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题目内容双击单词支持查询和收藏哦～
The mating system of humpback whales appears to rely on_____________: although humpbacks are found in widely varying densities throughout any winter breeding range, they frequently return in large numbers to specific locations.
- A.competition
- B.aggregation
- C.courtship
- D.adaptability
- E.innovation
B显示答案
以上解析由 考满分老师提供。
