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[新东方背诵文选] 新东方背诵文选 Lesson 41:American bla
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 black2006-05-12 编辑：admin
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[新东方背诵文选] 新东方背诵文选 Lesson 40:Cohesion-tension&
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 m2006-05-12 编辑：admin
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[新东方背诵文选] 新东方背诵文选 Lesson 39:The Salinity
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 th2006-05-12 编辑：admin
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[新东方背诵文选] 新东方背诵文选 Lesson 38:Topaz
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-k..2006-05-12 编辑：admin
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[新东方背诵文选] 新东方背诵文选 Lesson 37:Icebergs
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 far..2006-05-12 编辑：admin
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[新东方背诵文选] 新东方背诵文选 Lesson 36:Plate Tecton
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 o2006-05-12 编辑：admin
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[新东方背诵文选] 新东方背诵文选 Lesson 35:Oil Refining
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 had2006-05-12 编辑：admin
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[新东方背诵文选] 新东方背诵文选 Lesson 34:Raising Oyst
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 ot2006-05-12 编辑：admin
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[新东方背诵文选] 新东方背诵文选 Lesson 33:Plankton
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. Th2006-05-12 编辑：admin
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