高中必修3英语Unit4第五课时教案

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1、Period5Usinglanguage$ReadingtaskStep1.LeadinT:Wehavelearntalotaboutastronomy,haveyougotinterestedinit?Ifyouaregoingtostudyastronomy,whatproblemwillyoufacemost?S2:Gravity.T:Whatisgravity?S3:Everythingwillfallbacktotheearthifitisdroppedorthrownaway.Thepulloftheearthiscalledgravity.T:Qu

2、iteright.Whofirstgottheideaofgravity?S4:IsaacNewton.T:Howdidhegettheidea?S5:Onedayhewassittingunderthetree.Hesawanapplefall,whichmadehimgettheidea.BesidesNewton,arethereanyotherscientistswhomadeagreatcontributiontotheideaofgravity?S6:AlbertEinstein,StephenHawking.T:Howdideachofthemth

3、inkofgravity?Ordidtheysharethesameideaofgravity?Comeon,thetapewilltellyou.Step2Listening1.Listentothetapeandchoosethebestmainideaofthelisteningpassage(Ex.2P30).Mainidea:①Iheardabouthowthreemenmademistakeswhentheytriedtodescribegravity.②Iheardabouthowthreemenwantedtofindoutaboutthebeg

4、inningoftheuniverse.③Iheardabouthowtheideaofgravityhasdevelopedoveralongperiodoftime.④Iheardaboutthreescientistsandtheirwork.Thebestanswer:③1.ListentothetapeagainandfillinthechartinEx.1onP30.IsaacNewtonAlbertEinsteinStephenHawkingDates1642-17271879-19551942-IdeaEverythingisaffectedby

5、aforcecalledgravityGravityisconnectedtotimeandspace“Blackholes”“eat”objectsbutalso“spit”themoutOtherinformationItwasonlyabouttheearthItwasabouttheuniverseItwasaboutthingsfoundintheuniversecalled“blackholes”(Note:Astronomersandscientiststhinkthatablackholeisaregionofspace(notathing)in

6、towhichmatterhasfallenandfromwhichnothingcanescape—notevenlight.Sowecan’tseeablackhole.Ablackholeexertsastronggravitationalpullandyetithasnomatter.Itisonlyspace-orsowethink.)