高二英语选修8unit2教案.docx
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高二英语选修8unit2教案
Unit2Cloning
Ｉ．单元教学目标
技能目标GoalsTalkaboutcloning
PracticeexpressingandsupportinganopinionUsetheappositiveclause
Writeacompositionaboutcloning
Ⅱ.目标语言
功能句式
ExpressingandsupportinganopinionI'mhappytoaccept⋯.But⋯.
Iwouldneveraccept⋯.
I'mnotbotheredabou⋯t..
Idon'tmindbut⋯.
Ihopeyou'llcarryon⋯.
Areyousureyouwantto⋯.
Iagreewithyouthat⋯.
Isitfairto⋯.?
Doyouthinkitiswiseto⋯.?
Ithinkyoushould⋯.
Welldonetoyoufor⋯.
Idon'tunderstandwhyyoudon't⋯.
Ican'thelpthinking⋯.
Icouldneveragreeto⋯.
词汇
1.四会词汇
Strawberry，differ，exact，straightforward，breakthrough，disturbing，cast，altogether，objection，media，moral，ceiling，shortly，retire，assumption，merely，decoration，zebra，aloud
2.认读词汇identical，nucleus，gene，somatic，embryo，fate，impact，extinct，popularity，
Jurassic，bison，calf，DNA，habitat，restore，Auroch，GreatAuk，Quagga3.词组castdown，objectto，themedia，infavourof，（be）boundto（do）⋯,fromtimetotime,bringbacktolife,payoff4．重点词汇
clone，commercial，producer，undertake，accumulatebother，regulation，resist，unaobtain
arbitrary，object，forbid，ble，argument，reasonable，
结构
Appositiveclause—that可引导同位语从句
Itisawayof⋯.P11
Thefactisthat⋯.P11
重
点
Thequestionthatoccurredis⋯.P12
Howdifferentlydopeoplethinkof⋯.P14
句
子
The⋯.is⋯but⋯P14
Theadvantageistha⋯t.P15Howwouldyoutreat⋯.P54Idon'tmindbut⋯.P55
Iagreewithyouthat⋯.P55
III.教材分析与教材重组
1.教材分析
本单元以Cloning为话题，旨在通过单元教学，使学生了解克隆技术的优缺点，学会表达和支持个人观点，能用所学的有关Cloning的词汇去表述自己对这一新技术的观点和看法。
1.1WarmingUp提供了四幅有关Dollythesheep（多莉羊）Astrawberryplant（草莓植物）Twins（双胞胎婴儿）Identicaldogs（克隆狗）的图片，让学生用已有的知识和经验讨论对克隆技术的看法与观点。
1.2Listening是关于人类克隆的听力材料，难度中等。
1.3Speaking根据材料，四人小组合作，要求把自己对克隆婴儿的态度和感
觉用相关的语言表达出来。
语言要得体，锻炼语段表达能力
1.4Pre-reading是Reading的热身活动。
它要求采用与同学讨论交流的方式谈论有关克隆的相关知识。
1.5Reading是一篇介绍克隆技术的说明文。
1.6Comprehending第一题所给出的表格让学生根据课文内容列举克隆技术的优缺点。
第二题让学生根据所拥有的知识来评价作者的观点。
第三题要求学生用自己的语言阐述对克隆技术的观点并给出理由。
1.7LearningaboutLanguage分词汇和语法两部分，其中Discoveringusefulwordsandexpressions是根据语境在运用中掌握词汇。
Discoveringusefulstructures是通过阅读和补全句子来练习。
1.8UsingLanguage中的Reading，Discussingandwriting要求学生先读,然后完成四个任务型的作业。
即1.讨论并回答三个问题。
回答这些问题，2.讨论几种已经灭绝的动物，并且讨论哪种动物应该被恢复到这个世界上，并且给出理由。
3.listeningandspeaking让学生根据所听到的内容选择并列出文中人物观点。
2.教材重组
2.1从话题内容上分析，WarmingUp与Reading相一致；而从训练目的上分析与TALKING比较一致。
从教材份量来说，可将WarmingUp和Reading整合在一起，设计成一节任务型“阅读课
（一）（精读课）”。
2.2将Listening和Workbook中的LISTENING整合在一起，设计成一节"听力课"。
2.3将UsingLanguage与Workbook中的TALKING和SPEAKINGTASK结合在一起，设计成一节“口语课”
2.4将LearningaboutLanguage与Workbook中的USINGWORDSANDEXPRESSION整合在一起上一节“语法课”。
2.5将Workbook中的READINGTASK和PROJECT以及WRITINGTASK整合成一节“泛读与写作课”。
3.课型设计与课时分配
1st
period
Reading
2nd
period
Listening
3rd
period
Speaking
4th
period
Grammar
Ⅳ.分课时教案
TheFirstPeriodReading
Teachinggoals教学目标
1.Targetlanguage目标语言
a.重点词汇和短语clone，commercial，producer，undertake，arbitrary，object，forbid，accumulate，castdown，objectto，themedia，infavourof
b.重点句子
Itisawayof⋯.
