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题目内容
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.
- Aconvey urgency
- Benhance vigilance
- Cincrease cooperatiom
- Dattract attention
- Emmimize risk
E显示答案
以上解析由 考满分老师提供。