unit4astronomy:thescienceofstarwarmingupamp;reading教案 howlifebeganontheearthstepone:warminguptask1:commomsense(常识)ofscience。physics,chemistry,biology(studyoflife),geology(地质学)andmathematicsaresciencesubjects。somesciencesubjectswillstudytwoormoreofthesesubjects,forexample,thestudyofphysicsandmathematicsisastronomy(天文学)。canyouunderstandthefollowingcombinedsciencesubjects。1。physicsmathematicsastronomy2。geologyphysicsgeophysics(地球物理学)3。biologychemistrybiochemistry()medicine()4。geopolitics(地缘政治学)5。bioengineering()task2:commonsenseofbiologystudyofthegroupsoflife(生命的种类物种)lookatthepicturesonthescreenandjudgethegroupsasquicklyasyoucan。whatisthemostimportantconditionforlifetodevelop(grow)?(water,airoxygen)steptwprereadingtheworldislikeabigfamily。it’swonderfulandcolorfulbecauseofdifferentkindsoflifelivingtogether。buthowdidlifebeginontheearth?thefirstquestionforscientiststoanswerishowwaterappearedontheearth?stepthree:readingtask1:fastreading(para1)1。whatistheimportantevent(事件)totheearthbeforetheappearanceofwater?2。whyiswaterimportantforthebeginningoflife?task2:sacnning(para1,2,3)thebeginningofwateramp;thebeginningoflifescanpara1:thebeginningofwater1。thebigbang2。acloudofdust(combineinto)3。aballasolidshape(explode)4。watervapour,oxygen,andothergas(cooldown)5。waterscanpara2,3:thebeginningoflife(putthemintorightorder)a。insectsandamphibiansappearb。reptilesappearc。shellfishandotherfishappeard。dinosaursappeare。smallplantsgrowonthewaterf。plantsbegintogrowondrylandg。mammals(includinghumans)appear5。water6。7。8。9。10。11。12。task3:carefulreading1。whytheearthwasdifferentafterthewaterappeared?2。whydidplantsgrowbeforeanimals?3。whydidanimalsfirstappearintheseanotontheland?4。whatisthemaindifferencebetweenreptilesandmammals?canyougivesomeexamplesofmammals?stepfour:cooperativelearningdisscussthefollowingquestions,andusepara4tohelpyou。1。whydopeoplebecomethemostimportantanimalsontheplanet?2。dopeopletakecareoftheearth?whataretheydoingtotheplanet?3。whatistheresult?stepfour:discussformoraleducation8226;whydiddinosaursdieout?8226;doyouthinktherewillbeasuddenchangeofweatherontheearth?8226;whatshouldpeopledotoprotectourearth?exxforevaluation:afterthebigban,theearthwasjustacloudofdust。itloudlywithfireandrocks,whichweretoproducethewatervapour,andothergases。thensmalllantsgrew。theyandfilledtheoceansandseaswithoxygen。manymillionsofyearslater,thefirstgrenplantsbegantoonland。whentheplantsgrewintoforests,appearedforthefirsttime。theyproducedyounggenerallybyeggs。whendinosaursdisappeared,becamemoreimportant。nowsmallcleveranimalswithappearedandallovertheworld。astimewentbytheycoveredtheearthandtheyareputtingtoomuchcarbondioxideintothe,whichheatescapingfromtheearthintospace。whetherlifewillcontinueonearthformillionsofyearstocomewillwhetherthisproblemcanbesolved。