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{{U}}
62 {{/U}}the inherent instability of urban life. By opening vast
areas of unoccupied land for residential expansion, the buses,{{U}} 63
{{/U}}, commuter trains, and electric trolleys pulled settled regions
outward two to four times more{{U}} 64 {{/U}}from city centers than
they were in the pre-modern era. In 1850, for example, the borders of Boston
lay{{U}} 65 {{/U}}two miles from the old business district; by the
turn of the century the{{U}} 66 {{/U}}ex tended ten miles. Now those
who could afford it could live far removed from the old city center and still{{U}}
67 {{/U}}there for work, shopping, and{{U}} 68 {{/U}}The
new accessibi A. exploration B. entrainment C. travel D. communication 我来回答: 提交
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