因果鏈分析說明:焚燒樹葉對人有害-Burning Is Harmful to P.
焚燒樹葉對人有害
【內容提示】
根據內容提示寫一篇提醒人們不要焚燒樹葉的文章，說明焚燒樹葉產生的煙霧，會污染環(huán)境，有害于人們的身體健康。
內容梗概：
前幾天你去火車站給朋友送行，路上看到清潔工人正在燒樹葉，你由此聯(lián)想到老師曾講過樹葉燃燒的煙塵會對大氣造成污染，并直接影響人體健康，導致癌癥。你在文中呼吁人們不要燒樹葉。
【作文示范】
Burning Is Harmful to People
A few days ago, I went to the railway station to see my friend off. On the way I saw street-cleaners burning dry leaves. What they do is wrong.
Burning things does harm to people. I remembered that our teachers once told us that burning dry leaves would give off smoke and dust which in turn pollute air. And what is more, it would be harmful to people＇s health. When people breathe the air with smoke, the smoke might lead to cancer. As a result, the cancer would cause people to die.
As we all know, leaves can make very good fertilizer. It would be better to collect them for the fields.
【詞語解釋】
fertilizer[＇f+:tilaiz+] n.肥料
【寫法指要】
本文分析焚燒樹葉的害處。引言段最后一句是全文的篇題。擴充段第一句是主題句，下面分析說：人燃燒樹葉，樹葉產生煙塵，煙塵污染空氣，空氣被人吸入，人得癌癥，癌癥致人死亡。這樣就構成了一種因果鏈。所以我們說，本文是因果鏈分析說明文。結尾段中，作者提出自己的建議。[/U]