题目

随着“绿色青奥会”的理念逐渐深入人心，空气质量日益受到人们的关注。下列物质中，未计入监测空气污染指数项目的是 （       ）                   A．氮气        B．二氧化硫      C．一氧化碳     D．可吸入颗粒物 答案：A—Why did your family buy a second-hand car?—We couldn’t afford a new one, but even an old one is better than _________.A. noB. noneC. eitherD. neither