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

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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...

Transportation and Urban Development in Los Angeles   题目：   In the early twentieth century, the key urban problem in the United States was congestion. Streetcars (pu...

  Part 1 READING PASSAGE 1 Read the text on the next page and answer Questions 1-13. Prison: The Solution or the Problem? In the Netherlands and parts of the USA such as Jo...

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...

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...

  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...

Wool Manufacturing in Europe in the High Middle Ages   During the High Middle Ages (1000-1300 c.E.), the Baltic Sea, North Sea, and English Channel tied together the peoples...

Lighting in Museums       The practice of reducing light exposure in museums was prompted by the publication, in 1978， of Garry Thomson's book, The Museum Environ...