选修8 unit 2 教案.docx

选修8 unit 2 教案.docx

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选修8unit2教案

Unit2Cloning

Ｉ．单元教学目标

技能目标Goals

Talkaboutcloning

Practiceexpressingandsupportinganopinion

Usetheappositiveclause

Writeacompositionaboutcloning

Ⅱ.目标语言

功能句式

Expressingandsupportinganopinion

I’mhappytoaccept….But….

Iwouldneveraccept….

I’mnotbotheredabout…..

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，Quagga

3.词组

castdown，objectto，themedia，infavourof，（be）boundto（do）…,fromtimetotime,bringbacktolife,payoff

4．重点词汇

clone，commercial，producer，undertake，arbitrary，object，forbid，accumulatebother，regulation，resist，unable，argument，reasonable，obtain

结构

Appositiveclause—that可引导同位语从句

重点句子

Itisawayof….P11

Thefactisthat….P11

Thequestionthatoccurredis….P12

Howdifferentlydopeoplethinkof….P14

The….is…but…P14

Theadvantageisthat….P15

Howwouldyoutreat….P54

Idon’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

1stperiodReading

2ndperiodListening

3rdperiodSpeaking

4thperiodGrammar

5thperiodExtensivereadingandwriting

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−inthiscasefromafemalegoat’sudder.

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

Beforeclass,askthestudentstosearchforsomei