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The calls some birds make in the presence of predators are structured to ______________: with tapered starts and stops, these calls lack the abrupt onsets that would provide cues to predators about the sounds'origin.
- A.convey urgency
- B.enhance vigilance
- C.increase cooperatiom
- D.attract attention
- E.mmimize risk
E显示答案
以上解析由 考满分老师提供。
