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TF阅读真题第744篇The K/T Boundary
In the late 1970s, several research groups were trying to determine the cause of the boundary between the geological layers corresponding to the Cretaceous and Tertiary periods, ab...
TF阅读真题第699篇Transportation and American Development
TF阅读真题第699篇Transportation and American Development
TF阅读真题第745篇Centralized Societies: Archaeological Evidence
When studying an archaeological site, archaeologists must first try to understand how the society that lived there was organized. Some societies are centrally organized, and...
