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...

The Greenhouse Effect on Venus   The nitrogen and oxygen gases that make up the bulk of Earth's atmosphere neither absorb nor emit thermal radiation, energy that is released f...

Archaeological Evidence for Social Complexity   题目：     Ancient human groups that used advanced technology and divided labor into highly specialized roles are c...

  题目： Living-History Museums in the United States       The living-history approach to teaching social history combines restored or re-created historical ...

  题目： French Gothic Cathedrals Gothic-style cathedrals, known for their impressive height. pointed arches, and intricate line patterns, are among the most elaborate s...

TF阅读真题第835篇Sauropod Teeth and Nostrils

Life on Mars Astronomers strongly suspect that Mars currently has no liquid water, diminishing the chances for life there now. But running water and a denser atmosphere in the pas...

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

听力音频： 口语第200套（zt031） https://mp.weixin.qq.com/s/VZKj1UaJ6n_3cXO8pM_KOA Task1 Many regions in the world face problems with air pollution. What can be done to decrea...

PART 1 READING PASSAGE 1 You should spend about 20 minutes on Questions 1-13, which are based on Reading Passage 1 below. THE BAOBAB TREE The baobab tree is an icon of the African...