题目内容
（请给出正确答案）
[主观题]
听力原文：Mass transportation revised the social and economic fabric of the American city i
n three fundamental ways. It catalyzed physical expansion, it sorted out people and land uses, and it accelerated the inherent instability of urban life.
The speaker mentioned all of the following as effects of mass transportation on cities EXCEPT？
A．Growth in city area
B．Separation of commercial and residential areas.
C．Changes in life in the inner city.
D．Increased standards of living.
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