人教版必修3：Unit+4+Astronomy_+the+science+of+the+stars+warming+up+and+reading（共33张PPT）2VIP免费

Unit4Astronomy:ThescienceofthestarsWarmingup,Pre-reading,Reading1.What’sthemeaningoftheword“Astronomy”?I.Warmingupthescienceofstars;thescientificstudyofstarsandplanets.2.Whatwordswillyouthinkofwhenwetalkaboutthistopic?star,planet,thesun/moon/earth,solarsystem恒星行星太阳月球地球太阳系3.Howmanyplanetsareinthesolarsystem?4.Doyouknowthecorrectorderoftheirdistancetothesun?nearesttothesun?farthesttothesun?5.Thenamesofeightplanets.(rememberthem)MercuryVenusEarthMarsJupiterSaturnUranusNeptune1)水星2)金星3)地球4)火星5)木星6)土星7)天王星8)海王星MercuryVenusEarthMarsJupiterUranusSaturnNeptune6.PutthemincorrectorderonP25.Doyouknowtheirorigin?II.Pre-reading1.Haveyoueveraskedyourmother,“Mom,wheredoIcomefrom”?2.Theoriginoflifeonearthisaquestionthatinterestsastronomers.Whatdoyouknowaboutit?3.Eachreligiousandculturehasitsownideasabouthowlifebeganonearth.Whatdoyouknow?III.Fast-reading1.Inthisunit,we’lllearnsomethingmorescientific.2.What’sthetitleofthetext?3.Fromthetitle,wecanpredictthatthetextmaytellustheoriginoflifeontheearth.4.Matchthemainideaforeachparagraph.Para.1Para2.Para3.Para4.para5Theimportanceofwaterforlife.Atheoryabouthowtheuniversewasformed.TheformationoftheearthThearrivalofhumansandtheireffectsontheearth.Thedecelopmentofplantsandanimals.DetailedreadingThistextcanmainlydividedintotwostagesStage1:ThedevelopmentoftheearthStage2:Thedevelopmentoflife(para1—3)(para4—5)Stage1:Thedevelopmentoftheearth(1)AftertheBigBang,whatwastheearthlike?acloudofdustasolidglobeexplodedwithfireandrockproducedwatervapourandgases(2)Whathappenednext?(3)Whatdidthewatervapourandgasesform?theearth’satmosphereWaterappeared(4)Whatappearedastheearthcooleddown?waterisimportantforthebeginningoflifeontheearth.Whyiswatersoimportantforthebeginningoflife?Becausewaterallowedtheearthtodissolveharmfulgasesintooceansandseas.Stage2Thedevelopmentoflifesmallplantsappearsinwater1.Whatlifedevelopedafterwaterappeared?Shellfishandallsortsoffish2.Whatlifedevelopedinwaternext?greenplantsbegantogrowonlandinsectsappeared3.Whataboutthelifeonland?amphibiansonlandandinthewaterforests4.Whatlifedevelopednextonland?reptilesappeareddinosaurdeveloped5.Whatlifedevelopedafterforestsappeared?mammalsonland6.Whatlifedevelopedafterdinosaurs?smallcleveranimals7.Whatlifedevelopedaftermammals?1.Whoarethesmallcleveranimalswithhandsandfeet?2.Aretheytakingcareoftheearthwell?Why?Becausetheyareputtingtoomuchcarbondioxideintotheatmosphere,whichpreventsheatfromescapingfromtheearthintospace.Theearthmaybecometoohottoliveon.Canyoufillintheblanks?23456789101smallplantsinwatershellfishandallsortsoffishinsectsreptilesamphibiansmammalsdinosaurshumansplantsanimalsGreenplantsonlandforests1.Insectsandamphibiansappeared.3.Theearthbecameasolidball.5.Reptilesappeared.7.Theearthwasacloudofdust9.Shellfishandotherfishappeared.11.Cleveranimalswithhandsandfeetappeared2.Dinosaursappeared.4.Smallplantsgrewonthewater.6.Plantsbegantogrowondryland.8.Waterappearedontheearth10.Theuniversebeganwitha“BigBand”.12.Mammalsappeared.831091151741262Canyouputtheorderofdevelopmentoflifeintoatimeline?Ex.2onP27Howlifebeganonearthisoneofthebiggestpuzzlesthatscientistsfoundhardtosolve.Whatotherpuzzlesarehiddeninthepassage?Ex.5onP27Howdoestheuniverse(earth)form?Whydidtheearthcooldown?Whydidwaterdisappearonotherplanet?Howdidthedinosaurdisappear?summaryAfterthe“bigbang”,theearthwasstilljustacloudof_______,it_______loudlywithfireandrock,whichwere_____toproducethe_________,watervapourandothergases.Then________begantoappearedontheearth.dustexplodedintimecarbonwater____________inwaterareconsideredtobetheearliestlivesontheearth.TheO2theysuppliedencouragedthelivesof______________.Slowlygreenplantsgrewonland,whichwerefollowedby__________likeinsects&________.Whentheplantsgrewinto______,______appeared.Then_______developedbutdisappearedlater,whichmadetheriseofatotallydifferentanimal,______,possible,andfinally_____spreadallovertheworld.shell--fishandfishamphibiansforestsreptilesdinosaursmammalhumansThesmallplantslandanimals1.Remembertheimprotantwordsandexpressionsinthepassage.2.Readthetextagainandfindoutyourdifficultpoints.3.Finishtheexerciseonthebook.Homework: