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  3. Mass transportation revised the social and economic fabric of the American city in three fundamental ways. It catalyzed physical

Mass transportation revised the social and economic fabric of the American city in three fundamental ways. It catalyzed physical

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问题     Mass transportation revised the social and economic fabric of the American city in three fundamental ways. It catalyzed physical expansion, it sorted out people and land uses, and it accelerated the inherent instability of urban life. By opening vast areas of unoccupied land for residential expansion, the omnibuses, horse railways, commuter trains, and electric trolleys pulled settled regions outward two to four times more distant from city centers than they were in the pre-modern era. In 1850, for example, the borders of Boston lay scarcely two miles from the old business district; by the turn of the 20th century the radius extended ten miles. Now those who could afford it could live far removed from the old city center and still commute there for work, shopping and entertainment. The new accessibility of land around the periphery of almost every major city sparked an explosion of real estate development and fueled what we now know as urban sprawl. Between 1890 and 1920, for example, some 250,000 new residential lots were recorded within the borders of Chicago, most of them located in outlying areas. Over the same period, another 550,000 were plotted outside the city limits but within the metropolitan area. Anxious to take advantage of the possibilities of commuting, real estate developers added 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 occupied; there was always a huge surplus of subdivided, but vacant land around Chicago and other cities. These excesses underscore a feature of residential expansion related to the growth of mass transportation; urban sprawl was essentially unplanned. It was carried out by thousands of small investors who paid little heed to coordinated land use or to future land users. Those who purchased and prepared land for residential purposes, particularly land near or outside city borders where 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 process. Real estate subdivision there proceeded much faster than population growth.
The author refers to both Boston and Chicago in order to______.
选项 A、contrast their rates of growth with each other
B、show that mass transit changed many cities
C、demonstrate positive and negative effects of growth
D、exemplify cities with and without mass transportation
答案B
解析 作者在第一段第三句中写道：“由于使用公共汽车、公路运输、市郊往返火车以及电车，使居住区离市中心的距离比过去远了2到4倍。”接着用for example举例：波士顿和芝加哥由于公交系统的发展使城区不断向四周扩展。可见，B)“表明公交系统改变了许多城市”反映了论点与论据之间的逻辑关系。
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