高二年级关于世界无烟日的英语作文.doc

高二年级关于世界无烟日的英语作文 Smokehassomethingforpeopleinpoorhealth,nicotine. Nicotineinacigarettecankillamouse,25gofnicotineincigarettescankillafewcows,40to60mgofpurenicotinecankillaperson. Thedangersofnicotineisalsoquitebig,itcancausestomachorotherstomachdisease;Alsocanmakethepersoncausesheartdiseasecauserhythmoftheheartisnotstraight;Theoutbreakofseriousstillcancausecancer. Cigarettesarehiddenintheinvisiblekiller,aroundusareallshouldbevigilant. Accordingtoscientists,thechemicalpositionoftobaccocontainshundredsofplex,mostharmfultohumanbody,includingtar,nicotine,phenols,alcohols,acids,aldehydeis40kindsoftoxicandcarcinogenicsubstance.Smokeafterthefire,smoke,containsthechemicalpositionoftobaccoinall,atthesametimethanthetobaccoitselfandaddedsomeharmfulsubstances,suchascarbonmonoxide,tobaccotarandsoon.Thisisbecauseinadditiontothetobaccoitself,intheprocessofcigarettemade,toaddsomecocoainrawmaterials,liquorice,sugar,glycerin,suchasethyleneglycol,moist,tastefragranceandbustionsupportingmaterial.Althoughtheseadditiveitselfisharmless,butchangedintheprocessofbustion.Forexample,inthebackoftheratwithcocoaafterburningsmokeoil,cangrowskintumor.Glycyrrhizicacidinglycyrrhizaafterburning,withotheringredients,cangeneratehavecarcinogenicpolycyclicaromatichydrocarbons.Sugarincreasedafterbustionwithtobaccotar,andtheproductofsugarafterbustionisanimportantcarcinogensintobacco.Glycerinandglycolaftertheburningofthematerial,notonlycanmakesmokersbladdercancer,andtheacroleininhibitsthetracheaandciliasecretionfromthelungs,therebyincreasethechancesofsufferingfrombronchitisandemphysema,andmakepeoplewithbothbecameseriouslyill. SmokeharmtopeopleishowgreatSowecantsmoke.Stopsmoking,thebenefitoffuturegenerations. 烟里有一种对人身体不好的东西尼古丁 一枝香烟中的尼古丁可以毒死一只小白鼠25g的香烟里的尼古丁可毒死几头牛40至60毫克纯尼古丁可以毒死一个人 尼古丁的危害也是相当的大它可以引起胃痛或其它胃病;还会使人引起心律不正诱发心脏病;严重的还可能引起癌症的爆发 香烟是隐藏在我们身边的隐形杀手是大家所应警惕的 据科学家测定烟草中含有数百种复杂的化学成分大部分对人体有害其中焦油、尼古丁、酚类、醇类、酸类、醛类等40种是有毒和有致癌作用的物质烟在点燃后所产生的烟雾包含了烟草中所有的化学成分同时比烟草本身又增加了一些有害物质如一氧化碳和烟焦油等这是因为除烟草本身外在制成卷烟的过程中要在原料中加入一些可可、甘草、糖、甘油、乙二醇等调味、湿润、产香、助燃物质这些添加剂虽然本身无害但在燃烧过程中却起了变化例如在鼠背涂上可可燃烧后产生的烟油可长出皮肤瘤甘草中的甘草酸在燃烧后与其他成分化合可生成有致癌作用的多环芳烃糖与烟草一起燃烧后增加了焦油量而糖燃烧后的产物是烟中的一个重要