TF阅读真题第700篇Canals and Railroads in the Early Nineteenth Century

TF阅读真题第728篇Europe's Economic Recovery in the Fifteenth Century

TF阅读真题第694篇Formation of Earth's Atmosphere and Oceans

It is now generally accepted that dinosaurs (and large numbers of other animals and plants) went extinct about 65 million years ago, when Earth was hit by a giant asteroid (a rocky...

TF阅读真题第705篇Freehold Society in Colonial New England

Woody plants produce a great variety of chemical compounds to provide protection against other plants, diseases, and herbivores (plant-eating animals) big and small. These chemical...

The physical and chemical properties of water, unsurprisingly, determine much about life in the ocean. Water is dense (high mass per unit of volume), about 840 times as dense as ai...

TF阅读真题第732篇Viral Plant Parasites

TF阅读真题第685篇The Medieval Agricultural Revolution

The sauropod dinosaurs were gigantic, long-necked herbivores (plant eaters) that flourished during the Jurassic period (201-145 million years ago). At the same time that the saurop...