2011年12月30日，环境保护部常务会议审议并原则通过的《

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2011年12月30日，环境保护部常务会议审议并原则通过的《环境空气质量标准》增设PM2.5平均浓度限值和臭氧8小时平均浓度限值。这是我国首次制定PM2.5的国家环境标准。这是

A．践行科学发展观,实施可持续发展战略的必然选择

B．以牺牲经济快速发展为代价的

C．我国科学技术水平不断提高的表现

D．必然能遏制我国环境恶化的趋势

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