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跟可可背精美短文 第52篇:Skyscrapers and Environment摩天大楼与环境
在线试听和英语短文Skyscrapers and Environment Inthe late1960's,manypeople inNorth Americaturnedtheir attentionto environmental problems,andnew steel-and-glassskyscraperswere widely criticized.Ecolo2009-01-09 编辑：alex 标签： 我来听写
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跟可可背精美短文 第51篇:Scientific Theories科学理论
在线试听和英语短文Scientific Theories In science, a theory is a reasonable explanation of observed events that are related. A theory often involves an imaginary model that helps scientists picture t2009-01-08 编辑：alex 标签： 我来听写
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跟可可背精美短文 第50篇:Schooling and Education
在线试听和英语短文Schooling and Education Itis commonly believed in the United Statesthatschooliswhere peoplegotoget an education.Nevertheless, it has beensaidthat today children interrupt their edu2009-01-05 编辑：alex 标签： 我来听写
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跟可可背精美短文 第49篇:Salt and Metabolism
在线试听和英语短文Salt and Metabolism Just how salt became so crucial to our metabolism is a mystery; one appealing theory traces our dependence on it to the chemist ry of the late Cambrian seas. It2009-01-04 编辑：alex 标签： 我来听写
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跟可可背精美短文 第48篇:Raising Oysters饲养牡蛎
在线试听和英语短文Raising Oysters In the past oysters were raised in much the same way as dirt farmers raised tomatoes - by transplanting them. First, farmers selected the oyster bed, cleared the bo2008-12-31 编辑：alex 标签： 我来听写
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跟可可背精美短文 第47篇:Pottery陶器
在线试听和英语短文Pottery Ancient people made clay pottery because they needed it for their survival. They used the pots they made for cooking, storing food, and carrying things from place to place.2008-12-30 编辑：alex 标签： 我来听写
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跟可可背精美短文 第46篇:Population Growth人口增长
在线试听和英语短文Population Growth The growth ofpopulationduring thepastfewcenturiesisnoproofthat population will continue to grow straight upward toward infinity and doom. On the contrary, demogra2008-12-29 编辑：alex 标签： 我来听写
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跟可可背精美短文 第45篇:Police and Communities警察与社区
在线试听和英语短文Police and Communities Few institutions are more important to an urban community than its police, yet there are few subjects historians know so little about. Most of the early acade2008-12-26 编辑：alex 标签： 我来听写
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跟可可背精美短文 第44篇:Plate Tectonics板块结构与海床扩展
在线试听和英语短文PlateTectonicsandSea-floor Spreading The theory of plate tectonics describes the motions of the lithosphere, the comparatively rigid outerlayerofthe Earththat includes all thecrust2008-12-25 编辑：alex 标签： 我来听写
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跟可可背精美短文 第43篇:Plants in the Deserts 沙漠中的植物
在线试听和英语短文Plants in the Deserts Some cacti, like the saguaro, grow to tree size, but true trees need more moisture than most desert environments can supply, so they are scarce on deserts. Cl2008-12-24 编辑：alex 标签： 我来听写
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跟可可背精美短文 第42篇:Plankton浮游生物
在线试听和英语短文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 eye2008-12-23 编辑：alex 标签： 我来听写
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跟可可背精美短文 第41篇:Piano钢琴
在线试听和英语短文Piano The ancestry of the piano can be traced to the early keyboard instruments of the fifteenth and sixteenth centuries -- the spinet, the dulcimer, and the virginal. In the seven2008-12-21 编辑：alex 标签： 我来听写
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跟可可背精美短文 第40篇:Oil Refining炼油
在线试听和英语短文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 years2008-12-19 编辑：alex 标签： 我来听写
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跟可可背精美短文 第39篇:Oil and Water油和水
在线试听和英语短文Oil and Water To understand the emulsifying process, we must first accept the scientific principle that oil and water do not naturally mix. Quite literally, they find each other's2008-12-18 编辑：alex 标签： 我来听写
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跟可可背精美短文 第38篇:Obtaining Fresh Water from
在线试听和英语短文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 mo2008-12-17 编辑：alex 标签： 我来听写
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