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PREP2007的逻辑没有详解吗??

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发表于 2012-7-6 15:59:07 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
(24021-!-item-!-188;#058&000691)

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?
就是以这个开始的
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