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...

题目： Sea Life Adaptations in the Deep Ocean   Marine scientists identify several zones within the ocean's vertical water column, from the sunlit surface to the deep, dar...

TF阅读真题第678篇Telescopes

TF阅读真题第848篇Wool production in Europe on the high Middle Ages

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...

TF阅读真题第691篇Natufians and the Domestication of Grain

TF阅读真题第810篇The Evolution of Grass and Herbivores

TF阅读真题第726篇The Horse and the Camel in Early China

Lenape Horticulture       Older scholarship on Native Americans assumed that, at the time of their first contact with Europeans, Native Americans in the northeaste...

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 (...