TF阅读真题第778篇The Evolution of Reptiles and Therapsids

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775篇Animal Communication

TF阅读真题第774篇Greece Emerges from the Dark Ages

TF阅读真题第773篇Facial Expressions

TF阅读真题第772篇The Development of Agriculture

The Role of Climate Change and Ecology in History   A popular activity of historians and nonhistorians alike has long been to try to associate historical developments with cha...

    Economics begins with the assumption that human actions are rational-intended for maximum self-benefit. For example, people pay more for a larger box of the same cer...

Characteristics of Tropical Rain Forests Almost all the action in a rain forest (not just photosynthesis but also flowering, fruiting, predation, and herbivory) happens high in t...