2. 外语
  3. Half a century ago, most people lived in【B1】______areas. However, according to the most recent estimate【B2】______by the United N

Half a century ago, most people lived in【B1】______areas. However, according to the most recent estimate【B2】______by the United N

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问题     Half a century ago, most people lived in【B1】______areas. However, according to the most recent estimate【B2】______by the United Nations, more than half of all people will live in cities by 2012, for the first time in history. City life is not always a bad thing, but many experts worry about this process of【B3】______. According to a new report from the Worldwatch Institute, an environmental  research group in Washington, it is having a huge【B4】______on human health and the【B5】______of the environment. Of the three billion people who live in cities now, about one billion live in【B6】______settlements. These are areas of poverty, slums, that generally lack basic services like clean water, or even【B7】______housing. More than 60 million people are added to cities and their【B8】______areas each year, mostly in slums in developing countries. Molly O’Meara Sheehan, the leading researcher of the Worldwatch report, believes that【B9】______Policymakers, she says, need to increase investments in education, health care and other areas.
【B10】______. For example, Freetown in Sierra Leone has established farming within the city limits to meet much of its growing food demands. In Bogota, the capital of Colombia,【B11】______.
【B4】
选项
答案effect
解析 前面有不定冠词a和形容词，所以空格处应该填入一个名词。
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大学英语四级

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