TF阅读真题第777篇Fishing in Early Egypt

TF阅读真题第776篇The Choreography of Merce Cunningham

TF阅读真题第779篇The Decline of the Large Blue Butterfly in England

    How the First People Got to the Interior of North America   Most researchers believe that the first people to come to North America came from Asia to what is no...

Martian Volcanoes       Earth is not the only planet to have volcanoes; in fact Mars-though all of its volcanoes have long been inactive-has the two largest ones i...

  Bartering was a basic trade mechanism for many thousands of years; often sporadic and usually based on notions of reciprocity, it involved the mutual exchange of commoditi...

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774篇Greece Emerges from the Dark Ages

TF阅读真题第773篇Facial Expressions

Underground Water The hydrosphere is the collective mass of water at or near Earth’s surface. Beneath the land surface is the underground water component of the hydrosphere. The ...