TF阅读真题第704篇Air-Breathing Fishes

TF阅读真题第822篇Newspapers in the Nineteenth-Century

TF阅读真题第784篇Proto-industrialization in Europe

Mars's Disappearing Atmosphere   For about the first billion years of its life, Mars was probably a watery planet. There are signs of past water in surface features, such as d...

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...

Developing Sustainable Pesticides   题目：   Pesticides are substances used to get rid of insects or other pests. A pesticide gets a bad name if, as is usually the case,...

TF阅读真题第838篇Germanic Invasions of the Roman Empire

  When studying an archaeological site, archaeologists must first try to understand how the society that lived there was organized. Some societies are centrally organized, and...

TF阅读真题第793篇Agriculture in Classical China

TF阅读真题第801篇Spectroscopy and the Substance of Stars