2013年9月10日，国务院印发《大气污染防治行动计划》提出

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2013年9月10日，国务院印发《大气污染防治行动计划》提出，到2017年，全国地级及以上城市可吸入颗粒物浓度比2012年下降_________%以上，优良天数逐年提高。

A．10

B．20

C．30

D．40

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