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题目内容
When studying human history, one must be aware that the _____ between historical periods are arbitrary; certainly none of the people alive at the time were aware of a shift from one era to another.
- Ajudgements
- Bideologies
- Cinnovations
- Ddemarcations
- Eepisodes
D显示答案
以上解析由 考满分老师提供。