Climate change has been linked to greenhouse gases in Earth's atmosphere that allow sunlight to reach the planet's surface while trapping the infrared energy that it emits...

TF阅读真题第856篇Irrigation and Early Civilizations

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716篇Indus River Valley Civilization

 Greek Art in the Classical Age   Greek art is thought to have reached its peak during the Classical period in the fifth century B.C.E. Leading up to this period, the most co...

Britain's Industrialization     The Industrial Revolution was an extended period of economic growth and change brought about by the application of mineral energy and t...

Benefits of Migration Why do animals migrate? One obvious answer is to escape cold weather by moving to a warmer region. Each fall, millions of monarch butterflies migrate southw...

题目： Submerged Plant Life:Surviving Underwater   Whereas a land plant expends a great deal of energy on the production of roots that can forage in the soil for vital water ...

TF阅读真题第692篇Communication: Bumblebees Versus Honeybees

TF阅读真题第846篇Insect Size