必修3 unit4 全单元教案

Unit4Astronomy:thescienceofthestarsTheMiddleSchoolattachedtoHubei主写人:汪慧主审人：夏青林aimsanddemands课题：Unit4Festivalsaroundtheworld课程目标知识与能力HelpSslearnaboutscienceofthestars.GetSstousethewordsandexpressionsaboutlifespace.HelpSslearnabouttheusageofnounclauses.过程与方法TrainSsspeakingabilityviatheindividualperformances.TrainSsknowtheusageofnounclausesbyreadingpassage.情感态度与价值观Sscanknowmoreaboutthedevelopmentoflifespace.重点Improvingthestudents’oralabilitybytakingaboutlifespace.难点HowtohelpSsimprovetheirspeakingandreadingability.HowtohelpSstodescribelifespace.LeadSstotalkinclassactively.Theusageofnounclauses.教法Task-basedApproach学法Cooperation手段Ataperecorder,CAI,AblackboardTheFirstPeriodIntensiveReadingTeachinggoals教学目标1.Targetlanguage目标语言重点词语：theory,atom,billion,globe,violent,carbon,atmosphere,fundamental,harmful,acid,multiply,oxygen,exist,prevent,dioxide2.Abilitygoals能力目标a.EnableSstotalkaboutthescienceofthestars,thedevelopmentoflifeandspacetravelandgravity.b.Understandthetextandanswerthefollowingquestions:c.EnabletheSstounderstandthedetailsaboutthepassage,d.Retellthepassageusingkeysentences.3.Learningabilitygoals学能目标EnableSstolearnhowtotalkaboutthebeginningoflifeontheearth.Teachingimportantpoints教学重点a.Talkaboutthebeginningoflifeontheearth.Whydidanimalsfirstappearintheseas?Whydidgreenplantshelplifetodevelop?b.Discusstheorderofdevelopmentoflife.Teachingdifficultpoints教学难点a.Understandthebeginningoflifeontheearth.b.Discussthequestions:Whatwillourfuturebeiftheearthmaybecometoohotforthelivesonit?Whyarehumansthecleverestanimalsontheearth?Teachingmethods教学方法a.Skimmingandscanning.b.Asking-and-answeringactivitytochecktheSs’understandingofthetext.c.Individual,pairorgroupworktofinisheachtask.d.Discussion.Teachingaids教具准备Arecorder,acomputerandaprojector.Teachingprocedures&ways教学过程与方式StepIPresentationT:Hello,everyone!Todaywe’llcometoUnit4Astronomy.BeforethatIhaveaquestion:Wheredowecomefrom?Orwecansay:Whoareourancestors?T:Doyouwanttogetmoreinformation?Todaywe’lllearnsomethingaboutHowLifeBeganontheEarth.TurntoPage25.Let’scometoWarmingupfirst.StepIIWarmingup1.Readthethreequestions,whilethestudentslistenandfollow.2.GivetheSsseveralminutestodiscussthequestions.3.Collectanswersfromthewholeclass.4.Checktheanswerswhilediscussing.StepⅢPre-readingGettheSstodiscussthequestionsonPage25withtheirpartners.ThenasktheSstotelltheirstories.EncouragetheSstotelldifferentstories.Iftheydon’tknowany,tellthemsome. StepⅣReadingReadthepassagecarefullyandanalyseitsstructure.Writedownthemainideaforeachparagraph.:AwidelyacceptedtheoryabouttheformationoftheuniversePara2:Theformationoftheearth:Theimportanceofwaterforlife:Thedevelopmentofplantsandanimalsontheearth:ThearrivalofhumansandtheirimpactontheearthReadingandanswerthequestions.1.Whywastheearthdifferentfromotherplanets?Thewaterremained.2.Whywaslifeabletodevelopontheearthbutnotonotherplanets?Thewaterstayedontheearthbutnotonotherplanets.3.Whywasitnecessaryforplantstogrowbeforeanimals?Plantsprovidedoxygenforanimalstobreathe.4.Whatproblemiscausedbyhumanbeings?Theycauseglobalwarming.5.Whyisitwronginfilmsandstoriestoshowdinosaursandpeopletogether?Becausedinosaursdiedoutlongbeforehumanbeingsdevelopedontheearth.6.Whydoyouthinkthathumansarethecleverestanimalsontheearth?Theyarethecleverestanimalsbecausetheyhavelargerbrainsthananyothercreatureontheearthsofar.7.Whyisitwronginfilmsandstoriestoshowdinosaursandpeopletogether?Becausedinosaursdiedoutlongbeforehumanbeingsdevelopedontheearth.8.Thereusedtobenineplanetsinthesolarsystem.Recentlyscientistshavedecidedthatoneofthemcannolongerbeconsideredaplanet.Doyouknowthenameofthatplanet?Doyouknowwhytheyremovedit?Pluto.Scientistsnowthinkitistoosmalltobecalledaplanet.Analyzehowlifebeganonearth.ListeningListentothetapeforthestudentstofollowandhavefurtherunderstandingofthepassage.T:Readafterthetape,thenanswermesomequestionswithyourbookclosed.PlaythetapeT:Howdidwatercomeintobeingontheearth?Ifonestudentcan’tanswercompletely,asktwoorthreeormorestudents.Ss:Theexplosionoftheearthproducedwatervapor,whichturnedintowaterwhentheearthcooleddown.T:Whyiswaterimportantontheearth?Ss:Becausewaterallowedtheearthtodissolveharmfulgasesintotheoceansandseas.T:,finishthefollowingform.TextRetellingRetellthetextusingabout100words.Notes:Usethetwoquestionsandthecharttoretellthepassage;thepossibleversionbelowcanbeusedasamaterialforbothretellinganddictation.2.WritingStyleThetextiscommonsciencewriting,whichtellsthereadershowtheuniversedevelopedandhowlifebeganontheearth.Itprovidesascientificbackgroundtoanyinvestigationintospaceandit’sfactual.It’swritteninaformalway.Andalltheinformationisbasedonscientificresearch.3.MainIdeaThroughthewriter’scleardescription,weknowthathowlifebeganontheearth.It’salongandslowprocess.Fromthepassage,weknowthatearthisthebestplaceforhumantoliveon.Buthumansdidn’ttakegoodcareofitinthepast.Nowwearefacingmanyenvironmentalproblemsnow.Whatshouldwehumando?Everyonewhoreadsthepassagewillthinkaboutthisproblem.Weshouldpaymoreattentiontotakingcareofourearth.Takinggoodcareoftheearthmeanstakinggoodcareofourselves.StepⅥHomeworkRetellthepassageaccordingtotheform.Rememberimportantlanguagepoints.TheSecondperiodExtensivereadingReadandthendescribethethreewaysinwhichgravitychangedforLiYanpingandhowhisweightchanged.1.Thepullofgravitybecameverystrongshelefttheearth’satmosphere.Hisweightisnormal.2.Itdisappearedwhenhewasinspace.Heisweightless.3.Itwasverylightwhenhewasonthemoon.Heweighslessthanonearth.Explanation(略)见课件ThethirdperiodGrammarWhatpartdoestheunderlinedpartserveasineachsentence?Atreehasfallenacrosstheroad.Youareastudent.Tofindyourwaycanbeaproblem.Smokingisbadforyou.“Howdoyoudo?”isagreeting.Whatshesaidisnotyetknown.Thatweshallbelateiscertain.Itiscertainthatweshallbelate.Wecanseefromthesesentencesthatasentenceservesassubject,sowecallitSubjectClause.主语从句

（NounClausesastheSubject）定义：用作主语的从句叫主语从句，它是名词性从句之一。引导主语从句的连接词有：连词that,whether；连接代词who,what和which；连接副词when,where,how和why。1)由what等代词引起的主语从句：Whattheteachersaidtodaywasquiteright.

