There is no doubt that air pollution is a global crisis: it causes an annual death【C1】______of 6.5 million. That is double the t

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问题    There is no doubt that air pollution is a global crisis: it causes an annual death【C1】______of 6.5 million. That is double the total number of people lost【C2】______HIV/AIDS, tuberculosis and malaria【C3】______, and four times the number killed on the world’s roads. Half the early deaths result from outdoor air pollution that is far more dispersed and harder to【C4】______.
   Air pollution has increased the【C5】______of mental illness, diabetes and kidney disease. It is even thought to be prematurely ageing the faces of city dwellers by accelerating wrinkles and age【C6】______. What’s worse, almost 90% of the world’s children live where outdoor air pollution【C7】______WHO limits.
   Increasing efforts【C8】______global warming by cutting the fossil fuel consumption will help cut air pollution. Some major world cities are also doing something【C9】______traffic smog by setting dates【C10】______the worst polluting cars will be banned. The huge cuts in health costs that could be achieved with cleaner air are becoming better understood.
【C10】

选项 A、in which
B、for which
C、about which
D、by which

答案D

解析 空白处前面是“确定日期”,后面是“污染车禁行”,所以介词的选定应参考date。本句中,选择in which或about which时介词不合适,选择for which“为了这些日期”则意义不合适,只有by which最合理,意义是“截止”。
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