题目

阅读理解。 All over the world, people enjoy sports. Sports are good for people’s health. Many people like to watch others play games. They buy tickets or turn on their TV sets or may be online to watch. Sports change with the seasons. People play different games in different seasons. Sometimes they play inside the room. Sometimes they play outside. We can find sports here and there. Some sports are rather interesting and people everywhere like them. Football, for example, is very popular in the world. People from different countries cannot understand each other, but after a game下列物质中属于纯净物的是（　　） A、河水B、乙醇汽油C、氧气D、加铁酱油