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  3. Although the United States cherishes the tradition it is a nation of small towns and wide open spaces, only one in every eight A

Although the United States cherishes the tradition it is a nation of small towns and wide open spaces, only one in every eight A

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问题      Although the United States cherishes the tradition it is a nation of small towns and wide open spaces, only one in every eight Americans now lives on a farm. The recent population trend has been a double one, toward both urbanization and suburbanization. Metropolitan areas have grown explosively in the past decade, and nearly half this increase has been in the suburbs. With the rapid growth of cities has come equally rapid decentralization. The flight of Americans from the central city to the suburbs constitutes one of the greatest migrations of modern times; quite residential sections outside cities have become conglomerations of streets, split-level houses, and shopping centers.
     This spurt of suburban expansion, however, does not alter the basic fact that the United States has become one of the most urban nations on the face of the earth. Census Bureau figures show that the rural population has been shrinking steadily since 1830. When the United States became a nation it had no large cities at all; today some fifty cities have population of more than 258,000. Mammoth complexes of cities are developing in the area of the East Coast and the east north central states, on the Pacific and Gulf coasts, and near the shores of the Great Lakes. Some sociologists now regard the entire 600-mile stretch between Boston and Washington D.C. an area holding a fifth of the country’s population as one vast city or, as they call it, megalopolis.
Decentralization is best defined as ______.
选项 A、movement from the central city to nu’al areas
B、movement from the central city to the suburbs
C、disorderly expansion of the central city
D、shrinking of metropolitan
答案B
解析 文中提到decentralization后，马上提出“The night of Americans from the central city to the suburbs．．．”因此选B项。
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