题目

In most parts of the world, many students help their schools make less pollution. They join “environment clubs(俱乐部)”. In an environment club, people work together to make our environment clean. Here are some things students often do. No-garbage (垃圾) lunches. How much do you throw away after lunch? Environment clubs ask students to bring their lunches in bags that can be used again. Every week they will choose the classes that make the least garbage and report them to the whole school. No-car day. On a no-car day, nobody comes to school in a car. Not the students and not the下列物质的用途中，主要利用其物理性质的是 A．铜丝做导线   　　　　　　          B．氧气作助燃剂 C．燃烧法鉴别纯毛织物                 D．天然气作清洁燃料