TF阅读真题第834篇Group living

The growing population of eighteenth-century Europe increased demand for cloth to clothe people. Urban merchants turned to rural people for additional, inexpensive labor: farming f...

WS 032L2

TF阅读真题第796篇Hermit Crabs in Snail Shells

TF阅读真题第710篇Impressionists and Their Paints

TF阅读真题第775篇Animal Communication

Insect Colony Movement     In general, colonies of social insects such as bees or ants move either to change nesting sites when the current site deteriorates in quality,...

The Proto-Indo-European Language     Scholars have known for several centuries that most of the languages spoken in a broad swath from Britain to India are derived from ...

题目： The Emergence of the State Before there was agriculture, people lived in small, loosely organized bands or tribes that hunted for and collected food in the wild. The emerg...

TF阅读真题第845篇Urbanization of Japan