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  • 新东方背诵文选 L42.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 electric power. Coal seemed to fit...

  • 新东方背诵文选 L41.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 bear is actually gray...

  • 新东方背诵文选 L40 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 meters above the ground. U...

  • 新东方背诵文选 L39 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 three basic processes that cause...

  • 新东方背诵文选 L38 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-known precious topaz...

  • 新东方背诵文选 L37 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 faraway, frigid wat...

  • 新东方背诵文选 L36.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(...

  • 新东方背诵文选 L35.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...

  • 新东方背诵文选 L34 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...

  • 新东方背诵文选 L33 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 lazi...

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