Lesson10:WhatisDNA?一、TeachingAims1.Vocabulary:Masterywordsandexpressions:generally,twin,clone,notonly…butalsoOralwordsandexpressions:blueprint,identical,egg,identify2.Knowhowtowriteapassageonscience.3.LearnsomethingaboutDNA.4.Knowmoreaboutourbody.二、TeachingImportantPoints:1.Masterthewordsandexpressionsofthislesson.2.Theabilityandinability.3.Theuseofcoordinatingconjunctions.三、TeachingDifficultPoints:TheuseofDNA.四、Teachingmethods设定情景来教授重点句型，然后让学生巩固练习。五、Teachingaids录音机、多媒体课件六、TeachingproceduresStep1.LeadinthetextbydiscussingwhatDNAis.Dividetheclassintoseveralgroups.Thentalkaboutthesubjectforseveralminutes.Thenoneofthegroupspresentstheiropinionsinfrontoftheclass.Step2.Listeningtask:Listentothetapeandfillintheblankswiththecorrectwordsyouhear.1.Generallyspeaking,a______isadrawing.2.______foridenticaltwins,eachlivingthinghasitsownuniqueDNA.Playthetapeonce.Thenletthestudentstrytofinishthetaskinclassinoral.Step3.Readingtask:Readthetextquicklyandanswerthefollowingquestions:1.WheredoesyourDNAcomefrom?2.IsyourDNAineverypartofyourbody?Finishthereadingtaskinclassinoral.Trytogetmoreinformationaboutthetextatthesametime.Step4.Readthetextagain.Findthesentenceswiththenewwords.Trytocreatesituationaboutthenewwords.Thenmakesentenceswiththenewwords.Ifsomeonecanmakeawholestorywiththenewwordsthatwelearninthislesson,theteachermustencourageher.Thesentenceswiththenewwords:Generallyspeaking,ablueprintisadrawing.Identicaltwinsaretwochildrenthatgrewfromthesameegg.Theyareclones.FromyourDNA,scientistscanidentifynotonlyyou,butalsopeoplerelatedtoyou.Step5.Letsomestudentstellsomedetailsaboutthetext.WhatisDNA?WhereisyourDNAfrom?WhatisDNAusedfor?Step6.Cometo“LET’SDOIT”.Finishthetaskwithapartner.Findthethingsaboutyouthatshowyourparents’DNA.Talkaboutifforawhile.Thenletsomevolunteerscometothefronttotalkaboutthesubject.Step7.Homework1.Finishofftheexercisesintheactivitybook.2.Goonthenextreadinginthestudentbook.
