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

TF阅读真题第831篇Jupiter's Moon lo

Dating Archaeological Objects     For contemporary archaeologists who need to know the age of any objects they study, perhaps the most precise and yet technologically ...

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...

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...

TF阅读真题第828篇The Growth of Industry in the United States

TF阅读真题第804篇Changes in United States Cinema

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

WS 032C2

The Collapse of Copán 题目：   The ancient Mayan kingdom of Copan, in what is now western Honduras, flourished for many years in the first millennium but declined sharpl...