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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870篇Classical Greek Tragedy
Classical Greek Tragedy In 534 B.c.E. the city-state of Athens in what is today Greece added performances of tragedies to its annual festival honoring the go...
TF阅读真题第901篇Human Responsibility for Megafaunal Extinctions
Human Responsibility for Megafaunal Extinctions Paleontologists are intrigued by the question of what caused a diverse group of large animals (megafauna) to become e...
TF阅读真题第937篇Wool Manufacturing in Europe in the High Middle Ages
Wool Manufacturing in Europe in the High Middle Ages During the High Middle Ages (1000-1300 c.E.), the Baltic Sea, North Sea, and English Channel tied together the peoples...
TF阅读真题第848篇Wool production in Europe on the high Middle Ages
TF阅读真题第848篇Wool production in Europe on the high Middle Ages
TF阅读真题第756篇Impact of Railroad Transportation in the United States
Both the steamboat and the railroad system with its steam-powered trains revolutionized transport in the United States in the nineteenth century. Entire regions that would hardly h...
