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42.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 the bill, and it fuel
新概念优美背诵短文50篇
41.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 or white in color. Even
新概念优美背诵短文50篇
40 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. Until the end of the ni
新概念优美背诵短文50篇
45.The source of Energy A summary of the physical and chemical nature of life must begin, not on the Earth, but in the Sun; in fact, at the Suns very center. It is here that is to be found the source of the energy that the Sun constantly pours out i
新概念优美背诵短文50篇
44.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 more appropriate to cartoons than real life. But now it is being con
新概念优美背诵短文50篇
Scott: Donna. Donna: Hi, I just wanted to say, I understand _______________________________, but when your wife is ____, ___________________________, all she wants is somebody to _____ to her. She does not _____ someone ________________________. Scot
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21 The Origin of Sports When did sport begin? If sport is, in essence, play, the claim might be made that sport is much older than humankind, for , as we all have observed, the beasts play. Dogs and cats wrestle and play ball games. Fishes and birds
新概念优美背诵短文50篇
20 The Historical Significance of American Revolution The ways of history are so intricate and the motivations of human actions so complex that it is always hazardous to attempt to represent events covering a number of years, a multiplicity of perso
新概念优美背诵短文50篇
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,
新概念优美背诵短文50篇
25. Movie Music Accustomed though we are to speaking of the films made before 1927 as silent, the film has never been, in the full sense of the word, silent. From the very beginning, music was regarded as an indispensable accompaniment; when the Lum
新概念优美背诵短文50篇
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
新概念优美背诵短文50篇
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 Canada s entire west coast and the isl
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