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

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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.
【C3】

选项 A、By
B、Through
C、Along
D、To

答案A

解析 考查介词辨析。该句意为“到本世纪中叶,城市人口可能上升至70%”,By在这里表示“截止到某个时间”,故选A.By。To表示“到…(时间)”时,一般用在from…to结构中,故排除。其他两项中,Through意为“通过”,Along意为“沿着”,均不符合句意。
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