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On Pacific islands, a newly arrived gecko species, thehouse gecko, is displacing the previously established mourning gecko in urbanareas, but populations of the two species are more stable in rural areas farfrom human settlement. The house geckodoes not attack the mourning gecko, but in areas where insects congregate itprevents the mourning gecko from feeding on them.
Which of the following contributes most to an explanationof the difference between gecko populations in urban and rural areas?
(A) In urban areas, geckos are valued because they eat somany insects.
(B) Geckos defend territories against other members ofthe same species.
(C) House geckos that arrive on islands are carried therein boats and planes.
(D) In places where there are lighted buildings, insectstend to gather around the light.
(E) Mourning geckos are all females and reproduceasexually, but house geckos reproduce sexually.
看到答案说选D，不理解……
在uban H 在替代 M
在rural H M 都stable 但是虫子多的地方 H会妨碍M进食
个人认为D选型是无关信息，感觉非要选一个的话我会选B。
求解释，谢谢。 | 
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发表于 2012-12-27 16:16:55
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