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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.
【C19】
选项 A、where
B、when
C、what
D、how
答案A
解析 空格后的从句修饰前面的borders，故应填入引导定语从句的关系代词。borders为表地点的名词，故填A项where，引导修饰地点的定语从句。B项when引导的是修饰时间的定语从句。C项what一般用来引导名词性从句，没有修饰作用。D项how表示方式，不引导定语从句。
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