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TF阅读真题第943篇The Origin of Flight in Birds
The Origin of Flight in Birds 题目： Debate over avian origins was stimulated in 1861 when the 150-million-year-old fossil of a bird-like creature was unearthed. Called Archaeopt...
TF阅读真题第925篇Animal Farming in the Chesapeake Colonies
Animal Farming in the Chesapeake Colonies The Chesapeake colonies were established by English settlers near Chesapeake Bay in North America in the seventeenth century. Tobacco pr...
TF阅读真题第917篇Extraterrestrial lmpact and Megafauna Extinctions
Extraterrestrial lmpact and Megafauna Extinctions About 13,000 years ago, near the end of a period called the Pleistocene, North America was populated by megafauna (...
TF阅读真题第844篇Climate Change and Species Distribution
TF阅读真题第844篇Climate Change and Species Distribution
TF阅读真题第929篇Where Did the Carbon Go?
Where Did the Carbon Go? Over the last several hundred thousand years, atmospheric carbon dioxide (CO2) levels decreased when Earth's glacial ice sheets were ...
TF阅读真题第965篇The Emergence of the State
题目： The Emergence of the State Before there was agriculture, people lived in small, loosely organized bands or tribes that hunted for and collected food in the wild. The emerg...
