求解一道逻辑题

ericwilliam · 发表于 2011-11-1 11:02:15

On Pacific islands, a newly arrived gecko species, the house gecko, is displacing the previously established mourning gecko in urban areas, but populations of the two species are more stable in rural areas far from human settlement.The house gecko does not attack the mourning gecko, but in areas where insects congregate it prevents the mourning gecko from feeding on them.

Which of the following contributes most to an explanation of the difference between gecko populations in urban and rural areas?

(A) In urban areas, geckos are valued because they eat so many insects.

(B) Geckos defend territories against other members of the same species.

(C) House geckos that arrive on islands are carried there in boats and planes.

(D) In places where there are lighted buildings, insects tend to gather around the light.

(E) Mourning geckos are all females and reproduce asexually, but house geckos reproduce sexually.
答案为啥是D呢？

ericwilliam · 发表于 2011-11-1 12:04:06

23.(28303-!-item-!-188;#058&003943)

A product that represents a clear technological advance over competing products can generally command a high price. Because technological advances tend to be quickly surpassed and companies want to make large profits while they still can, many companies charge the maximum possible price for such a product.But large profits on the new product will give competitors a strong incentive to quickly match the new product's capabilities.Consequently, the strategy to maximize overall profit from a new product is to charge less than the greatest possible price.

In the argument above, the two portions in boldface play which of the following roles?

(A) The first is a consideration that has been raised to argue that a certain strategy is counterproductive; the second presents that strategy.

(B) The first is a consideration raised to support the strategy that the argument recommends; the second presents that strategy.

(C) The first is a consideration raised to explain the appeal of a certain strategy; the second presents that strategy.

(D) The first is an assumption, rejected by the argument, that has been used to justify a course of action; the second presents that course of action.

(E) The first is a consideration that has been used to justify pursuing a goal that the argument rejects; the second presents a course of action that has been adopted in pursuit of that goal.

答案选C，为什么？THX

gelilong · 发表于 2011-11-1 13:52:00

你的第一个问题，
看下question，它提到了difference between gecko populations in urban and rural areas，也就是说它已经认定difference 发生了，
那么，rural和urban肯定至少有一个方面不同而导致populatin difference发生，
没错，这个不同之处就是灯光！
在乡村，两个鸟相安无事，互不干涉
但是在urban，因为urban有更多的灯光，而灯光会聚集昆虫， mourning gecko会灯光附近捕虫，但是house gecko会去打搅mourning，自然morning的数量会受影响了

本贴相关题目 GMATPrep-2007E2-CR-1 (IYSB)

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