Please help me on this CR's question

ybalawan

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.

I cannot understand why the answer is D?

BTW, Mine is B

三十以后

Because in urban areas, there're so many lights so insects tends to gather together while in rural area, the lights are not so many so insets do not gather together.

pharmacystar

不明白

这个题似乎是比较两种  gecko的

D只能比较urban 和  rural的不同

ybalawan

The question is to ask the explanation the different between gecko populations in urban and rural areas, but the answer, I think, does not explain either house gecko or mourning gecko population in urban and rural.

narcisuss

题干里唯一提到的影响morning gecko数目的原因是在昆虫聚集地区，house gecko会prevent the morning gecko from feeding on them.

所以只有D和题目有关系，别的选项都是臆断。

不过我是小白，今天刚开始做逻辑题……

twang1981

在ＲＵＲＡＬ地区，ＨＯＵＳＥ的阻止ＭＯＵＲＮＩＮＧ的，说明ＨＯＵＳＥ比ＭＯＵＲＩＮＧ厉害

在ＵＲＢＡＮ地区，虫子都聚灯下了，所以ＨＯＵＳＥ和ＭＯＵＲＮＩＮＧ都去灯那里，但是ＨＯＵＳＥ厉害，ＭＯＵＲＮＩＮＧ就少了，因为吃不到虫子了

twang1981

我也是刚开始做ＣＲ不久．．．不对的地方希望前辈们指点

典座

我觉得这题按相关性可以直接秒杀B选项，讨论中心是两个不同品种的壁虎，而B选项说的是相同品种的壁虎相互攻击（other members of the same species），所以B讨论中心就错了。