17.Evolution of sleep Sleep is very ancient. In the electroencephalographic sense we share it with all the primates and almost all the other mammals and birds: it may extend back as far as the reptiles. There is some evidence that the two types of s

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03 The Definition of Price Prices determine how resources are to be used. They are also the means by which products and services that are in limited supply are rationed among buyers. The price system of the United States is a complex network compose

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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

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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

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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

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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

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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

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42 Two Goats on the Bridge One day a goat started to cross a little bridge. At that very minute, another goat started out from the other side of the bridge. When they saw one another, they knew that one of them would have to go back. Go back!?cried t

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52 Dream Billy is twelve years old. One day his father gave him fifty pence. There is a big tree in Billy's garden. He climbed it and sat in it. He likes that place in the tree very much. Then Billy looked at his money and said, I'm going to go to th

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59 Swimming When I was a boy, I liked swimming very much. Once my two brothers and I spent the summer holidays with my uncle and aunt in their house by the sea. It was only twenty meters from the water. Every day we put on our swimming shorts before

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[00:04.88]Five of the world's largest drug companies [00:03.88]have agreed to reduce the price of drugs designed to control the disease AIDS for people in developing countries. [00:12.37]The agreement was reached after talks between United Nations he

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