Thefactisthat⋯.
Thequestionthatoccurredis⋯.
2.Abilitygoals能力目标
Enablethestudentstodescribecloning:
Whatistheadvantagesofcloning？
Whatistheproblemsordangersofcloning？
Whatisyouropinionofcloning？
3.Learningabilitygoals学能目标
Helpthestudentslearnhowtodescribecloning.
Teachingimportantpoints教学重点
Howtodescribecloning.
Teachingdifficultpoint教学难点
Helpthestudentsanalyzethewritingtechniquesofthearticle.
Teachingmethods教学方法
Skimming,task-basedmethodanddebatemethod.
Teachingaids教具准备
Arecorder,aprojectorandsomeslides.
Teachingprocedures&ways教学过程与方式
StepILead-in
Thistopicisdifficultforstudents.Soteachershouldhelpthestudentslearnmoreaboutit.Dothisinthewayofaskingandansweringquestions.
T:
Youcanimaginehowrapidlythemodernscienceandtechnologydevelop.Ithinkmostofyoumustknowsomethingaboutspacetraveling,submarineexploration,robot,maglevtrain,geneengineeringetc.Butinrecentyears,ahottopic,cloningisoftenmentioned,especiallywhenthecloningDollythesheepappeared.YoumayhavefirstheardofcloningwhenDollytheSheepshoweduponthescenein1997.CloningtechnologieshavebeenaroundformuchlongerthanDolly,though.Firstthingsfirst,whatiscloningandaclone?
Thedictionarysayscloningisthetechniqueofproducingageneticallyidenticalduplicateofanorganism.Acloneissaidtobealldescendantsderivedasexuallyfromasingleindividual,asbycuttings,bulbs,byfission,bymitosis,orbyparthenogenesisreproduction.Itsoundsverydifferentandcomplicatedtous.Infact,Imean,inourdailylife,thishappensoften.Forexample,gardenerstakecuttingsfromgrowingplantstomakenewones.Youoftenseethatyourmotherpicksasmallbranchfromagrowingplanttomakeanewone.Ifshelikesthiskindofflowers,shecandocloning.Cloningalsohappensinanimalsorhumanbeingswhentwinsidenticalinsexandappearanceareproducedfromthesameoriginalegg.Thefactisthatcloningplantsisstraightforwardbutthecloningofanimalsismorecomplicated.Thepossibilityofhumancloning,raisedwhenScottishscientistsatRoslinInstitutecreatedthemuch-celebratedsheep"Dolly",arousedworldwideinterestandconcernbecauseofitsscientificandethicalimplications.Youcangiveyourquestionsifyouareinterestedinthistopic.Iamheretodayoneofthescientistswhoworkinthisfield.Iamreadytoansweranyofyourquestions.
S:
Nowweknowwhatiscloning.Aretheredifferenttypesofcloning?
T:
Whenthemediareportoncloninginthenews,theyareusuallytalkingaboutonlyonetypecalledreproductivecloning.Therearedifferenttypesofcloninghowever,andcloningtechnologiescanbeusedforotherpurposesbesidesproducingthegenetictwinofanotherorganism.Abasicunderstandingofthedifferenttypesofcloningiskeytotakinganinformedstanceoncurrentpublicpolicyissuesandmakingthebestpossiblepersonaldecisions.Thefollowingthreetypesofcloningtechnologieswillbediscussed:
（1）recombinantDNAtechnologyorDNAcloning,
（2）reproductivecloning,and（3）therapeuticcloning.
