Agricultural Origins   It is tempting to think that people started domesticating plants and animals because hunting and gathering was laborious and then someone had the brilli...

Language and Migration 题目： The study of language can offer important clues about the historic migration of people around the world. Most historians would place the emergence o...

Degradation and Erosion of Soil Land without soil can support only very small primitive plants such as lichens and mosses that can cling onto a rock surface. The rest of the worl...

Dating the Ancient Egyptian Pyramids   题目：   The first step toward discovering the age of the ancient Egyptian pyramids is to determine for whom they were built. Ea...

Creativity   A basic question about creativity is, what factors produce it? Several contrasting answers have been proposed. Cognitive psychologists, for example, have tended t...

How Did Life Begin For life to begin, it needed the right sorts of molecules, some sort of energy(such as that created by lightning), and the right environment-perhaps the 'warm l...

题目： The Fur Trade and Native Americans Soon after Europeans made contact with the aboriginal peoples of North America, known as Native Americans, trading became the focus of ...

Building Materials in the Nineteenth Century       For most of the nineteenth century, European architects built in historical revival styles (styles that imitate ...

The Global Industrial Revolution   题目：   In fewer than a hundred years, the global process of industrialization utterly transformed Great Britain, most of continenta...

TF阅读真题第854篇Why Did Social stratification Emerge