Urban life has always involved a balancing of opportunities and【B1】______ against dangers and stress; its【B2】______ force is, in

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问题     Urban life has always involved a balancing of opportunities and【B1】______ against dangers and stress; its【B2】______ force is, in the broadest sense, money. Opportunities to make money mean competition and competition is stressful; it is often at its most【B3】______ in the largest cities, where opportunities are greatest. The presence of huge numbers of people inevitably involves more conflict, more traveling, the【B4】______ of public services and【B5】______ to those【B6】______  and criminals who are drawn to the rich pickings of great cities. Crime has always【B7】______ in the relative anonymity of urban life, but today’s ease of movement makes its control more difficult than ever; there is much evidence that its extent has a direct relationship to the size of the communities. City【B8】______ may become trapped in their homes by the fear of crime around them.
    As a defense against these developments,【B9】_______________________ : contacts with other people are generally made brief and impersonal; doors are kept locked; telephone numbers may be ex-directory; Journeys outside the home are usually hurried, rather than a source of pleasure.【B10】________________________ . Furthermore, all these defensive forms of behavior are harmful to society in general; they cause widespread loneliness and destroy the community’s concern for its members.
    【B11】___________________________ .
【B4】

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