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  3. Mass transportation revised the social and economic fabric of the American city in three fundamental ways. It speeded up physica

Mass transportation revised the social and economic fabric of the American city in three fundamental ways. It speeded up physica

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问题     Mass transportation revised the social and economic fabric of the American city in three fundamental ways. It speeded up physical expansion, it sorted out people and land uses, and it【C1】________the inherent instability of urban life.【C2】________opening vast areas of unoccupied land for residential expansion, the buses,【C3】________commuter trains, and electric trolleys pulled settled regions outward two to four times more【C4】________from city centers than they were in the pre-modern era. In 1850, for example, the borders of Boston lay【C5】________two miles from the old business district; by the turn of the century the【C6】________extended ten miles. Now those who could afford it could live far removed from the old city center and still【C7】________there for work, shopping, and【C8】________. The new accessibility of land around the periphery of almost every major city【C9】________an explosion of real estate development and fueled what we now【C10】________as urban sprawl. Between 1890 and 1920, for example, some 250,000 new residential lots were recorded within the borders of Chicago,【C11】________of them located in outlying areas. Over the same period, another 550,000 were plotted outside the city limits【C12】________within the metropolitan area. Anxious to take advantage of the possibilities of commuting, real estate developers【C13】________800,000 potential building sites to the Chicago region in just thirty years—lots that could have housed five to six million people.
    Of course, many were never【C14】________; there was always a huge surplus of subdivided, but vacant, land around Chicago and other cities. These【C15】________present a feature of residential expansion【C16】________the growth of mass transportation: urban sprawl was essentially unplanned. It was【C17】________by thousands of small investors who paid little care to coordinated land use or to【C18】________land users. Those who purchased and prepared land for residential purposes, particularly land near or outside city borders【C19】________transit lines and middle-class inhabitants were anticipated, did so to create demand as much as to respond to it. Chicago is a prime example of this【C20】________. Real estate subdivision there proceeded much faster than population growth.
【C17】
选项 A、planned out
B、carried forward
C、carried out
D、figured out
答案C
解析 上文说，城市蔓延是无计划的。根据空格后的内容by thousands of small investors(由成千上万小投资者)，可推测城市蔓延是由这些小投资者投资地产而来的，故选carried out“进行，完成”。A项planned out“为……做出准备”，这与上文的unplanned(无计划的)相矛盾。B项carried forward“发扬光大。继续进行”，指的是把已有的传统、精神发扬光大，或者把已经进行的事情继续下去，文中并没提到城市蔓延由谁先开头，自然就没有继续进行的意思。D项figured out“计算出；弄明白”，与“城市蔓延”无法搭配。
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