GRE Reading Comprehension: PPO-GRE阅读PPO - 5GUP74HJNHUD4OX1R

The primary purpose of the passage is to A. contrast two different but closely related animal behaviors B. present the findings of a particular study of animal behavior C. account for a particular behavior observed in mammals D. question the evidence used to support a hypothesis about a particular animal behavior E. explain how the methodology of a particular study of animal behavior affected its findings