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[跟可可背精美短文] 跟可可背精美短文 第51篇:Scientific Theories科学
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：admin
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[跟可可背精美短文] 跟可可背精美短文 第50篇:Schooling and Ed
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：admin
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[跟可可背精美短文] 跟可可背精美短文 第49篇:Salt and Metabol
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：admin
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[跟可可背精美短文] 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：admin
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[跟可可背精美短文] 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：admin
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[跟可可背精美短文] 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：admin
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[跟可可背精美短文] 跟可可背精美短文 第45篇:Police and Commu
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：admin
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[跟可可背精美短文] 跟可可背精美短文 第44篇:Plate Tectonics板块结构与海
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：admin
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[跟可可背精美短文] 跟可可背精美短文 第43篇:Plants in the&nb
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：admin
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