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  • 新东方优美背诵短文50篇 Unit36: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 lithosphere(n.[地]岩石圈)is divided into a few dozen plates o...

  • 新东方优美背诵短文50篇 Unit35: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 ever been made of it. In the 1850s Samuel M. Kier, a manufacturer i...

  • 新东方优美背诵短文50篇 Unit34:Raising Oysters

    34 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, then scattered clean shells about....

  • 新东方优美背诵短文50篇 Unit33:Plankton浮游生物

    33 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. They drift about lazily with the currents, provid...

  • 新东方优美背诵短文50篇 Unit32:Botany

    32 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 the vaguest of insights. It is impossible...

  • 新东方优美背诵短文50篇 Unit31:British Columbia

    31 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. It includes Canadas entire west...

  • 新东方优美背诵短文50篇 Unit30:The origin of Refrigerators

    30 The origin of Refrigerators By the mid-nineteenth century, the term icebox had entered the American language, but ice was still only beginning to affect the diet of ordinary citizens in the United States. The ice trade grew with the growth of cit...

  • 新东方优美背诵短文50篇 Unit29:Telecommuting

    29 Telecommuting Telecommuting-- substituting the computer for the trip to the job ----has been hailed as a solution to all kinds of problems related to office work. For workers it promises freedom from the office, less time wasted in traffic, and h...

  • 新东方优美背诵短文50篇 Unit27:Scientific Theories

    27. 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 the way an observed event could be produced. A good example of thi...

  • 新东方优美背诵短文50篇 Unit26:International Business and Cross-cultura

    26. International Business and Cross-cultural Communication The increase in international business and in foreign investment has created a need for executives with knowledge of foreign languages and skills in cross-cultural communication. Americans,...

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