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  3. Until recently, most population growth has occurred in relatively dense urban environments. In【C1】______words, even if we were w

Until recently, most population growth has occurred in relatively dense urban environments. In【C1】______words, even if we were w

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问题     Until recently, most population growth has occurred in relatively dense urban environments. In【C1】______words, even if we were witnessing rapid population growth, that would not mean that the【C2】______were filling in with people.【C3】______, the urban areas would tend to become more crowded.
    Historically, we find that people have moved to【C4】______the jobs were. Jobs were usually in ports or locations with many natural【C5】______. After transportation became relatively cheap, other geographical locations became【C6】______of economic activity. One factor that determines where people will move to, even when transportation becomes cheap, is【C7】______. And individuals working in cities【C8】______higher incomes than those working in【C9】______areas. Hence, population has tended until the 1970s to【C10】______in our major urban centers. Recently population has【C11】______out of the Northeast to the South and to the West for the more pleasant climates. If people did not【C12】______from living in large cities, there would likely be a much more even population distribution【C13】______our entire land area.
    Probably, if this【C14】______the case , there would be less concern over population 【C15】______Indeed, one need only【C16】______a cross-country drive or plane trip to realize how【C17】______sparsely populated these United States really are. This is not to say that we should or should not do something about【C18】______growth. The shortage of people in certain areas merely demonstrates that overpopulation in the United States is really only a problem in【C19】______urban environments. And this problem may be slowly correcting【C20】______.
【C6】
选项 A、channels
B、routes
C、sources
D、centers
答案D
解析 本句大意为：在交通变得便宜以后，其他(城市以外)的地区成了经济活动的中心。
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