终于晓得长沙好点的网页设计培训机构在哪里
发布时间: 2019-09-17 19:37:53
下面小编跟大家一起了解GRE阅读解释练习分享,希望对大家的学习有所帮助。
During the Pleistocene epoch, several species of elephants isolated on islands underwent rapid dwarfing.This phenomenon was not necessarily confined to the Pleistocene, but may have occurred much earlier in the Southeastern Asian islands, although evidence is fragmentary. Several explanations are possible for this dwarfing. For example, islands often have not been colonized by large predators or are too small to hold viable predator populations. Once free from predation pressure, large body size is of little advantage to herbivores. Additionally, island habitats have limited food resources, a smaller body size and a need for fewer resources would thus be favored. Interestingly, the island rule is reversed for small mammals such as rodents, for which gigantism is favored under insular conditions.
本文提出一个现象:孤岛上的大象变小了(标红一句),并列出可能的解释:没有天敌大体型没有优势同时小体型耗能更低(标红第二第三句),提出小型动物恰好相反,在孤岛上体型大更有利(标红第四句)。
1. The primary purpose of the passage is toA. question the plausibility of one explanation sometimes offered for the dwarfing of certain species living on islandsB. argue that dwarfing of certain species living on islands occurred prior to the PleistoceneC. cite evidence suggesting that dwarfing may have adverse consequences for some species living on islandsD. present some possible explanations for the dwarfing of certain species living on islandsE. contrast the effects of insular conditions on species with large body size and species with small body
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