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03-11
GRE阅读以艰深著称，很多理论讲解使得考生觉得如雾里云中，下面，我带大家来一起做一篇题目 Over the years, biologists have suggested two main pathways bywhich sexual selection may have shaped the evolution of male birdsong.
这是本文的主题句，告诉我们一下的信息：
1.本文探讨的是一个现象，是关于鸟的歌曲的性选择问题。
2.本文是一个新老观点对比型的文章，关键词在第一段中间或者第二段开头
3.本文谈到了进化论，那么在文章后面很可能会否定这个说法，并且可能会进行批驳。
4.下文会以性内和性间选择分别展开进行论述。
In the first, male competition (这个就是讲性内选择了)and intrasexualselection produce relatively short, simple songs used mainly interritorial behavior. In the second, (不看也知道，这是讲性间选择)female choice andintersexual selection produce longer, more complicated songs usedmainly in mate attraction; like such visual ornamentation as thepeacock's tail, elaborate vocal characteristics increase the male'schances of being chosen as a mate, and he thus enjoys more reproductivesuccess than his less ostentatious rivals.
(以上到这里结束，做题时需要重点看的就是黑体字标示的字，通常来说，文章里面的极端语言需要记住它们的位置，比如最高级，比较级，表示唯一，单独的意思的词，可能出直接事实题)
The two pathways are not mutually exclusive, and we can expect tofind examples that reflect their interaction. (否定词也要记住位置，可能出改善题)Teasingthem apart has been an important challenge to evolutionarybiologists.(开始要调戏进化论生物学家)
Early research confirmed the role of intrasexual selection. In avariety of experiments in the field, males responded aggressively torecorded songs by exhibiting territorial behavior near the speakers.(以上是性内选择 )The breakthrough for research into intersexual sele...
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