One possible version:

As we all know, when senior students graduate from school, most of their reference books are thrown away, which are still in good condition. What great waste it is, so I suggest that we should recycle the books. On the one hand, recycling them can save a lot of natural resources, which are used to make textbooks. On the other hand, senior students may have made plenty of useful notes on the pages that are very useful to the following users. In fact, in Australia and some other countries, recycling reference books is popular, which gives us a good example, so I think it is meaningful for us to build an energy-saving society.

题目分析：本文属于提纲类作文。要点都已经给了出来，所写的话题也是考生所熟悉的。写作时注意准确运用时态，上下文意思连贯，符合逻辑关系，尽量使用自己熟悉的单词句式，同时也要注意使用高级词汇和高级句型使文章显得更有档次。特别注意在选择句式时要赋予变化。

点评：本文属于提纲类作文，关键在于要点要全面包括在内。审题时一定要认真分析要点，理解要点要表达的含义，不能遗漏要点，跑题偏题。平时除了加强词汇积累，写作联系以外，还可以适当记忆一些类似的范文，这样在考试中可以起到事半功倍的效果。