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[新东方背诵文选] 新东方背诵文选 Lesson 47:Folk
Folk Cultures A folk culture is a small isolated, cohesive, conservative, nearly self-sufficient group that is homogeneous in custom and race with a strong family or clan structure and highly develop -
[新东方背诵文选] 新东方背诵文选 Lesson 46:Visi
Vision by Human 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 s2006-05-12 编辑:alex 标签: 每日课堂
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[新东方背诵文选] 新东方背诵文选 Lesson 45:The&
The source of Energy A 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 s...2006-05-12 编辑:alex 标签: 每日课堂
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[新东方背诵文选] 新东方背诵文选 Lesson 44:Obta
44.Obtaining Fresh water from icebergs 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 t -
[新东方背诵文选] 新东方背诵文选 Lesson 43:Stat
Statistics There 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 (states -
[新东方背诵文选] 新东方背诵文选 Lesson 42:Coal
42.Coal-fired power plants The 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 electr -
[新东方背诵文选] 新东方背诵文选 Lesson 41:Amer
American black bears American 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 black -
[新东方背诵文选] 新东方背诵文选 Lesson 40:Cohe
Cohesion-tension Theory Atmospheric 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 m -
[新东方背诵文选] 新东方背诵文选 Lesson 39:The&
The Salinity of Ocean Waters If 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 th -
[新东方背诵文选] 新东方背诵文选 Lesson 38:Topa
Topaz Topaz is a hard, transparent mineral. It is a compound of aluminum, silica, and fluorine. Gem topaz is valuable. Jewelers call this variety of the stone "precious topaz". The best-... -
[新东方背诵文选] 新东方背诵文选 Lesson 37:Iceb
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 fa... -
[新东方背诵文选] 新东方背诵文选 Lesson 36:Plat
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 o -
[新东方背诵文选] 新东方背诵文选 Lesson 35:Oil&
Oil Refining An 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 had -
[新东方背诵文选] 新东方背诵文选 Lesson 34:Rais
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 ot -
[新东方背诵文选] 新东方背诵文选 Lesson 33:Plan
Plankton浮游生物. 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. Th
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经济学人:全球房价过热 警惕繁华背后的泡沫
全球化创建了几个大都市。不管它们所在国家的经济状况如何,这些大都市都吸引 -
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经济学人:全球一线城市房价暴涨 究竟是什么在
旧金山房地产市场与技术部门关系紧密,自2008年起,美国全国证券交易商协 - 3
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