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考研听力必备 第18期: British Columbia
British Columbia is the third largest Canadian provinces, both in area and population. It is nearly 1.5 times as large as Texas, and extends 800 miles(1,280km) north from the United States border. It2009-07-08 编辑：sunny 标签：
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考研听力必备 第17期: Botany
Botany, the study of plants, occupies a peculiar position in the history of human knowledge. For many thousands of years it was the one field of awareness about which humans had anything more than th2009-07-07 编辑：sunny 标签：
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考研听力必备 第16期: Plankton
Scattered through the seas of the world are billions of tons of small plants and animals called plankton. Most of these plants and animals are too small for the human eye to see. They drift about laz2009-07-03 编辑：sunny 标签：
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考研听力必备 第15期:Raising Oysters
In the oysters were raised in much the same way as dirt farmers raised tomatoes- by transplanting them. First, farmers selected the oyster bed, cleared the bottom of old shells and other debris, then2009-07-02 编辑：sunny 标签：
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考研听力必备 第14期:Oil Refining
Oil RefiningAn important new industry, oil refining, grew after the Civil war. Crude oil, or petroleum – a dark, thick ooze from the earth – had been known for hundreds of years, but little use had2009-07-01 编辑：sunny 标签：
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考研听力必备 第13期:Plate Tectonics and Sea-floor Spreading
The theory of plate tectonics describes the motions of the lithosphere, the comparatively rigid outer layer of the Earth that includes all the crust and part of the underlying mantle. The lithosphere2009-06-30 编辑：sunny 标签：
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考研听力必备 第13期:Icebergs
Icebergs are among nature’s most spectacular creations, and yet most people have never seen one. A vague air of mystery envelops them. They come into being ----- somewhere ------in faraway, frigid w2009-06-29 编辑：sunny 标签：
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考研听力必备 第12期:The Salinity of Ocean Waters
The Salinity of Ocean WatersIf the salinity of ocean waters is analyzed, it is found to vary only slightly from place to place. Nevertheless, some of these small changes are important. There are thre2009-06-22 编辑：sunny 标签：
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考研听力必备:第11期
Cohesion-tension TheoryAtmospheric pressure can support a column of water up to 10 meters high. But plants can move water much higher; the sequoia tree can pump water to its very top more than 100 me2009-06-19 编辑：sunny 标签：
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考研听力必备:第10期
American black bearsAmerican black bears appear in a variety of colors despite their name. In the eastern part of their range, most of these brown, red, or even yellow coats. To the north, the black2009-06-18 编辑：sunny 标签：
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考研听力必备:第9期
Coal-fired power plantsThe invention of the incandescent light bulb by Thomas A. Edison in 1879 created a demand for a cheap, readily available fuel with which to generate large amounts of electric p2009-06-17 编辑：sunny 标签：
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考研听力必备:第8期
StatisticsThere were two widely divergent influences on the early development of statistical methods. Statistics had a mother who was dedicated to keeping orderly records of government units (states2009-06-15 编辑：sunny 标签：
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考研听力必备:第7期
The concept of obtaining fresh water from icebergs that are towed to populated areas and arid regions of the world was once treated as a joke more appropriate to cartoons than real life. But now it i2009-06-12 编辑：sunny 标签：
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考研听力必备:第6期
The source of EnergyA summary of the physical and chemical nature of life must begin, not on the Earth, but in the Sun; in fact, at the Sun’s very center. It is here that is to be found the source o2009-06-11 编辑：sunny 标签：
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考研听力必备:第5期
Vision byHuman vision like that of other primates has evolved in an arboreal environment. In the dense complex world of a tropical forest, it is more important to see well that to develop an acute se2009-06-10 编辑：sunny 标签：
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