4. Sulfur dioxide, a major contributor to acid rain, is an especially serious pollutant because it diminishes the respiratory system's ability to deal with all other pollutants. 正确答案（A）原句 我的选项（C）an especially serious pollutant because it diminishes the capability of the respiratory system in dealing C选项错误，是因为不能使用dealing吗？
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发表于 2010-8-22 10:48:59
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