By the late 1989,thousands of cooperating networks were participating in the Internet

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• f you travel by air across the center of Africa or South America, you fly over forests for thousands of kilometers. 如果你坐飞机旅行穿越非洲中部或者南美洲，你就飞过了上万公里的森林。These great forests are the oceans of trees. There are thousands and thousands of different kinds of

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• There are two great mysteries about the beach. One is why human beings flock there by thousands, only to prostrate(俯卧) themselves in dense packs of glistening flesh. The other is why the sand goes there. Strange as it seems, oceanographers have never really understood why sand piles up on the shore. Now Douglas Inman and Daniel Conley think they have solved the puzzle.

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• Throughout history, people have been interested in knowing how language first began, but no one knows exactly where or how this happened. However, we do know a lot about languages, the languages of today and also the languages of earlier times. There are probably about three thousand languages in the world today. Chinese is the language with the most speakers. English, Russian and Spanish are also spoken by millions of people. On the other hand, some languages in the world have less than one hundred speakers.

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• The incident occurred during the Toronto Zoo’s 28th annual Christmas Treats Walk, where admission is free in return for donation of food that does not easily go bad.Thousands of people attend each Boxing Day to see the animals fed by their handlers.

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• The use of nuclear power has already spread all over the world.（1）, scientists still have not agreed（2）what should be done with the large amounts of waste material that（3）to increase every year. Most waste materials are（4）of simply by placing them somewhere. But nuclear waste must be（5）with great care. It（6）dangerous radiation and it will continue to be（7）for hundreds, thousands, even millions of years.

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• In the late 1950s, the Transformational-Generative grammar proposed by______began to bring a revolution in linguistics.

  A．Saussure B．Bloomfield C．Halliday D．Chomsky

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• _______ late 1990’s, about two thousand adults were enrolled in correspondence study in the community.

  A.The B.In the C.It wast he D.It was in the

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