S:
WasDollycreatedbywhatcloning?
AndwhywasDollysoimportant?
T:
ReproductivecloningisatechnologyusedtogenerateananimalthathasthesamenuclearDNAasanothercurrentlyorpreviouslyexistinganimal.Dollywascreatedbyreproductivecloningtechnology.ShewasthefirstmammaltobeclonedfromadultDNAtakenfromanadultcell.Previously,animalshadonlybeenclonedusingembryocellswhichalreadyhavethepotentialtobecomeacompleteembryoinitsownright.ThebigbreakthroughwithDollywastomakeaclonefromanordinary,adultcell-inthiscasefromafemalegoa'tsudder.
S:
HaveyouseenJurassicPark?
Inthisfeaturefilm,scientistsuseDNApreservedfortensofmillionsofyearstoclonedinosaurs.Theyfindtrouble,however,whentheyrealizethattheclonedcreaturesaresmarterandfiercerthanexpected.Couldwereallyclonedinosaurs.
T:
Intheory?
Yes.Whatwouldyouneedtodothis?
Awell-preservedsourceofDNAfromtheextinctdinosaur,andacouldserveasasurrogatemother.Inreality?
Probablynot.It'snotlikelythatdinosaurDNAcouldsurviveundamagedforsuchalongtime.However,scientistshavetriedtoclonespeciesthatbecameextinctmorerecently,usingDNAfromwell-preservedtissuesamples.
Morequestionsaboutcloningaregivenintheappendix.Theinformationaboveisforreferenceonly.Oryoucanchooseseveralstudentsandaskthemtoactoutashortplaywhosemaintopicisasfollows:
Anoldmanwhowasdyingleftallhisfortunetohisownson.Butthedidnotknowthathissonwascloned.Sotwosameyoungmenbothclaimedthattheyweretheoldman'sson.Theyquarreledandfoughtwitheachother;atlasttheywenttothejudge.ThejudgeletthemcheckDNA.TheresultwasthattheirDNAwasthesame.Noweventhejudgedidnotknowwhattodo.
Inthisparttheteachercangivethestudentssomeadvicetoactout.Accordingtothisplayteacheraskthestudentsseveralquestions:
1.Doyouwanttobeclonedornot?
Why?
2.Ifyouarethejudgewhatwillyoudo?
3.Canyoutellmetheadvantagesofcloning?
4.Andwhatisthedisadvantage?
Discussion
Inthispartthestudentswilldiscusstherelationshipbetweenthedevelopmentoftechnologyandsocialcustoms.
T:
Asthetechnologydevelopsdaybyday,ithasamoreandmoreimportantinfluenceonthewholesociety.Technologyaffectssocialcustomsandethics,sometimestechnologymaygoagainsttheconventionalthinking,thencomestheproblemthatwhetherweshouldstopthedevelopmentofresearchorchangetheethics.
S1:
Astechnologydevelopsinalmosteveryfield,alotofouroriginalcustomsandethicschanged,eitherbecausetheyareoutoftimeornotsoscientific.Forexamplemillionsofyearsagohumanatemeatofanimalswithoutheatingthem.Laterpeopleusedfireandnolongeraterawmeatandtheyalsousedfiretoscaredangerousanimals.
S2:
Ithinkwecouldnotstopthedevelopmentoftechnology,foritmaydevelopinthewaywhichisacceptablebysocialcustoms.
Lookatpictures
T:
Lookatthepicturesanddiscusswhichonesarenaturalclonesandwhichonesareman–made.Thenexplainhowtheydiffer.
S:
IthinkthetwinsarenaturalclonesandtheDollysheepisman-made.
T:
Youareright!
Canyouexplainhowtheydiffer?
S:
Thetwinswerebornatthesametime,buttheDollysheepisman-made.
T:
Anythingelse?
Whowanthaveatry?
S:
Ithinktheidenticaldogisman-made.
T:
GoodJob
StepIIPre-reading
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