GRE Reading Comprehension: JiJing 352-GRE阅读机经352篇 - P2755CJYAMC655LCJ

The passage suggests that the song sparrow experiments mentioned failed to confirm the role of intersexual selection because A. females were allowed to respond only to the song structure B. song sparrows are unlike other species of birds C. the experiments provided no evidence that elaborate songs increased male reproductive success D. the experiments included the songs of only a small number of different song sparrows E. the experiments duplicated some of the limitations of previous field studies