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1、Unit4Astronomy:thescienceofthestarsPeriodtwoReading---HOWLIFEBEGANONTHEEARTH教学目标：知识与技能：1.Enablestudentstoimprovetheirreadingandself-learningability.2.Enablestudentstounderstandtheformationofearthandthedevelopmentoflifeoneartha情感态度与价值观：1.ToenableSstorealize
2、thebadeffectbroughtbyhumanbeingsandconcernaboutthefutureoflifeontheearth.2.Arousestudents’interesttosearchforthemysteryofspace.过程与方法：Teachingmethods:skimming,scanning,discussing,groupcoorperation.Teachingprocedures:课前自主学习：1.Importantwordsandphrases重点词汇和短语A
3、stronomy_________,atmosphere________,system________,violent_______,solid________,Explode__________,carbon_________,dioxide_________,oxygen_______,surface________,Planet_________harmful__________,development_________,spread_______,method_____,solarsystem___
4、_____,intime________,prevent…from_________,dependon____________2.重点句子（在文章中找到这些句子，并翻译下面这些句子。）1.Whatitwastobecomewasamysteryuntilthedustbegantoslowlycombineintoaballmovingaroundthesun.P25_______________________________________________________________________
5、________2.It’sexplodedloudlywithfireandrock,whichwereintimetoproducethewatervapour,carbondioxide,oxygen,nitrogenandothergases,whichweretomaketheearth’satmosphere.P25_______________________________________________________________________________3.Itallowedt
6、heearthtodissolveharmfulgases,whichhadbecomepartoftheearth’satmosphere,intotheoceansandseas.P25_______________________________________________________________________________4.Whetherlifewillcontinueontheearthformillionsofyearstocomewilldependonwhetherthis
7、problemcanbesolved.P26_______________________________________________________________________________Teachingprocedure:Pre-reading:Thinkaboutthesetwoquestions1.Doyouknowtheoriginoflifeonearth?2.Eachreligionandculturehasitsownideasabouthowlifebeganonearth.W
8、hatdoyouknowFastreading:Task1:1.Findoutthemainideaofthistext:_____________________________________________2Findoutthemainideaforeachparagraph:•Para.1A.Theimportanceofwaterforlife•Para.2B.Theformationoftheeart
