题目

阅读理解Dear Dale, I'm David, and I'm your new penfriend. I'm 12 and I live in Vancouver, a city in Canada. I have short black hair and black eyes. My mother and father are from Beijing, China and we speak Chinese and English at home. My father is a doctor and my mother is a teacher. My sister Amy is 22. She doesn't live at home, because she works in New York, USA. She likes yellow. My brother Jack is at university (大学) and he studies computer science. He is 18 and we live in the same room. We like blue, so the walls (墙) of our room areblue. Please write and tell me about you and you9、空气质量日报的主要内容包括“空气污染指数”、“空气质量级别”、“首要污染物”等．下列物质中，不属于空气污染物的是（　　）A、二氧化硫B、可吸入颗粒物C、一氧化碳D、氮气