書面表達練習近年來，城市空氣污染越來越嚴重，各大城市相繼出現(xiàn)了霧霾天氣（hazyweather），請根據(jù)下列內(nèi)容要點提示，寫一篇關于保護環(huán)境的文章。內(nèi)容要點：1.霧霾成因：①汽車使用增加；②工廠污染嚴重；③樹林大量砍伐2.建議辦法：①盡量少用私家車，選用公共交通工具、步行或騎自行車；②(自擬1—2條)寫作要求：1.詞數(shù)80左右；2.短文必須包含所有要點，可適當發(fā)揮。Theseyears,airpollutionisgettingworseandworseinbigcities._____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ 參考范文Theseyears,airpollutionisgettingworseandworseinbigcities.Nowcarsareincreasingveryfast.Factoriesarecontinuingpollutingtheair.Treesarebeingcutdown.Sothehazyweatherisbecomingmoreandmoreserious.It’stimeforustodosomethingtoprotecttheenvironment.Firstofall,we’dbetternottravelbycarunlessit’snecessary.Wecantakethebusorthesubway,walkorrideabikeifwedon’tgofaraway.Wecanalsosetupavolunteerclubandaskmorepeopletojoinit.Wecanplantmoretrees,givethegovernmentadvicetostopthefactoriespollutingtheairandwater.Inaword,protectingtheenvironmentistoprotectourselves.It’sourdutytoprotectourenvironment.