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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?

正确答案: D

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Please help me on this CR's question

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楼主
发表于 2008-3-29 21:09:00 | 只看该作者

Please help me on this CR's question

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

沙发
发表于 2008-3-30 08:06:00 | 只看该作者
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.
板凳
发表于 2008-3-30 15:07:00 | 只看该作者

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

地板
 楼主| 发表于 2008-3-30 19:43:00 | 只看该作者
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.
5#
发表于 2008-3-31 22:43:00 | 只看该作者
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……
6#
发表于 2008-4-1 01:10:00 | 只看该作者

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

7#
发表于 2008-4-1 01:10:00 | 只看该作者
我也是刚开始做CR不久...不对的地方希望前辈们指点
8#
发表于 2020-9-2 07:18:34 | 只看该作者
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。
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