必修三Unit4_Astronomy_全单元课件[1]1

welcome Unit4Astronomy thescienceofthestars a EnableSstotalkaboutthescienceofthestars Teachinggoals教学目标 b Understandthetextandanswerthefollowingquestions Teachingimportantpoints教学重点 Teachingdifficultpoints教学难点 d Discussion Whatwillourfuturebeiftheearthmaybecometoohotforthelivesonit Whatwasthereontheearthbeforelifecouldbegin Talkaboutthebeginningoflifeontheearth Teachingmethods教学方法 a Skimmingandscanning b Asking and answeringactivitytochecktheSs understandingofthetext c Individual pairorgroupworktofinisheachtask Doyoulikestarsorplanets TheSolarSystem 1111 Unit4Astronomy thescienceofthestars TheSolarsystem eightplanetsmanycomets 彗星 otherobjects Neptune Mercury Venus Earth Mars Jupiter Saturn Uranus Whatarethenamesoftheeightplanetsthatcircleoursun 水星 金星 地球 火星 木星 土星 天王星 海王星 DuMinjunxicomesfromtheplanetofKmt184 05 it ssaidthatit sclimateandenvironmentaresimilartotheearth s Butdoitreallyexist Maybenotbecauseonlyonearththereislife HowLifeBeganontheEarth Period1 Eachreligionandculturehasitsownideasabouthowlifebeganonearth Whatdoyouknow InChina weallknowthatPanguseparatestheskyfromtheearthandNvwamadehumans Inwesternculture Godcreatedtheworldinsevendays Ideasabouthowlifebegan TheBigBang Fillintheblankstolearnabouthowlifebegan understandthemeaningofeachparagraph Para 1Para 2Para 3 The oftheearth Theimportanceof forlife The ofplantsandanimals Thearrivalof andtheireffectsontheearth theory formation water development humans Beforelifeappeared Differentlivesdeveloped Para 4Para 5 Howlifebeganontheearth A abouthowtheuniversewasformed ReadPart1 para1 3 Beforelifeappeared Howdidtheearth satmosphereform Whywastheearthdifferentfromtheotherplanets Whatarolethewaterplayedinthedevelopmentoflife 1 Howdidtheearth satmosphereform Theearthwassoviolent Itexplodedloudlywithfireandrocktoproducecarbon nitrogen watervaporandothergases whichweretomaketheatmosphere 2 Whywastheearthdifferentfromtheotherplanets Becausethewateronotherplanetshaddisappearedlater 3 Whatarolethewaterplayedinthedevelopmentoflife Thepresenceofwaterallowedtheearthtodissolveharmfulgasesandacidsintotheoceansandseas Thisproduceachainreactionwhichmadeitpossibleforlifetodevelop water 1smallplantsinwater 2shellfishandallsortsoffish 3insects onland 4amphibians onlandandinwater forests 5reptiles onland 6dinosaurs onland 7mammals onland smallcleveranimalswithhandsandfeet 8human Analyzinghowlifebeganontheearth ReadPart2 para4 5 Listentothetape Accordingtothepicturestosummarizethepassage Listencarefully BigBang Acloudofdust Atmosphere Theearth Asolidball water water Plantsinthewater Shellfishandfish Plantsonland Insectsandamphibians Reptiles Dinosaurs Mammals humanscameintobeingandspreadallovertheworld Theearthmaybecometoohottoliveon Theyareputtingtoomuchcarbondioxide Look Thereissomeonecuttingatreedown Whatshouldwedoforourearth Youcanusethefollowingwordsorphrases watersource makefulluseof drinkingwater stop electricityimportant turnoff forestscutdown recycle Savewater Wateristhesourceoflife Nowater nolife Saveelectricity Itisimportant Wecan timaginewhatSaveforests Theyareuseful Pleasestopcuttingthemdownanduserecycledpaperinstead Makeourworlda Onlyifwecarewillwehelp Onlyifwehelpshallallbesaved Soit sveryimportantforustodoso Notonlyshouldweprotectdrinkingwaterandstoppollutingit butalsomakefulluseofit thelifewillbelikewithoutit Everyoneshoulddohisbesttosaveelectricity Don tforgettoturnofflightsorotherelectricmachineswhenwefinishworking greenonetolivein Wehaveonlyoneearth Let stakepartintheactivitiestosavetheearth Abouthowtoprotecttheearthwriteashortpassageusethesentencesyoujustnowprepared Thankyou ReadPart1 para1 3 Beforelifeappeared Accordingtoawidelyacceptedtheory howdidthestarsform Howdidtheearth satmosphereform Whywastheearthdifferentfromtheotherplanets Whatarolethewaterplayedinthedevelopmentoflife 1 Accordingtoawidelyacceptedtheory howdidthestarsform 2 Howdidtheearth satmosphereform Theuniversebeganwitha BigBang thatthrewmatterinalldirections thenatomsbegantoformandcombinetocreatestars Theearthwassoviolent Itexplodedloudlywithfireandrocktoproducecarbon nitrogen watervaporandothergases whichweretomaketheatmosphere 3 Whywastheearthdifferentfromtheotherplanets 4 Whatarolethewaterpl