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  3. Over half the world’s people now live in cities. The latest "Global Report on Human Settlements" says a significant change took

Over half the world’s people now live in cities. The latest "Global Report on Human Settlements" says a significant change took

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问题     Over half the world’s people now live in cities. The latest "Global Report on Human Settlements" says a significant change took place last year. The report【C1】______this week from U.N. Habitat, a United Nations agency.
    A century ago, 【C2】______than five percent of all people lived in cities. 【C3】______ the middle of this century it could be seventy percent, or【C4】______six and a half billion people. Already three-fourths of people in【C5】______countries live in cities. Now most urban population 【C6】______is in the developing world.
    Urbanization can【C7】______to social and economic progress, but also put【C8】______on cities to provide housing and 【C9】______. The new report says almost two hundred thousand people move【C10】______cities and towns each day. It says worsening inequalities,【C11】______by social divisions and differences in【C12】______ , could result in violence and crime【C13】______ cities plan better.
    Another issue is urban sprawl. This is where cities【C14】______quickly into rural areas, sometimes【C15】______a much faster rate than urban population growth. Sprawl is【C16】______ in the United States. Americans move a lot. In a recent study, Art Hall at the University of Kansas found that people are moving away from the【C17】______cities to smaller ones. He sees a 【C18】______toward "de-urbanization" across the nation.【C19】______urban economies still provide many【C20】______ that rural areas do not.
【C19】
选项 A、Then
B、But
C、For
D、While
答案B
解析 考查逻辑关系。这句话说的是城市有农村地区没有的优点，与前面提到的“逆城市化”的趋势是转折关系，所以要用B．But。Then表示承接；For表示原因；While表示对比，均不符合句意。
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