老师今天说的话是十分正确的。2)由连词that引起的主语从句：Thattheyarebadlyinneedofhelpisquiteclear.他们急需帮助，这是十分明显的。但是这类句子在大多数情况下会放到整个句子的后部去，而用代词it作形式主语。3)由连接代词或连接副词以及whether引起的主语从句。Whethertheywillsellthehouseisnotyetdecided.他们是否卖掉这所房子还没有决定。4)whatever,whoever也可引导主语从句。Whateverwassaidheremustbekeptsecret.这里说的话都应当保密。Whoevermakesmistakesmustcorrectthem.凡犯了错误的人都必须改正。注意:上述例句中的主语从句都是放在句首,但有时为了使句子结构平衡,避免“头重脚轻”,常用it作形式主语,而把从句放在后面。例如:Itisapitythatshehasmadesuchamistake.她犯了这样一个错误,真是遗憾。这样就构成了下面一些常用句型:1)Itis+adj./n.+从句Itisapity/shamethat...遗憾的是……Itispossiblethat...很可能……Itisunlikelythat...不可能……2)It+不及物动词+从句Itseems/appearsthat...似乎……Ithappenedthat...碰巧……3)It+be+过去分词+从句Itissaidthat...据说……Itisknowntoallthat...众所周知……Itisreportedthat...据报道……Itisbelievedthat...据信……;人们相信……Itissuggestedthat...有人建议……Itmustbepointedoutthat...必须指出……Ithasbeenprovedthat...已证明…….如:Itisbelievedthatatleastascoreofbuildingsweredamagedordestroyed.据信,至少有二十座楼房遭到破坏或彻底毁掉。5).用于Itisimportant/natural/necessary/impossiblethat...句型中,主语从句应使用虚拟语气,谓语动词用\“should+动词原形\”的形式,should有时有感情色彩。ThefourthperiodSpeakingSpeakingonpage31Whatdoyouneedifyoutraveltothemoon?Sample:S1:Let’sthinkaboutwhatwewouldneedtoprotectourskinifwevisitedtheMoon.S2:I’dtakesomeskincream.Thatworksverywellwhenwegotothesea.S3:Yes,butit’sgoingtobemuchtoohottoputcreamonyourskinontheMoon.S4:What’smoreyougetdirectheatfromthesun.TherearenocloudsontheMoontoprotectyou.S3:Ohdear,andIalsohavetocarryoxygenaroundwithmeeverywherebecausethere’snooxygenontheMoon.S2:Whydon’twecarrytheoxygenonourbacksinatank?S1:Goodidea,butwon’tthathurtourskin?S4:Ithinkitwill.Whydon’twewearaspacesuitwhichhasthepossibilityofprotectingyourskinandhelpingyoucarrytheoxygenveryeasily?S1:Averygoodidea.Wealsoneedsomesunglassesasthesunwillbeasbadforoureyesasforourskin.S3:That’sright.Thehelmetofthesuitcanhavesunglassesyoucanuse.S2:Howwillthesuitprotectourskin?S4:It’ssohottheresoIsuggestwedesignsuitthatcansupplycoldwatersothewearerfeelscoolandhotwatertowarmusifwefeelcold.S2:Great!SoIwon’tneedsuncreamafterall.That’sgood!ThefifthPeriodUsingLanguageTeachingGoals:1.ToimproveSs’listeningability.2.ToensureSshavereallygraspedtheimportantwordsandphrasesoftheunit.TeachingProcedures:Step1.ListeningPurpose:TohelpSsimprovethelisteningability.1.Pre-listening(1)AskSstolookatthephotosofthethreegreatscientistsonP30andsaysomethingaboutthem.Thenaskthemthefollowingquestions.Doyouknowaboutsomebackgroundknowledgeofthesethreegreatscientists?Canyousaysomethingaboutthem?(2)AskSstolookthroughEx1andEx2onP30andgetfullypreparedforlisteningtothetape.2.Listening(1)AskSstolistentothetapeandfinishEx1onP30.(2)PlaythetapeagainandaskSstochecktheanswersinpairs.