本篇书面表达属于应用文，要求考生写一封回信，为笔友Eric介绍旧书回收项目。
【详解】第一步：审题
体裁：应用文
时态：根据提示，时态应主要为一般现在时。
结构：总分法
总分法指把主题句作为总说，把支持句作为分说，并以这种方式安排所写内容。
要求：1.表明写信目的
2.介绍相关情况
1）做法。（what to do）
2）意义。（meaning）
第二步:列提纲 （重点词组）
deal with; carry out; call on; not only…but; awareness of environmental protection; cut down; look forward to
第三步：连词成句
1.I’m writing to answer your questions about our ways to deal with used books.
2.carried out by the Student Union,
3.calls on senior three students to be a green school-leaver.
4.which not only helps deal with their used books properly but promotes their awareness of environmental protection.
5. for it has greatly cut down waste and spread the idea of green life.
6. Looking forward to your reply.
根据提示及关键词（组）进行遣词造句，注意主谓一致和时态问题。
第四步：连句成篇（衔接词）
1.表文章结构顺序：First of all, Firstly/First, Secondly/Second… And then, Finally, In the end, At last
2.表并列补充关系：What is more, Besides, Moreover, Furthermore, In addition As well as, not only…but (also), including,
3.表转折对比关系：However, On the contrary, but, Although+clause(从句), In spite of+n/doing,On the one hand…,On the other hand… Some…,while others…,as for, so…that…
4.表因果关系：Because, As, So, Thus, Therefore, As a result
连句成文，注意使用恰当的连词进行句子之间的衔接与过渡，书写一定要规范清晰，
第五步：润色修改
【点睛】范文内容完整，要点全面，语言规范，语篇连贯，词数适当，上下文意思连贯，符合逻辑关系。作者在范文中使用了较多主从复合句，如：They are encouraged to donate their books by leaving them in the boxes outside their classrooms, which not only helps deal with their used books properly but promotes their awareness of environmental protection.这句话运用了which引导的非限制性定语从句；for引导的原因状语从句Since 2010, the project has been well received, for it has greatly cut down waste and spread the idea of green life.也使用了一些固定词组，如deal with; carry out; cut down等。全文中没有中国式英语的句式，显示了很高的驾驭英语的能力。另外，文章思路清晰、层次分明，上下句转换自然，为文章增色添彩。
苏19057182-3号