2013gre考试备考:gre阅读精选题目及答案(十)
以下是GRE阅读试题精选,考生可参考进行日常的复习,提高阅读能力。 The evolution of sex ratios has produced, in most plants and animals with separate sexes, approximately equal numbers of males and females. Why should this be so? Two main kinds of answers have been offered. One is couched in terms of advantage to population. It is argued that the sex ratio will evolve so as to maximize the number of meetings between individuals of the opposite sex. This is essentially a “group selection” argument. The other, and in my view correct, type of answer was first put forward b... [ 查看全文 ]2013gre考试备考:gre阅读精选题目及答案(十)的相关文章