2020 Jiangsu Question 1 Single-choice Differentiating 2020_江苏 Paper 1.打赢蓝天保卫战，提高空气质量。下列物质不属于空气污染物的是 A. PM2. 5B. $\mathrm { O } _ { 2 }$C. $\mathrm { S O } _ { 2 }$D. NO Answer keyB ☆ SaveCan't do it, show the explanation查看原卷 →