必修三Unit4-Astronomy-全单元课件11

welcomeUnit4Astronomy:thescienceofthestarsa.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?TheSolarSystem1111Unit4

Astronomy:thescienceofthestarsTheSolarsystem

eightplanetsmanycomets(彗星)otherobjects

NeptuneMercury

VenusEarthMarsJupiter

SaturnUranus

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.HowLifeBeganontheEarthPeriod1

Eachreligionandculturehasitsownideasabouthowlifebeganonearth.Whatdoyouknow?

InChina,weallknowthatPanguseparatestheskyfromtheearthandNvwamadehumans.Inwesternculture,Godcreatedtheworldinsevendays.IdeasabouthowlifebeganTheBigBang

Fillintheblankstolearnabouthowlifebegan.understandthemeaningofeachparagraph.Para.1

Para.2Para.3The__________oftheearthTheimportanceof______forlifeThe_______________ofplantsandanimalsThearrivalof_________andtheireffectsontheearththeoryformationwaterdevelopmenthumansBeforelifeappeared.Differentlivesdeveloped.Para.4Para.5HowlifebeganontheearthA_______abouthowtheuniversewasformedReadPart1(para1~3)BeforelifeappearedHowdidtheearth’satmosphereform?Whywastheearthdifferentfromtheotherplanets?Whatarolethewaterplayedinthedevelopmentoflife?1.Howdidtheearth’satmosphereform?Theearthwassoviolent.Itexplodedloudlywithfireandrocktoproducecarbon,nitrogen,watervaporandothergases,whichweretomaketheatmosphere.2.Whywastheearthdifferentfromtheotherplanets?

Becausethewateronotherplanetshaddisappearedlater.3.Whatarolethewaterplayedinthedevelopmentoflife?Thepresenceofwaterallowedtheearthtodissolveharmfulgasesandacidsintotheoceansandseas.Thisproduceachainreactionwhichmadeitpossibleforlifetodevelopwater1smallplantsinwater2shellfishandallsortsoffishgreen

plantsonland3insects(onland)4amphibians(onlandandinwater)forests5reptiles(onland)6dinosaurs(onland)7mammals(onland)smallcleveranimalswithhandsandfeet8humanAnalyzinghowlifebeganontheearthReadPart2(para4~5)ListentothetapeAccordingtothepicturestosummarizethepassageListencarefullyBigBangAcloudofdust

AtmosphereTheearthAsolidballwaterwaterPlantsinthewaterShellfishandfishPlantsonlandInsectsandamphibiansReptilesDinosaursMammals

humanscameintobeingandspreadallovertheworld.Theearthmaybecometoohottoliveon.Theyareputtingtoomuchcarbondioxide.Look!ThereissomeonecuttingatreedownWhatshouldwedoforourearth?Youcanusethefollowingwordsorphraseswater

source,makefulluseof

,drinkingwater

,

stop.electricity

important,turnoff.forestscutdown,recycle.

Savewater.Wateristhesourceoflife.Nowater,nolife.Saveelectricity.Itisimportant.Wecan'timaginewhat

Saveforests.Theyareuseful.Pleasestopcuttingthemdownanduserecycledpaperinstead.MakeourworldaOnlyifwecarewillwehelp!Onlyifwehelpshallallbesaved!Soit'sveryimportantforustodoso.Notonlyshouldweprotectdrinkingwaterandstoppollutingit,butalsomakefulluseofit.thelifewillbelikewithoutit.Everyoneshoulddohisbesttosaveelectricity.Don'tforgettoturnofflightsorotherelectricmachineswhenwefinishworking.greenonetolivein.Wehaveonlyoneearth!!!Let’stakepartintheactivitiestosavetheearth!Abouthowtoprotecttheearthwriteashortpassageusethesentencesyoujustnowprepared.Thankyou!ReadPart1(para1~3)BeforelifeappearedAccordingtoawidelyacceptedtheory,howdidthestarsform?Howdidtheearth’satmosphereform?Whywastheearthdifferentfromtheotherplanets?Whatarolethewaterplayedinthedevelopmentoflife?1.Accordingtoawidelyacceptedtheory,howdidthestarsform?2.Howdidtheearth’satmosphereform?

Theuniversebeganwitha“BigBang”thatthrewmatterinalldi