[单项选择]Nowadays, cities are becoming more and more crowded. Some pessimists (悲观者)are deeply worried about the serious problems caused by the huge populations. They believe that the public services are already overloaded and near the verge of collapse. Especially in some developing countries, the metropolis(大城市) are overcrowded all the time. Crowded streets, stuffed buses and jammed subways continuously affect people’s lives. Some optimists, however, see the current problems as merely part of an evolutionary process. They argue that London and New York had similar problems but were able eventually to establish an orderly and safe environment for their citizens. It seems that people become the controversial factor here. Either they themselves as inhabitants cause inconvenience to each other, or they participate together in city developing plans and contribute efforts to facilitate city life. Human elements are therefore the center for determining the future of big cities.
The last sentence i
A. good management systems are essential
B. a great leader is all important
C. the more people, the better
D. big cities have no bright future

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