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[填空题]Urban life has always involved a balancing of opportunities and{{U}} (36) {{/U}}against dangers and stress; its{{U}} (37) {{/U}}force is, in the broadest sense, money. Opportunities to make money mean competition and competition is stressful; it is often at its most{{U}} (38) {{/U}}in the largest cities, where opportunities are greatest. The presence of huge numbers of people inevitably involves more conflict, more traveling, the{{U}} (39) {{/U}}of public services and{{U}} (40) {{/U}}to those{{U}} (41) {{/U}}and criminals who are drawn to the rich pickings of great cities. Crime has always{{U}} (42) {{/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}} (43) {{/U}}may become trapped in their homes by the fear of crime around them.
As a defense against these developments,{{U}} (44) {{/U}}: contac