The confirmation researchers had been seeking was finally achieved in studies involving two varieties of warblers.

　　Unlike the song sparrow, which repeats one of its several song types in bouts before switching to another, the warbler continuously composes much longer and more variable songs without repetition. For the first time, researchers found a significant correlation between repertoire size and early mating, and they discovered further that repertoire size had a more significant effect than any other measure of male quality on the number of young produced. The evidence suggests that warblers use their extremely elaborate songs primarily to attract females, clearly confirming the effect of intersexual selection on the evolution of birdsong.

　　请各位记住，读GRE文章不在于读懂全文，你根本没有时间读懂。你只是 处理 文章，主要线索就是论点和论据，论据大部分不用记住，只要知道在那里就是，要做快，还需要非常清楚地对于某些理论的态度，这样才可以不至于恐慌。下面我们看题目：

　　21. The passage is primarily concerned with

　　这种题目叫做主题题，一般做法是 三出现 ，主题词必须出现，细节，新内容不能出现。细节，指的就是把这个词从文章拿走，文章不会受影响，依然可以存在的东西。新内容，指的是文章完全没有谈到的东西。

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