GRE Reading Comprehension: JiJing 352-GRE阅读机经352篇 - LQ85RVN2513SUS74J

It can be inferred from the passage that early naturalists considered which of the following criteria when classifying beavers? A. The genetic similarity of beavers and muskrats B. The propensity of beavers to relocate C. The depth of water beavers occupied D. Beavers' dam-building capabilities E. Beavers' degree of exposure to danger