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.
Ans: D
我完全搞不懂 为什么D 可以解释HG 和 MG 的差异 (D) 里描述 insects 都 gather around the light 但文章里没半个字题到 MG 和light 的关西阿??
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