Unit 4 Astronomy: the science ofstars教案Unit4Astronomy:thescienceofstars教案Teachingaims:.Talkaboutthescienceofstars2.PractisegivinginstructionsTeachingdifficulties:1. Learntousenounclausesasthesubject2.Learntowriteanessaytoshowyourproblemsandthewaytoo vercomethem.3.Vocabulary:astronomy,atmosphere,violent,explode,s urface,disappointed,gradually,cheer,mass,harmful,pr esence,intime,prevent…from…dependon,nowthat,getthehangof,breakoutTeachingprocedures:ThefirstperiodIntensivereading StepⅠPresentationT:Hello,everyone!TodaywewillcometoUnit4,Astronomy.B eforethatIhaveaquestion:wheredowecomefrom?orwecansa y:whoareourancestors?S1:monkeys!S2:BeijingRenwholivedmanyyearsago.S3:dinosaurs…T:Verygood!Doyouknowwhatitwaslikebeforelifeappeared onearth?S4:Fullofwater…Bs:Idon’tknow.T:Doyouwanttogetmoreinformation?Ss:yes,wedo.T:Todaywewilllearnsomethingabouthowlifebeganonearth .Turntopage25.Let’scometowarmingupfirst.StepⅡwarmingup.Readthethreequestions,whilethestudentslistenandfollow.2.Givethestudentsseveralminutestodiscussthequestion s.3.collectanswersfromtheclass.4.checkanswerswhilediscussing.StepⅢPre-readingGetthestudentstodiscussthequestionsonpage25withthei rpartners.Thenaskthestudentstotelltheirstories.Enco uragethemtotelldifferentstories,Iftheydon’tknowany,tellthemsome.T:Nowdiscussthesequestionswithyourpartners.ThenIwil lasksomeofyoutotellusyourstories.Areyouclear?Ss:yes.a.Doyouknoweachreligionorculturehasitsownideasabout thebeginningoftheuniverse?Giveanexampleifyouknow.b.Doyouknowwhatascientificideais?Readsomestoriestothestudents.Panguseparatestheskyfromtheearth;TheBiblicalAccount;India;japan;Europe;…StepⅣReading.ScanningGetthestudentstoreadthepassagequicklyandaccuratelya ndmeanwhilehelpthestudentstoformagoodhabitofreading .Givethestudentsacoupleofminutestolookthrouththewho lepassage.Tellthemtoreadsilentlyandthenasksomedetai ledquestionsaboutthetext.Encouragethemtoexpressthei rideas.T:wearegoingtolearnapassageabouthowlifebeganontheea rth.Nowreadthetextquicklyandthenanswermyquestions.a.whatwasthereontheearthbeforelifebegan?b.whydoscientistthinktherehasneverbeenlifeonthemoon?c.whydoanimalsfirstappearinthesea?d.whydogreenplantshelplifetodevelop?e.whyweremammalsdifferentfromotheranimals?Discusstheanswerswiththewholeclass.2.SkimmingInthispart,studentswillreadthetextagainandfinishpar t1,2,3T:Nowskimthepassagefasttofinishpart1,2,3,4Thenwewil lchecktheanswerstogether.keytopart1:DBIGEHAcFjDiscusstherestwiththestudents.StepⅤListeningListentothetapeforthestudentstofollowandhavefurther understandingofthepassage.T:Readafterthetape,thenanswermesomequestionswithyou rbookclosed.a.Howdidwatercomeintobeingontheearth?b.whyiswaterimportantonearth?StepⅥLanguagepointsT:Turntopage25.Let’slookatthesentences:a.Itexplodedloudlywithfireandrock,whichwereintimeto producethewatervapour.whichleadsnon-restrictiveattributiveclause.intime:soonerorlater;eventuallyIwillseehimintime.Intime:notlateShewillbebackintimetopreparedinner.In/outoftime:in/notinthecorrecttimeTheaudienceclappedintimetothemusic.b.Nobodyknewthatitwasgoingtobedifferentfromotherpla netsgoingaroundthesun.Bedifferentfrom:notlikesomeoneorsomethingelseinoneo rmorewayscitylifeisquitedifferentfromcountrylife.c.whetherlifewillcontinueontheearthformillionsofyea rstocomewilldependonwhetherthisproblemcanbesolved.Tocome:servesasattributiveSheisthelastpersontodosuchathing.Dependon:somethingmightonlyhappenorbetrueifthecircu mstancesarerightforitoursuccessdependsonwhethereveryoneworkshardornot.d.walkingdoesneedabitofpracticenowthatgravityhascha nged.Nowthat:becauseofthefactthatNowthatIamfree,Icanenjoymusicforawhile.Nowthatyouhavegrownup,youcandecideitbyyourself.StepⅦHomework.Retellthepassage2.RememberimportantlanguagepointsThesecondperiodLanguagestudyStepⅠRevision.checkretellingofthepassage2.Translatethefollowingsentences.a.你迟早会成功的.b.我的车与你的不一样.c.站在门旁边的那个人是谁?d.他总是第一个来,最后一个走.e.既然你已经长大了,你自己决定吧.Suggestedanswers:a.youwillsucceedintime.b.mycarisdifferentfromyours.c.whoisthepersonstandingbythedoor?d.Heisalwaysthefirsttocomeandthelasttogo.e.Nowthatyouhavegrownupyoucandecideityourself.StepⅡwordstudyThispartisaconsolidationofthewordslearntinthisunit. Askthestudentstodotheexercisesindividually.a.Page27.Firstletstudentsfinishpart1,2b.checktheanswerswiththewholeclass.c.Givestudents3minutestofinishpart3.d.Letthestudentsreadpart4forawhileandfinishit.e.Turntopage63.Firstletthestudentsfinish1and2andche cktheanswers.StepⅢPreparationShowsomesentencesontheblackboard.a.Atreehasfallenacrosstheroad.b.youareastudent.c.Tofindyourwaycanbeaproblem.d.Smokingisbadforyou.e.“Howdoyoudo?”isagreeting.f.whatshesaidisnotyetknown.g.Thatweshallbelateiscertain.h.It’scertainthatweshallbelate.T:whatpartdoestheunderlinedpartserveasineachsentenc e?orfinditssubjectineachsentence.StepⅣGrammar.Givethestudentssometimetofindthesentencesinthe passage.Thecollectanswersfromtheclass.2.Showtypicalexamplesofhowtomakeasubjectclause.Guid etheSstofindoutwhatchangeswehavetomakewhenwemakease ntenceorcombinetwosentencesusingsubjectclause.Teach ershowstheexampleandSswritedownthesentences.3.Turntopage64.Readthefollowingpassagequicklyandfin ishtheeightsentences.4.Haveadiscussioninpairs.Thetopicismydream.onetalksabouttheproblemsinhisstudyorlife,anothergivessomead vice.Remindthestudentstousethefollowingstructuresa.myproblemis…b.mytroubleis…c.Thequestionis…d.myadviceis…e.whatIthinkaboutitis…f.Thefactis…g.mysuggestionis…StepⅤHomework.Finishpart32.Finishpart3Addedmaterial:什么是黑洞？就是在宇宙中有那么一些点，这些点的体积趋向于零而密度变得无穷大，由于具有强大的吸引力，物体只要进入离这个点一定距离的范围内，就会被这个强大的引力吸收掉，连光线也不例外。