支持性假设。

例:

The population of peregrine falcons declined rapidly during the 1950’s and 1960’s and reached an all-time low in the early 1970’s. The decline was attributed by scientists to the widespread use of the pesticide DDT in rural areas

Which of the following, if true, gives the strongest support to the scientists’ claim?

(A) DDT was not generally in use in areas devoted to heavy industry

(B) In the time since the use of DDT was banned in 1972, the population of peregrine falcons has been steadily increasing

(C) Peregrine falcons, like other birds of prey, abandon eggs that have fallen out of the nest, even if the eggs remain intact

(D) Starlings, house sparrows, and blue jays-birds the peregrine falcon preys on were not adversely affected by DDT in their habitats

(E) Other birds of prey, such as the osprey, the bald eagle, and the brown pelican, are found in the same areas as is the peregrine falcon.

题干是由果推因,游隼数量下降由使用杀虫剂(DDT)所致,我们不妨将“游隼数量下降”视为B, 而将“使用DDT”视为A, 如果由B→A正确,那么我们就可以得出没有A就不会存在现在的B,因此我们就可以推断两种情况,DDT禁用前与DDT禁用后游隼在数量上的比较,如果在 DDT禁用后,游隼数量开始增加的话,那么我们就会非常肯定的是确实是杀虫剂的使用导致了游隼数量的减少。这种类型的题目出错的主要原因有两点:一:考生无法把握题干要求,在段落内容之外进行推理;二:无法将题干给出的原因视做唯一原因。

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