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答案                             The Interstate Highway System
     In the United States it is possible to drive more than four thousand kilometers/ from the east coast on tile Atlantic Ocean to the west coast on the Pacific Ocean. / You can also drive more than two thousand kilometers/ from near the Canadian border south to the Mexican border. /
     You can drive these distances on wide, safe roads/ that have no traffic signals or stop signs. / In fact, if you did not have to stop for gasoline or sleep,/ you could drive almost anywhere in the United States without stopping at all. /
     This is possible because of the Interstate Highway system. / This system has almost seventy thousand kilometers of roads. / It crosses more than fifty-five thousand bridges/ and can be found in forty nine of America’s fifty states. /
     The Interstate Highway system is usually two roads, one in each direction,/ separated by an area that is planted with grass and trees. / Each road holds two lines of cars that can travel at speeds between/ one hundred and one hundred twenty kilometers an hour. /
     The Interstate Highway system has been an important part/of the nation’s economic growth during the past forty years. / Experts believe that trucks using the system/ carry about seventy-five percent of all products that are sold. / Jobs and new businesses have been created near the busy Interstate Highways all across the United States. / These include hotels, motels, eating places,/ gasoline stations and shopping centers. /

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