Q18 In contrast to environmentalists proposals to limit emissions of certain pollutants, the administration proposed calling for mandatory restrictions of only three such pollutants from power plants-mercury, sulfur dioxide, and nitrogen oxides-and the plan would delay such cuts until 2010 or later. A. administration proposed calling for mandatory restriction of B. administration proposed a call for mandatory restrictions, including those for C. administration, proposing mandatory restrictions on D. administration’s proposal was a call for mandatory restrictions, which include administration’s proposal would call for mandatory restrictions on 我选E，答案是D | 
