必修三-Unit-4-Warming-Up-and-Reading公开课教案

Module3:Unit4Astronomy:thescienceofthestarsReading：HowLifeBeganOnTheEarth公开课详细教案Teachinggoals:Knowledgeaims:1.GetSstolearntheusefulwordsandexpressionsinthispart:violent,solid,explode,intime,eventually,carbondioxide(CO2),oxygen,nitrogen,watervapour,atmosphere,dissolve,harmful,multiply,shellfish,amphibian,reptile,mammal,exist,spread,prevent...from…,dependon.2.LetSslearnaboutthedevelopmentofthelife.Skillaims:1.ImproveSs’readingskills:skimming,scanning,andreadingfortheorganizationofthetext.2.EnlargeSs’knowledgeontheevolvementofthelifeontheearth.Moralcultureaims:1.TrainSs’interestinscienceandstimulatetheirloveforastronomy.2.ArouseandstrengthenSs’senseofenvironmentalprotection.Teachingimportantanddifficultpoints:1.Getthestudentstoknowthedevelopmentoflife.2.LetSs’learnhowtousedifferentreadingskillsfordifferentreadingpurposes.Teachingaids:PowerPoint;acomputer;ataperecorder.Teachingmethods＆strategies:1.Task-basedteachingandlearning＆skimmingandscanning.2.Asking-and-answeringactivitytocheckSs’understandingofthetext.3.Co-operationstrategyfordiscussion.4.Individual,pairorgroupworktofinisheachtask.TeachingprocedureStepILeading-in(1mins)FreetalkwithSs.Lastlesson,wehavelearnedthatthereareeightplanetsinoursolarsystemcirclingaroundthesun.Istherelifeontheplanets?Notalltheplanetshavelifeon,butourearthexistslife.StepIIPre-reading(3mins)1.Eachreligionandculturehasitsownideasabouthowlifebeganonearth.Whatdoyouknow?Therearemanydifferentlegendsthattellhowlifebeganonearth.InChina,itissaidthatPanguseparatestheskyfromtheearthandhiswholebodyturnsintoallkindsofthingsintheuniverse.AndtheGoddessNvwamendedtheheavenandcreatedhumanbeings.Inwesternculture,GodcreatedtheworldinsixdaysinBibleandhecreatedthefirstmanandthefirstwomancalledAdamandEve.2.Aretheytrueforthebeginningofthelife?Doyouknowwhatascientificideais?Theyareonlylegends.Asascientificidea,ouruniversebeganinabigbangabout15billionyearsago.(TheBigBangisthetermusedtodescribeahugeexplosionwhichthrewmatterinalldirections,creatingouruniverse.)Nowwe’llcometotheReadingHowLifeBeganOnTheEarthandfindouttheexactanswer.StepⅢWhile-reading(28mins)First,let’sreadthetitleandlookatthepictures.Canyoupredictwhatthereadingwillbeabout?Thedevelopmentoflife?Beforewecheckifyouareright,let’sreviewsomewordsandexpressions.Task1:Skimming(Payattentiontothekeywordsinred)(12mins)Readthepassageaslisteningtothetape,andthenanswerthefollowingquestions.1.How1.Howdidtheuniversebeginaccordingtoawidelyacceptedtheory?〔〕TheuniversebeganwithaBigBang.2.Whatwasproducedwhentheearthexploded?〔〕Watervapour,carbondioxide,oxygen,nitrogenandothergases.3.Whyiswaterimportantontheearth?〔〕Itallowedtheearthtodissolveharmfulgasesintooceansandseas.4.Whydidgreenplantshelplifetodevelop?〔〕Becausegreenplantscantakecarbondioxidefromtheatmosphereandfilltheairwithoxygen.5.Whyweremammalsdifferentfromotherlifeforms?〔〕Becausetheygavebirthtoyoungbabyanimalsandproducedmilktofeedthem.6.What’stheproblemwiththeearthnow?〔〕Theearthmaybecometoohottoliveon.1.LookatthequestionsfirstonthescreenandexplainthemforSs.2.PlaytheradioforSstolistentoandreadthepassage.3.GiveSs6minutestofindouttheanswers.4.Checktheanswerswithvolunteers.Afteranswering,givethemsomeencouragementwith“Well-done!Goodjob!Excellentjob!andsoon”Task2:Scanning(6mins)TurntoPage27,andlookatExercise2.Nowreadthepassageonceagainandputtheorderofdevelopmentoflifeintoatimelineaccordingtothereadingpassage.Youcanworkwithyourpartner.LetSsfinishtheexercisewithin3minuetsandchecktheansweraltogether.Task3:Readfortheorganization&logic(10mins)Readthepassagecarefullyonceagainandanalyseitsstructure.Writedownthemainideaforeachparagraph.1.LetSsfinishtheexercisewithin3minuetsandchecktheanswersaltogether..2.Checkthepredictionbeforereading.Whatisthemainideaofthepassage?Howlifebeganontheearth3.Bytheway,whatorderisthepassageorganizedin?Timeorder/chronologicalorder.StepⅣPost-reading(10mins)Attheendofthepassage,weallhaveknownthattheearthmaybecometoohotforthelivesonit,sowhetherlifewillcontinueontheearthformillionyearstocomewilldependonwhetherthisproblemcanbesolved.(Tosolvethisproblem,peopleshouldprotecttheearthcarefully.)Wehaveonlyoneearth!Weshouldtakecareoftheearth!Task4:Groupdiscussion:Asastudent,whatlittlethingscanwedofortheearth?1.LetSsturnaroundanddiscussingroups.Andthenchooseaspokesmanforthegroup.2.Collecttheanswersfromthegroups.3.ShowthepossibleanswersforSs.StepVHomework1.Concludethetextbyusing30words.2.Readthepassageafterclassandunderlinethelanguagepointsyoudon’tunderstandinthetext.Nowlet’sendourclasswithasayingwrittenbyJaneGoodall.Onlyifweunderstandcanwecare;唯有了解，我们才会关心；onlyifwecarewillwehelp;唯有关心，我们才会行动；onlyifwehelpshallallbesaved.唯有行动，生命才会有希望。——JaneGoodall珍妮·古道尔StepⅥThedesignforwritingontheblackboardUnit4Astronomy:thescienceofthestarsUnit4Astronomy:thescienceofthestarsHowLifeBeganOnTheEarthPrediction:Whathappenedtotheearth?