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题目内容
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 the species.
- Afluctuations
- Bgenerations
- Cpredispositions
- Dmilestones
- Emanifestations
D显示答案
以上解析由 考满分老师提供。