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[单项选择]The earth is witnessing an urban revolution, as people worldwide crowd into towns and cities. In 1800 only five percent of the world’s population were urban dwellers; now the proportion has risen to more than forty-five percent, and by the year 2010 more people will live in towns and cities than in the countryside. Humanity will, for the first time, have become a predominantly urban species.
Though the world is getting more crowded by the day, absolute numbers of population are less important than where people concentrate and whether these areas can cope with them. Even densities, however, tell us nothing about the quality of the infrastructure’-roads, housing and job creation, for example--or the availability of crucial services.
The main question, then, is not how many people there are in a given area, but how well their needs can be met. Density figures have to be set beside measurements of wealth and employment, the quality of housing and the availability of education, me
A. to warn about the dangers of revolutions in towns
B. to warn about the possibility of a population explosion
C. to suggest governments should change their priorities
D. to suggest governments invest in more housing in cities