(3)AskSstolistentothetapeforthethirdtimeandfinishEx2onP30.Thenhavesomeofthemexplaintheiranswers.Step2.ReadingPurpose:TogetSstoknowabouthumanbeing’sfeelingsofvisitingthemoon.1.FastreadingAskSstolookthroughthetextquicklyandchoosethebestanswertothefollowingquestion.Thepassageismainlyabout____?A.introductionofthemoonB.thegravitythatIfeltonmywaytothemoonC.myvisittothemoonD.myfriendYanping,anastronomerSuggestedAnswer:C.2.IntensivereadingAskSstoreadthetextcarefullyandfinishthefollowingexercises.(1)Accordingtothetext,weknowthattheforceofthegravitywouldchange_____times.A.2B.3C.4D.5(2)Whendidtheauthorfeelstrongestofthegravityoftheearth?A.Onthemoon.B.Onthehalfwaytothemoon.C.AttheverybeginningD.Ontheirleavingfromthemoon(3)Whatcausesthewritertofeelthathebecomesweightlessonthemoon?A.SpaceshipB.GravityC.HisfriendD.HisGoodfeelingsofthemoon(4)Fromthetextwecanknowifamangrowsuponthemoon,_____.A.hewillgrowtallerthanontheearthB.hewillgrowshorterthanontheearthC.hewillbecomefatterD.hewillbecomeweightlessSuggestedAnswers:(1)B(2)C(3)B(4)AStep3.SpeakingandwritingPurpose:TogetSstolearnhowtopreparealistofthingsusedforgoingtothemoon.TopracticethewritingabilityofSs.1.Dividethewholeclassinto6groups.LetSsdiscusswiththeirgroupmemberswhattheymightneedtogotothemoon.Meanwhile,askonestudentofeachgrouptowritedowntheimportantpartsoftheirdiscussion.2.AfterthediscussionSshavehadsomeknowledgeofthethingstheywouldneediftheyweregoingtothemoon.GetthemtodescribethethreewaysinwhichgravitychangedforLiYanpingandhowhisweightchanged..3.ThenSstowriteashortpassageexplainingthreeproblemstheymightmeetonthemoonaswellasthesolutionstothesedifficulties.Beforewriting,theycanhaveadiscussion.Step4.Consolidation1.AskSstofinishEx2andEx3onP63～P64andletthemchecktheanswerstogether.2.AskSstofinishthefollowingexercises.(1)Fillintheblankswithproperwordsaccordingtothegiveninformation.①Thescientificstudyofthestarsiscalleda______________.②EatingtoomuchduringtheSpringFestivalcandogreath_______toourhealth.③Thepatient’shealthisg___________improvingwiththehelpofthedoctor.④Themixtureofgasesthatsurroundtheearthiscalleda_____________.⑤Peoplecanfindlotsofv___________scenesinsomeAmericanfilms.⑥Hearingtheexcitingstory,almosteveryoneintheroom_____________(爆发)withlaughter.⑦Theforest__________(延伸)asfarastheriverbank.⑧Thewifewasmuch____________(失望的)atherhusband’sabsence.⑨Marxwas_________(强迫)toleavehismotherlandforpoliticalreasons.⑩Thereismuchdust__________(漂浮)intheair.SuggestedAnswers:①astronomy②harm③gradually④atmosphere⑤violent⑥exploded⑦spreads⑧disappointed⑨forced⑩floating(2)FinishthefollowingsentencesaccordingtotheChinese.①______________________________________(使我苦恼的)isthatIhaven'theardfromhimrecently.②Donotreadbooksinthepoorlightasitis____________________