必修三-第四单元-公开课

Unit4Astronomy:thescienceofthestars建工师第一中学讲课教师：王洁ReadingSolarsystemMyVeryExcellentMotherJustSentUs

NinePizzas.Howtoremembertheorderofeightplanetsaroundthesun?EarthJupiterMarsMercuryNeptuneSaturnUranusVenusReadingHowLifeBeganontheEarth

TaskOneReadthetextquickly(3minutes)andanswerthefollowingquestions.Youcandiscussthesequestionsinpairs.(specialinformation:timeorderandsentenceconnector)FastReading

1.Howdidtheuniversebeginaccordingtoawidelyacceptedtheory?

2.Whatwasproducedwhentheearthexploded?

3.Whyiswaterimportantontheearth?

4.Whyweremammalsdifferentfromotherlifeforms?

5.What’stheproblemwiththeearthnow?

1.Howdidtheuniversebeginaccordingtoawidelyacceptedtheory?

2.Whatwasproducedwhentheearth

exploded?

3.Whyiswaterimportantontheearth?

TheuniversebeganwithaBigBang.Watervapour,carbondioxide,oxygen,nitrogenandothergases.

Becauseitallowstheearthtodissolveharmfulgasesandacidsintooceansandseas.

4.Whyweremammalsdifferentfromotherlifeforms?

5.What’stheproblemwiththeearthnow?

Becausetheygavebirthtoyoungbabyanimalsandproducedmilktofeedthem.

Theearthmaybecometoohottoliveon.

TaskTwoCompetitionDiscussingroups(3minutes).Concludethemainideaofeachparagraph.Youcanusesomewordstofillintheblank.

Concludethemainideaofeachparagraph.Para.1Awidely______abouthowtheuniverse_____.Para.2Theformationofthe______.Para.3The__________ofwaterforlife.Para.4Thedevelopmentof______and_______ontheearth.Para.5Thearrivalof_______andtheirinfluenceontheearth.theorybeganearthimportanceplantsanimalshumans

ThistextcanbemainlydividedintotwopartsPart1:ThedevelopmentoftheearthPart2:Thedevelopmentofthelife(para.—)(para.—)CarefulReading1325ThedevelopmentoftheearthPart1Readparagraph1~2carefully.

Writedownkeywordstofillintheblank.Pleasepayattentiontothetimeorder.

TaskThreeBigBangAcloudofdust

explodedwithfireandrock

AsolidglobeAfterseveralbillionyears

Between4.5and3.8billionyears

violentAtmosphereproducedcarbondioxide,nitrogen,watervapour&gasesWaterappeared

intime

cooleddownweretomake

ThistextcanbemainlydividedintotwopartsPart1:ThedevelopmentoftheearthPart2:Thedevelopmentofthelife(para.1—2)(para.3—5)ThedevelopmentofthelifePart2Discussingroupsoffour.

Readparagraph3~5carefullythistimetogetimportantdetails.

Fillinthechartaboutthedevelopmentoflife.

TaskFourwatergreenplants(onland)10

1smallplants(inwater)23

insects(onland)4(inwater&onland)5

(onland)6

(onland)7

(onland)89NextLatermanymillionsofyearslaterthefirsttimeafterthat65millionyearsago2.6millionyearsagoNowshellfishandallsortsoffishamphibiansforestsreptilesdinosaursmammalssmallcleveranimalshumanbeingWhatshouldwedoinordertoprotectourenvironment?HomeworkSupposeyouareaprofessorwhostudiesastronomy