responds aggressively to recorded songs
27. The passage suggests that the song sparrow experiments mentioned in lines 37-43 failed to confirm the role of intersexual selection because
females were allowed to respond only to the song structure
song sparrows are unlike other species of birds
the experiments provided no evidence that elaborate songs increased male reproductive success
the experiments included the songs of only a small number of different song sparrows
the experiments duplicated some of the limitations of previous field studies
答案:17-27:ECCDCDBDADC
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