此资料由网络收集而来，如有侵权请告知上传者立即删除。资料共分享，我们负责传递知识。三分钟优秀演讲稿五篇下面是小编整理的三分钟优秀演讲稿，欢迎大家阅读参考。三分钟优秀演讲稿篇一smokingisagreatercauseofdeathanddisabilitythananysingledisease,saystheworldhealthorganisation.accordingtotheirfigures,itisresponsibleforapproximatelyfivemilliondeathsworldwideeveryyear.tobaccosmokingisaknownorprobablecauseofapproximately25diseases,andeventhewhosaysthatitsimpactonworldhealthisnotfullyassessed.heartattackandstrokeukstudiesshowthatsmokersintheir30sand40sarefivetimesmorelikelytohaveaheartattackthannon-smokers.tobaccocontributestothehardeningofthearteries,whichcanthenbecomeblockedandstarvetheheartofbloodflow,causingtheattack.often,smokerswhodevelopthiswillrequirecomplexandriskyheartbypasssurgery.ifyousmokeforalifetime,thereisa50%chancethatyoureventualdeathwillbesmoking-related-halfofallthesedeathswillbeinmiddleage.smokingalsoincreasestheriskofhavingastroke.lungproblemsanotherprimaryhealthriskassociatedwithsmokingarelungcancer,whichkillsmorethan20,000peopleintheukeveryyear.usstudieshaveshownthatmenwhosmokeincreasetheirchancesofdyingfromthediseasebymorethan22times.womenwhosmokeincreasethisriskbynearly12times.此资料由网络收集而来，如有侵权请告知上传者立即删除。资料共分享，我们负责传递知识。lungcancerisadifficultcancertotreat-longtermsurvivalratesarepoor.smokingalsoincreasestheriskoforal,uterine,liver,kidney,bladder,stomach,andcervicalcancers,andleukaemia.anotherhealthproblemassociatedwithtobaccoisemphysema,which,whencombinedwithchronicbronchitis,produceschronicobstructivepulmonarydisease.三分钟优秀演讲稿篇二ladiesandgentlemen,ihavehadalotofteachersinmyschoolwhohavegivenmemuchhelpinmystudy.fortheirhelpiwillneverforgetthem.buttodayiamgoingtotalkaboutaspecialteacherofmine.thisteacherisnotahumanbeinganditsnameis”;computer”;.ithasbeenteachingmealotofknowledgeandiappreciateitverymuch.withthedevelopmentofmodernscienceandtechnology,computersarewidelyusedineveryteritories(1)includingeducation.howcanacomputerbemyteacher?howdoesacomputerteachme?multimedia(多媒体)helpsalotinthisaspectinrecentyears,andcomputer-basedtraining(cbt)hasbecomeapopulareducationalmedium(手段).evenbeforethemultimediacome(2)up,manydifferentlearningsystemsappeared,usingthecomponentsandtechniqueswenowassociatewiththeterm“;multimedia”;.multimediacomponents,suchasgraphics(动画),animations,soundandvideo,makethelearningprocesseasierthroughvisualization.animationscanpresentmanycomplexsubjectsdynamically,buthumanteacherscannotdothisonblackboards.multimediamakesourstudymorelivelyandinteresting.forexample,acd-romdisknamed“;encartaencyclopedia”;contains650mbinformationincludingimages,graphics,musicclips,videoclips,此资料由网络收集而来，如有侵权请告知上传者立即删除。资料共分享，我们负责传递知识。animations,texts,hotwords,anddatabasesearchfunctions.fieldsinvolvedincludesphysicalsciences,performancearts,socialsciences,politics,military,educationandsoon.whenpressingabutton,icanhearamericanpresidentclinton'sspeechclip.imayenjoyplayingallkindsofmusicalinstrumentsintheworld.icanalsoseetheanimationofmanyphysicalphenomena.thismakesphysicalconcepttobeunderstooddeeply(3).theaudiofeaturesofmultimediacangreatlyhelpmelearning(4)foreignlanguages.withitsspeechoutputcapabilities,i'mnolongerdependentonaninstructorforproperpronunciation.howcanii...
