unit 4 astronomy

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1、Unit4Astronomy:thescienceofthestarsWarmingUpWheredowelive?海王星Saturn水星Uranus金星Venus地球Earth火星Mars木星Mercury土星Jupiter天王星NeptuneHowLifeBeganontheEarthReadingListentothetapeandfinishthe5questions.1.Howwerestarsandotherbodiescreated?A.Atomscombinedtocreatethem.B.Cloudsofdustcombinedtocreatethem.

2、C.Watercombinedtocreatethem.2.Whichisthemostimportantforlifeappearingontheearth?A.FireB.RockC.Water3.Itcanbeknownfromthepassagethat()A.PlantsappearedlaterontheearththananimalsB.Earlyshellfishappearedearlierthanplants.C.Animalsappearedlaterontheearththanplants.4.Howmanyyearsdiddinosaursexi

3、stontheearth?A.Morethan140billionyears.B.Morethan140millionyears.C.Morethan140thousandyear.5.Whycantheearthbecometoohottoliveon?A.Smallcleveranimalsproducemoreheat.B.Smallcleveranimalsproducetoomuchcarbondioxide.C.Smallcleveranimalsdon’twantheattoescapefromtheearth.CloseReadingI.Readthepa

4、ssagecarefullyandwritedownthemainideaforeachparagraph.Para.1Awidelyacceptedtheoryabouttheformationoftheuniverse.Para.2Theformation(形成)oftheearth.Howdidtheearthform?1.Acloudofdust2.Asolidglobe.3.Explodedwithfireandrock.4.Producecarbon,nitrogen,watervapourandothergases.5.Theearth’satmospher

5、e.Para.3Theimportanceofwaterforlife.Para.4Thedevelopmentofplantsandanimalsontheearth.Theorderoflifeforms1.Plantsinthewater2.Shellfishandfish3.Plantsonland4.Insects﹠amphibians5.Reptiles6.Dinosaurs7.MammalsPara.5Thearrivalofhumansandtheirimpactontheearth.Ⅱ.Putthefollowingsentencesintorighto

6、rder.1.Insectsandamphibiansappeared.3.Theearthbecameasolidball.5.Reptilesappeared.7.Theearthwasacloudofdust.9.Shellfishandotherfishappeared.11.Cleveranimalswithhandsandfeetappeared.2.Dinosaursappeared.4.Smallplantsgrewonthewater.6.Plantsbegantogrowondryland.8.Waterappearedontheearth.10.Th

7、euniversebeganwitha"BigBang".12.Mammalsappeared.Order:107384961521211Ⅲ.Discussthefollowingquestionswithyourpartners.Whywastheearthdifferentfromotherplanets?Thewaterremained.2.Whydidtheplantsgrowbeforetheanimalscame?Becauseplantsprovideoxygenforanimalstobreathe.3.Wha