TF阅读真题第815篇Archaeopteryx and Bird Evolution

TF阅读真题第808篇Effects of Plate Tectonics on Species

TF阅读真题第832篇Canals and Railroads in the Early 19th

TF阅读真题第827篇The Theory of Geographic Speciation

The Australlan Megatauna Extinctions Many of the species of large animals(megafauna) such as mammoths, mastodons, ground sloths, and giant deer that roamed the Earth tens of thous...

TF阅读真题第838篇Germanic Invasions of the Roman Empire

Sources of Prosperity during China's Song Dynasty     In the tenth century. after a period of political fragmentation, China began to enjoy a peaceful and prosperous per...

TF阅读真题第809篇Animal Locomotion

TF阅读真题第802篇Effects of Deforestation in Nineteenth

TF阅读真题第816篇Characteristics of Seaweeds