英语课件：人教版必修三Unit4SectionⅠ

Unit4Astronomy：thescienceofthestarsSectionⅠWarmingUp&Reading—Preparing预习多维感知SectionⅠ预习多维感知►StepOne：AskandDiscussion1．Doyouknowhowmanyplanetscirclearoundthesuninoursolarsystem?__________________________________________________________答案：Venus(金星)；Earth(地球)；Mars(火星)；Mercury(水星)；Jupiter(木星)；Saturn(土星)；Uranus(天王星)；Neptune(海王星)2．Eachreligionandculturehasitsownideasabouthowlifebeganonearth.Whatdoyouknow?________________________________________________________________________答案：InChina，weallknowthatPanguseparatestheskyfromtheearth.Inwesternculture，Godcreatedtheworldinsixdays.Manyscientistsbelievethattheuniversebeganwithahugeexplosioncalledthe“BigBang”．►StepTwo：FastReadingScanthetextandthenchoosethebestansweraccordingtothetext.1．Whatisthecorrectorderaccordingtothetext?①Thecleveranimalswithhandsandfeetappearedandspreadallovertheearth.②The“BigBang.”③Smallplantsbegantoappearonthesurfaceofthewater.④65millionyearsago，theageofthedinosaursended.A．②①③④B．④③②①C．②④③①D．②③④①答案：D2．Howdidtheatmosphereontheearthappear?A．Itcamefromspace.B．Itcamefromtheexplosion.C．Itcamefromtheoceans.D．Itcamefromtheforests.答案：B3．Inoursolarsystem，whydoeslifeonlyexistontheearth?A．Becauseitisverywarmontheearth.B．Becauseitiscoolenoughontheearth.C．Becausethereisplentyofwaterontheearth.D．Becauseitisbigenough.答案：C4．Whydidplantsappearearlierthananimals?A．Becauseplantscouldproduceoxygen，whichwasimportantforanimals.B．Becauseplantsweremoreadvancedthananimals.C．Becauseanimalsneededmorewater.D．Becauseplantsneededmorewater.答案：A5．Accordingtothepassagewecanknow________.A．onlytheearthhaslifeonitinspaceB．oxygenintheatmosphereontheearthcamefromthe“BigBang”C．humansarethecleverestanimalsoftheearthD．plantsplayedanimportantpartintheappearanceofanimals答案：D►StepThree：CarefulReading1．Readthetextcarefullyandthenanswerthefollowingquestions.(1)Whywastheearthdifferentfromotherplanets?___________________________________________答案：Becausethewaterremainedontheearth.(2)Whydidtheplantsgrowbeforetheanimalscame?___________________________________________答案：Becauseplantsprovidedoxygenforanimalstobreathe.(3)Whyisitwronginfilmsandstoriestoshowdinosaursandpeopletogether?___________________________________________答案：Becausedinosaursdiedoutlongbeforehumanbeingsdevelopedontheearth.2．Readthetextandmatcheachparagraphwithitsmainidea.Paragraph1()A.Howhumansappearedandwhateffectstheyhavecausedtotheearth.Paragraph2()B.Waterisveryimportantforlifeontheearth.Paragraph3()C.Howtheearthformed.Paragraph4()D.Howtheplantsandanimalsontheearthdeveloped.Paragraph5()E.Itiswidelyacceptedthattheuniversebeganwitha“BigBang”．答案：ECBDA3．Readthetextandwritedownthemainideaofit.Thetextmainlytellsusthe________oftheearthandthe________oflifeonit.答案：formation；development►StepFour：SummaryReadthetextcarefullyandfillintheblanks.Theearthwasjustacloudof1.____________afterthe“BigBang”．Theearth2.____________loudlywithfireandrock.Theywerein3.____________toproducemanythings，whichweretomaketheearth’satmosphere.Astheearthcooleddown，waterbegantoappearonitssurface.Itallowedtheearthtodissolve4.____________gases.Thenlifebegantodevelop.Thefirstsmallplants5.____________andfilledtheoceansandseaswithoxygen.Thisencouragedthe6.____________ofearlyshellfishandfish.Landanimalssuchasinsects，reptilesanddinosaursandsoonappearedaftergreenplantsappeared.Smallcleveranimals7.____________allovertheearth.Theyareputtingtoo8.____________carbondioxideintotheatmosphere，which9.____________heatfromtheearthintospace.Whetherlifewillcontinueontheearthformillionsofyearstocomewill10.____________onwhetherthisproblemcanbesolved.答案：1.dust2.exploded3.time4.harmful5.multiplied6.development7.spread8.much9.prevents10．depend►StepFive：Discussion1．Whatproblemshavebeencausedbyhumanstotheearth?______________________________________________________2．Asastudent，whatlittlethingscanwedofortheearth?______________________________________________________________________________________本部分内容讲解结束点此进入课件目录按ESC键退出全屏播放谢谢使用