TOEFL Reading: ETS-TOEFL阅读机经 - 81GCPB6V9WE653PRL$

According to paragraph 1, it is generally thought that the ability to glide is useful to forest-dwelling species because gliding A. allows them to adapt to a wide variety of forest conditions B. eliminates the need to travel long distances in search of food C. provides a rapid, energy-efficient way of descending from the top of a tree to the ground D. enables them to move through the forest without being exposed to predators on the ground