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题目内容双击单词支持查询和收藏哦～
Some biologists argue that each specifically human trait must have arisen gradually and erratically, and that it is therefore difficult to isolate definite _____in the evolution of species.
- A.fluctuations
- B.generations
- C.predispositions
- D.milestones
- E.manifestations
D显示答案
以上解析由 考满分老师提供。
