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.
(E) Mourning geckos are all females and reproduce asexually, but house geckos reproduce sexually.
我没有看懂....我理解的是urban：HG>MG.rural:HG=MG...然后那句but in areas where insects congregate it prevents the mourning gecko from feeding on them.是HG阻止MG吃虫子。。。那个in areas是指哪个areas？答案也没理解== 请求高人指点。谢谢！！！