高中英语 unit 4 astronomy导学案1新人教版必修3

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1、Unit4AstronomyPre-reading.1.Theoriginoflifeonearthisaquestionthatinterestsastronomers.Whatdoyouknowaboutit?•Howoldistheuniverse?(severalbillionyearsago)•HowoldistheEarth?(between4.5and3.8millionyearsago)•WhichwerethefirstcreaturesorplantsonEarth2.Eachreligionandculturehasitsownidea

2、sabouthowlifebeganonearth.Whatdoyouknow?InChina,weallknowthatPanguseparatestheskyfromtheearth.Questions:1.Whatdowemeanwhenwesaywearestudyingasubjectscientifically?Orwhat’sthecorrectattitudetowardsscience?Weshouldbeobjective,notsuperstitious.2.What’sthecorrectwaytoproveascientificid

3、ea?Weshoulddesignexperimentstotestitforseveraltimes.Thenwecananalyzetheresultsanddrawaconclusionatlast.3.Whatarethemostimportantskillsweneedtoberealscientists?Careful,objectiveandlogical,drawconclusionsfromtheexperimentsandnotimposeconclusionsonthedata.(impose…on…把…强加于…)ReadingI.Re

4、adthepassagecarefullyandanalyseitsstructure.Writedownthemainideaforeachparagraph.Para1AwidelyacceptedtheoryabouttheformationoftheuniversePara2TheformationoftheearthPara3TheimportanceofwaterforlifePara4ThedevelopmentofplantsandanimalsontheearthPara5Thearrivalofhumansandtheirimpacton

5、theearthII.Readthetextandfillintheblanksinthefollowingform.TimeWhathappenedBigBang______begantoformandcombinetocreatestarsandotherbodies.Between4.5and3.8billionyearsago●Dustsettledintoasolidand______globe.●Theearthexplodedtoproduceits___________.●Thecontinued________ofwaterallowedt

6、heearthtodissolveharmfulgasesand_____intotheoceansandseas.Manymillionsofyearslater●Thefirstsmallplantsonthesurfaceofthewaterproduced_______.●Early_______andallsortsoffishappeared.●Greenplantsbegantogrowonland.●Insectsand___________appeared.IV.True(T)orFalse(F).1.Theearthappearedbef

7、oretheBigBanghappened.2.Theoriginalatmosphereconsistedofnitrogenandoxygen.3.WateralsoappearedonotherplanetslikeMars,butitdisappearedlater.4.Lifebeganinwaterandthenonland.5.Mammalsappearedbeforethedevelopmentofdinosaurs.Howlifebeganonearthisoneofthebiggestpuzzlesthatscientistsfoundh

8、ardtosolve.Whatotherpuzzle