二、说明方法段
　　说明方法段一般出现在方法对策类作文的第二段（偶尔也会出现在第三段，具体根据提纲），其基本的句型构造是：先用一句话引出下文对解决办法、应对措施或决定因素的说明，这是段落的主题句；然后用3-4句话列举2-3点具体的方法、措施或决定因素，以支持主题句；最后再用一句话对前面的方法做出总结（这句话有时可省略）。

　　例
　　Directions : For this part , you are allowed 30 minutes to write a composition on the topic Reduce Waste on Campus . You should write at least 120 words following the outline given below in Chinese :
　　1.目前有些校园内浪费现象严重。
　　2.浪费的危害。
　　3.从我做起，杜绝浪费。

　　第三段：说明方法段
　　(1) Considering the seriousness of the problem , it is an urgent thing for us to take effective measures to eliminate waste on campus . (2) Firstly , we college students must stop wasting water , electricity and food in our daily life . (3) Secondly , we should learn to be economical and try to avoed spending money on something useless . (4) Thirdly , we have responsibility to call on all our schoolmates to fight against waste . (5) Only in this way can waste on campus be eliminated in the near future .