Jazz   Jazz music, an art form original to the United States, originated in the southern city of New Orleans at the turn of the twentieth century. It combined the elements of ...

Debating the Agricultural Diet     An affluent society is one in which resources are ordinarily not scarce and most society members have achieved a general level of econ...

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TF阅读真题第813篇when honeybees become foragers

  Sunspot Cycles   Dark regions on the Sun, called sunspots, were studied in 1610 by Galileo, who turned the newly invented telescope on objects in the sky. A lively deba...

Chimpanzee Communication     Do animals communicate deliberately, meaning do they communicate with a goal in mind? It would help if we could ask them what they intended ...

TF阅读真题第806篇Maya Population in the Classic Period

    综合写作：   Reading： The black robin is a small bird native to the islands of New Zealand. Several decades ago, black robins almost died out. Although the fu...

Early Food Production in Africa   Farming appeared in Africa by 5000 B.c.E. Eventually, several different styles of food production developed. These variations were caused by ...

Sources of Prosperity during China's Song Dynasty     In the tenth century. after a period of political fragmentation, China began to enjoy a peaceful and prosperous per...