[单项选择]

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Economic conditions have improved during the past decade in many North American and European CBDs, primarily because of an unprecedented pace of office construction. Downtowns that were generally considered dead and beyond help as recently as the 1970s are now filled with both local residents and tourists, even during evenings and weekends when offices are closed. The new downtown 6ffices, shops, and recreation facilities provide cities with additional tax revenues that can be used to maintain essential services.
The underclass The atmosphere of animation and prosperity found in many CBDs does not extend to the surrounding residential areas. With the exception of a handful of renovated neighborhoods, the zone in transition is inhabited by large numbers of persons who are frequently referred to as a permanent underclass. These inner-city residents are increasingly trapped in an unending cycle of economic and
A. lack of industriousness
B. poor education
C. financial problems
D. negative attitude toward’work

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