高中二年级上学期英语《必修三 unit 4 拓展》教学课件.pptx

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高中二年级上学期英语《必修三 unit 4 拓展》教学课件.pptx

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人教版必修三Unit4SpaceExplorationExpansion

Lead-inAlyssaCarsonCouldyouguessherworkbasedonherclothing?Astronaut

Shewasbornin2001,andnowsheisabout21yearsold.Accordingtotheplan,theearliestplanofmannedlandingonMarsmaybein2033.Atthattime,sheis32yearsold.Beforeshecompletesthistask,shemaynotbeabletomarryandhavechildrenlikeanormalgirl,andshealsochoosestoriskherlifetoherbelovedaerospacecareer.

AssumptiononterraformingofMarscreateheatprimitivelifegotwatergrowupreleaseoxygen

AthomeonMars

BeforeReadingPredicting:Whatdoyouthinkthepassageisabout?A.thetechnologywewillusetotraveltoMarsandotherplanetsB.whatanaveragedayonMarswillbelikeforpeopleinthefutureC.howwecanmakeMarsaplacewherepeoplecanlive

BeforeReadingPrepareWordsceadbdceab

WhileReading

WhileReadingDetailedquestions:1.Whatplansarescientistsworkingon?2.Whatthreebasicthingsdohumansneed?3.WhyMarsnowisn’thabitable?4.WhichwordcouldsummarizetheprocessofmakingMarshabitable?5.Whatdoes“terraforming”mean?6.What’sthemaingoalofterraformingMars?7.WhyisEarthbecomingwarmer?8.HowcouldwecreatesimilarconditionsonMars?9.ListdifficultiesinterraformingMars.Answers:1.ToturnMarsintoanewEarth2.watertodrink;airtobreathe;foodtoeat3.noenoughoxygen;noliquidwater4.Terraforming5.ChangingtheenvironmentofaplanetsothatitissimilartoEarth’s6.Towarmitup7.increasedlevelsofgreenhousegases

WhileReadingQuestion8:HowcouldwecreatesimilarconditionsonMars?changetheatmosphererainwillfall;growplantsforfoodaddmoreoxygentotheair