[填空题]Urban life has always involved a balancing of opportunities and{{U}} (11) {{/U}}against dangers and stress; its{{U}} (12) {{/U}}force is, in the broadest sense, money. Opportunities to make money mean competition and competition is stressful; it is often at its most intense in the largest cities, where opportunities are greatest. The presence of huge numbers of people inevitably involves more conflict, more traveling, the{{U}} (13) {{/U}}of public services and{{U}} (14) {{/U}}to those{{U}} (15) {{/U}}and criminals who are drawn to the rich pickings of great cities. Crime has always{{U}} (16) {{/U}}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{{U}} (17) {{/U}}may become trapped in their homes by the fear of crime around them. As a defense against these developments,{{U}} (18) {{/U}}:contacts with oth

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