when we were in class .we should be positive to answer questions . an active atmosphere can improve our learning enthusiasm and enhance the efficiency of learning. If you became proactive ,you would stimulate classmates around you be positive . but , being positive should have a limit. we should do everything in class in order . being positive doesn't mean we can do whatever we want . we should obey the class's discipline . in this way , we can create a vivid and active class. and everyone will surrounded by positive learning attitude .