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GRE考試閱讀技巧分析筆記
GRE閱讀以艱深著稱，很多理論講解使得考生覺得如霧里云中，下面，我?guī)Т蠹襾硪黄鹱鲆黄}目
Over the years, biologists have suggested two main pathways by which sexual selection may have shaped the evolution of male birdsong.
這是本文的主題句，告訴我們一下的信息：
1.本文探討的是一個(gè)現(xiàn)象，是關(guān)于鳥的歌曲的性選擇問題。
2.本文是一個(gè)新老觀點(diǎn)對(duì)比型的文章，關(guān)鍵詞在第一段中間或者第二段開頭
3.本文談到了進(jìn)化論，那么在文章后面很可能會(huì)否定這個(gè)說法，并且可能會(huì)進(jìn)行批駁。
4.下文會(huì)以性內(nèi)和性間選擇分別展開進(jìn)行論述。
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, more complicated songs used mainly in mate attraction; like such visual ornamentation as the peacocks tail, elaborate vocal characteristics increase the males chances of being chosen as a mate, and he thus enjoys more reproductive success than his less ostentatious rivals.
The two pathways are not mutually exclusive, and we can expect to find examples that reflect their interaction. Teasing them apart has been an important challenge to evolutionary biologists.
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