Unit21HumanBiologyLesson1ChewingGumTeachingAims:1.Toimprovethereadingabilityofthestudentsandhelpthemstudythestructureofthetextandunderstandthetextwholly.2.Toenrichthestudents’knowledgeabouttheadvantagesanddisadvantagesofchewinggumandencouragethemtotalkabouttheproblemofstudents’chewinggumintheschool.TeachingDifficultiesandEmphasis:1.Helpthestudentstofindmoreadvantagesanddisadvantagesofchewinggum.2.Helpthestudentstocarryoutthediscussion.Teachingmethods:1.Task-basedteaching.2.Individualandgroupwork;Discussing.TeachingAids:ComputerandworksheetsTeachingProcedures:Step1:Leading-in1.ShowthepictureofaNBAstar(MichealJordan).1)Whoistheman?2)Whatisthemaneating?Step2:Reading1.Doyoulikechewinggum?2.Isitgoodorbadforourhealth?-----Tochewornottochew3.Listentothetapecarefullyanddividethetextintoseveralparts.Part1(para1):introductionPart2(para2-4):theadvantagesofchewinggumPart3(para5-7):thedisadvantagesofchewinggumPart4(para8):conclusion4.Findtheadvantagesanddisadvantagesofchewingguminthetext.用心爱心专心AdvantagesDisadvantages1.helpingpeoplefightbadbreath2.helpingpeoplestoptoothdecay3.helpingpeopleloseweight4.helpingsmokersgiveupsmoking1.makingdigestionmoredifficult2.causingfeelingsofsicknessorheadaches3.leadingtostomachsickness4.makingpeopleneglectbrushingtheirteeth5.Findmoreadvantagesanddisadvantagesofchewinggum(showsomepicturesorvideos).6.Decideifthefollowingstatementsaretrueorfalse.1).Dietspecialistsseldominformusthatitisimportanttochewourfoodproperly.(F)2).Chewinggumcannotfightbadbreath.(F)3).Ifyouhadchewedsugar-freegumregularlyfortwoyears,youwouldhavelostupto5kilos.(F)4).Ifpeoplechewed50timesperminutefor24minutes,70kilocalorieswereburned.(T)5).Chewinggumcanhelpsmokersgiveuptheirbadhabitmoresuccessfully.(T)6).Whenwechewgum,itwillnotcauseourbodiestoproducedigestivesjuices.(F)7).Chewinggumforlongperiodsoftimewillmakeourstomachbecometense.(T)8).Chewingsugar-freegummustcausethenumberofyoungpeoplewithbadteethtorise.(F)9).Onbalance,itwouldbebettertochewgum.(F)7.Fillintheblankswiththeproperwordswhichareinthetext.Ononehand,chewinggumcanfightbadbreath.Somedentistsbelievethatsugar-freegumhelpstostoptoothdecay.Gumcontrolspeople’sappetitesoitcanhelppeopletoloseweight.Gumcanalsocontainmedicine.Ithelpssmokersgiveuptheirbadhabitsuccessfully.Ontheotherhand,chewinggumhasitsnegativeside.Dietspecialistssaychewingstartstheproductionofstomachacidanddigestivejuices.Itwillmakedigestionmoredifficultandmaycausefeelingsofsicknessorevenheadaches.Further,chewinggumforlongperiodsoftimemayleadtostomachsickness.Onbalance,we’dbetterforgetchewinggum,eathealthyfoodsandneverstartsmoking.Sothatwecanliveahealthylife.8.ShowthepictureaboutthepollutionintheTiananmenSquareonNationalDays.1).Whereisit?2).Whataretheydoing?9.Introducesomethingaboutthenews用心爱心专心Step3:DiscussionNowadaysmanystudentslikechewinggumintheschool.Somestudentschewgumafteramealtogetagoodsmell.However,somechewgumintheclassorevenwhentheyarehavingatestthenthrowitanywhere.Doyouthinkitrightforusstudentstochewgumintheschool?Giveyourreasons.Step4:HomeworkWriteanarticleaboutyourdiscussion:Doyouthinkitrightforusstudentstochewgumintheschool?用心爱心专心
