TF阅读真题第803篇London’s Second-Century Decline

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

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...

TF阅读真题第820篇The Greek City-States_ Sparta and Athens

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

TF阅读真题第841篇The Beginnings of Radar Astronomy

Coal's Rise and Fall Changes in the use of coal over time are reflected in the environment. In the eighteenth century most peppered moths had black spots on white wings, but in th...

TF阅读真题第836篇Changes in Ancient Egyptian Art Production

TF阅读真题第819篇The Growth of Play in Children

Extraterrestrial lmpact and Megafauna Extinctions     About 13,000 years ago, near the end of a period called the Pleistocene, North America was populated by megafauna (...