高一英语 Unit16《Scientists at work第三课时》精品教案 旧人教版第一册VIP免费

TheThirdPeriodTeachingAims:1.Reviewthewordslearntinthelastperiodandlearntheirdifferentmeaningsbyheart.2.Learntoguessthemeaningofcompounds.3.Learntodescribethetwopartsofsomecompounds.TeachingImportantPoints:1.Learnandmasterthedifferentmeaningsofsomeverbs.2.Learntoguessthemeaningofcompoundsandlearntodescribesomecompounds.TeachingDifficultPoints:1.Howtodescribethetwopartsofsomecompounds.2.Howtoguessthemeaningofthecompounds.TeachingMethods:1.Reviewmethodtoconsolidatewhatwe'velearnt.2.Practicetomakethestudentslearnthewayofguessingcompoundsanddescribingthem.3.Individual,pairorgroupworktomakeeverystudentworkinclass.TeachingAids:1.aslideprojector2.acomputerformultimediauseTeachingProcedures:StepⅠ.GreetingsGreetthewholeclassasusual.StepⅡ.RevisionT:InthelastperiodwelearntapassageaboutFranklin'sfamouskiteexperiment.NowI'llaskoneortwostudentstoretelltheexperiment.Who'dliketo?S1:I'lltry.InJune1752,Franklinwantedtoshowthatlightningandelectricitywerethesame.Hedecidedtodoanexperimentusingakite,sohebuiltastrongkiteofsilk.Whenthefirstthunderstormcame,withhisson'shelp,hetookhiscondensertoashedinthefieldsandflewthekitehigh.Itbegantorain,butnothinghappened.whentheywerewaitingintherain,hesawsomehairsonthestringstoodup.Thestringwasgettingcharged.Hebroughthisfingerclosetothekeyandfeltalightbutveryclearelectricshock.Thatexperimentsucceededandprovedthatlightningandelectricitywerethesame.T:Verygood.NowI'llaskanotherstudenttodescribeanexperimentdonebefore.Anyvolunteers?S2:LastyearIdidanexperimentaboutthecharacterofrootsgrowingtowardswater.Letmedescribeit.Iwantedtoshowtherootsofplantsgrowtowardsthedirectionoftheplacewithwater.IthoughtmuchandIfoundthebestwaytoproveit.First,Ifoundtwopotswiththesamesoilandplantsineachofthem.ImarkedthemwithNo.1andNo.2oneachpot.TheninNo.2potIdugaholewhich用心爱心专心1wasacertaindistancefromtheplant.Iputsomewateraroundtheplantinthefirstpotbutsomewaterintotheholeoftheother.Somedayslater,Itookthemoutofthesoil.Tomysurprise,therootsoftheplantinNo.1growasusual,whiletherootsoftheotherplantgrowtowardsthehole.Itprovedthattherootsofplantsgrowtowardsthedirectionoftheplacewithwater.StepⅢ.WordStudyT:Inthepassagelearntyesterdaywelearnedsomeimportantwords,suchas,charge,conduct,cross,sharp,tear,tieandsoon.Pleasefindoutthesentencesincludingthewordsfromthepassage.(Teacherasksstudentstoreadthesentencesandshowsthemonthescreen.)1.BenjaminFranklinconductedanumberofexperimentinwhichheshowedwhatelectricityis.2.Thestringwasgettingcharged.3.Buildtheframeofthekitebymakingasmallcrossoftwopiecesoflightwood.4.Addatailtotheframeandtiealongstringtothecrosssoyoucancontrolthekite.5.First,fixaverysharppieceofmetal,pointingafootormoreabovetheframetothetopofthelongestofstickofthecross.T:PleaselookatthesentencesandputthemintoChinese.Meanwhile,tellmethemeaningsoftheunderlinedwords.Suggestedanswers:1.conductvt.指导；进行富兰克林做了许多实验，在这些实验中他证实了电是什么。2.chargevt.充电我看见风筝线上的纤维直立起来，这根线有电了。3.crossn.十字形用两根木条绑了个十字形的框架。4.tievt.系往框架上加一个尾巴并且把一根长绳系到十字形的框架上，以便你能控制这个风筝。5.sharpadj.尖的首先，把一根尖尖的金属固定在框架中最长的木条上，并且要超出框架一英尺左右。T:Verygood.NowopenyourbooksandturntoPage19.Let'sdoWordStudy.Inthispart,we'lllearntheusagesofsomewords.Foreachword,therearethreeexamplesandthreemeanings.Inoneofthesent...