(沙塵暴)
1．沙塵暴已成一大禍患；
2．沙塵暴形成的原因；
3．結(jié)論。
[寫作導(dǎo)航]首先描述沙塵暴的嚴(yán)重程度及其危害，如不少城市和鄉(xiāng)村每年都受沙塵暴的襲擊，造財(cái)產(chǎn)損失甚至人員傷亡等；第二段分析造成這一危害的原因，如空氣污染造成溫室效應(yīng)以及水土流失、亂砍濫伐等；第三段結(jié)尾，警告人們吸取大自然給人類的教訓(xùn)，發(fā)展生產(chǎn)的同時(shí)不要忘記環(huán)境保護(hù)。
[范文]
Duststorms are becoming a great concern for both the public and the government in recent years. Every spring overwhelming sands and dust sweep the northern part of China, blocking out the sky, enshrouding cities and villages, bring much inconvenience and problems to people＇s lives and work. In some regions, sandstorms have caused great loss in both people＇s lives and properties.
Duststorms are largely created by man himself. On the one hand, too much air pollution causes a greenhouse effect, which, in turn, leads to global wanning in climate. This results in wet places on the earth even wetter and dry places even drier. On the other hand, over grazing, poor fanning, tree cutting, strip mining all leave theland unprotected. When the wind blows, it blows away topsoil and loose soil. 易優(yōu)作文網(wǎng)名師改作文（http://www.zequeka.cn/jiaoshoulanmu/ ）
Duststorms are another punishment nature gives to mankind. We must be alert to this ecological alarm. We should not only take effective measures to stop duststorms but also draw some lessons from it. We should not "develop" the local economy at the cost of the natural environment.
