2013年4月gre考试备考:gre阅读完整机经集锦(8)
17.鸟叫研究(是原文吗??) 鸟的叫声的property,有两种类型,一种intergroup,另一种withgroup(不确定是不是这个叫 法),intergroup很好的documented了,因为分布范围广,有差异什么的,鸟对特定叫声就作出特定反应,而withgroup研究困难, 因为鸟很少对鸣叫作出特定反应;问题中问到了recent research对intergroup研究到什么成果; Over the years, biologists have suggested two main pathways by which sexual selection may have shaped the evolution of male birdsong. In the first, male competition and intrasexual selection produce relatively short, simple songs used mainly in territorial behavior. In the second, female choice and intersexual selection produce longer, mor... [ 查看全文 ]2013年4月gre考试备考:gre阅读完整机经集锦(8)的相关文章