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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 p

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【B1】______this week from U.N. Habitat, a United Nations agency.
    A century ago, 【B2】______than five percent of all people lived in cities. 【B3】______ the middle of this century it could be seventy percent, or【B4】______six and a half billion people. Already three-fourths of people in【B5】______countries live in cities. Now most urban population 【B6】______ is in the developing world.
    Urbanization can 【B7】______ to social and economic progress, but also put 【B8】______on cities to provide housing and【B9】______. The new report says almost two hundred thousand people move【B10】______cities and towns each day. It says worsening inequalities,【B11】______by social divisions and differences in【B12】______, could result in violence and crime【B13】______cities plan better.
    Another issue is urban sprawl. This is where cities【B14】______quickly into rural areas, sometimes【B15】______a much faster rate than urban population growth. Sprawl is【B16】______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【B17】______cities to smaller ones. He sees a【B18】______toward "de-urbanization" across the nation.【B19】______urban economies still provide many【B20】______that rural areas do not.
【B13】
选项 A、when
B、if
C、unless
D、whereas
答案C
解析 考查逻辑关系。该句意为“除非城市规划得更好，否则由社会分化和贫富差距造成的日益严重的不平等，可能会引起暴力和犯罪”，此处为条件关系，unless意为“除非，如果不”，符合句意，故选C。If作连词意为“如果，即使”，if not=unless；when作连词意为“当…时；既然”；whereas意为“然而”，均不符合句意。
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考研英语一

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