试题答案：One possible version：Dear teachers and students,Nowadays it’s common to see students wasting things in our school. Many students haven’t realized the importance of energy-saving. For example, Sometimes we can see that lights and computers are still on after class, or some students even leave water running after using it. Besides, Our papers are printed on only one side, causing much waste.It’s time that we did something to avoid this kind of waste. Firstly, make sure that all the lights and other electric facilities are switched off when we leave the rooms. Try to form the habit of turning off the tap immediately after using it. What’s more, papers should be printed on both sides and reused if possible.In a word, if everybody has the awareness of energy-saving and start with ourselves to reduce the waste, we can contribute to our society.Students’ Union
写一篇倡议书，主题：低碳环保、城市建设、生活方式、青少年成长、学校及家庭教育等方面；
