求教，prep07-#2-1

杂色百合2012

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.

D正确选项为什么感觉跟题目那么不相关啊？！我都不知道怎么联系上的。。。

sdcar2010

In urban areas, there are more lighted buildings than in rural areas.

In urban areas, insects tend to gather around the light in lighted buildings. The house gecko prevents the mourning gecko from feeding on the insects attracted around light. Thus, in urban areas, the house gecko displaces mourning gecko since the latter is starved to death.

In rural areas, far fewer lights, far fewer insects attracted to light, far fewer incidents in which the house gecko prevents the morning gecko from feeding on insects. Thus, their populations are stable.

杂色百合2012

thx so much. however, the logic of the question is really twisting