Why Did Agriculture Arise   Sometime around 10,000 years ago, some hunter-gatherers took up agriculture. Though the advantages may seem obvious, there are also disadvantages: ...

  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...

TF阅读真题第814篇Agriculture in Colonial New England

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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...

The Moon's Origin   One of the earliest scientific theories about the Moon's origin postulated that Earth and its moon formed out of a dust cloud alongside one another, much a...

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    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...

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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 ...