GRE Reading Comprehension: JiJing 352-GRE阅读机经352篇 - RQ6CNA5355TF05V5J

The passage is primarily concerned with A. showing that intrasexual selection has a greater effect on birdsong than does intersexual selection B. contrasting the role of song complexity in several species of birds C. describing research confirming the suspected relationship between intersexual selection and the complexity of birdsong D. demonstrating the superiority of laboratory work over field studies in evolutionary biology E. illustrating the effectiveness of a particular approach to experimental design in evolutionary biology