In open grasslands there is no place for a large animal to hide. Thus a watchful grazing animal will see the slight movement that betrays the presence of a predator long before it is close enough to launch an attack. It sounds as though the hunters (predators) stand no chance at all. Unfortunately for the grazers, life is not so simple, however. A grazing animal must lower its head and look at the ground to feed. Its attention may be occupied for only a few seconds before it raises its head and resumes its watch while chewing the food it took, but hunters are patient and skillful and are concentrating intensely. Those few seconds provide time enough to advance a few steps and then freeze, body flattened against the ground. It may take hours, but eventually these repeated small advances will put the hunter within range--close enough to outrun its prey--and the long time the hunt has taken will have been worthwhile, because the resulting feast will be highly nutritious.
- A.They spend significantly more time looking down at the ground than they do with their heads raised
- B.They tend to remain within a relatively small area for extended periods of time
- C.They are extremely difficult for predators to see as long as they remain motionless
- D.They can run significantly faster than most of their predators
D는 NOT TRUE라고 생각해서 거르고, C는 포식자가 인내심이 좋고 계속 집중하고 있다는 뜻에서 NOT TRUE로 거를 수 있을 거 같은데 A의 오답근거와 B의 정답근거를 찾는것을 도와주시면 감사드리겠습니다!