焚烧树叶对人有害
【内容提示】
根据内容提示写一篇提醒人们不要焚烧树叶的文章，说明焚烧树叶产生的烟雾，会污染环境，有害于人们的身体健康。
内容梗概：
前几天你去火车站给朋友送行，路上看到清洁工人正在烧树叶，你由此联想到老师曾讲过树叶燃烧的烟尘会对大气造成污染，并直接影响人体健康，导致癌症。你在文中呼吁人们不要烧树叶。
【作文示范】
Burning Is Harmful to Popl
A fw days ago, I wnt to th railway station to s my frind off. On th way I saw strt-clanrs burning dry lavs. What thy do is wrong.
Burning things dos harm to popl. I rmmbrd that our tachrs onc told us that burning dry lavs would giv off smok and dust which in turn pollut air. And what is mor, it would b harmful to popl's halth. Whn popl brath th air with smok, th smok might lad to cancr. As a rsult, th cancr would caus popl to di.
As w all know, lavs can mak vry good frtilizr. It would b bttr to collct thm for th filds.
【词语解释】
frtilizr['f+:tilaiz+] n．肥料
【写法指要】
本文分析焚烧树叶的害处。引言段最后一句是全文的篇题。扩充段第一句是主题句，下面分析说：人燃烧树叶，树叶产生烟尘，烟尘污染空气，空气被人吸入，人得癌症，癌症致人死亡。这样就构成了一种因果链。所以我们说，本文是因果链分析说明文。结尾段中，作者提出自己的建议。
