TOEFL Reading: ETS-TOEFL阅读机经 - QF3HN654DG98PQN2L$

According to paragraph 5, how does cooperation help gazelles avoid predation? A. The herd forms a defensive circle around the weakest members of the group. B. Because they share food, all of the animals are well nourished and ready to run. C. The herd makes a lot of noise, which scares off predators. D. Some animals watch for danger while others concentrate on feeding.