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1、Unit1EncyclopaediaLookitup!Herearetwoarticlesfromanencyclopaedia.DaVinci,LeonardoLeonardodaVinci(1452—1519)wasanItalianpainter,inventor,musician,engineerandscientist.DaVinciwasborninthecountryside.Fromanearlyage,heshowedgreatintelligenceandartisticability.Ashegrewolder,h
2、elearnttodomanydifferentthings.Hispaintingsareveryfamous,andone,theMonaLisa,isperhapsthemostfamouspaintingintheworld.Healsohadmanyinventions.Forexample,hisnotebooksincludesomeinterestingdrawingsofflyingmachines.(SeeArt)DinosaursDinosaurslivedonEarthmorethan60millionyears
3、beforehumanbeings.TheylivedeverywhereonEarth.Somedinosaurswereassmallaschicken.Otherswereasbigastenelephants.Somecouldevenfly.Manydinosaursateplants.However,somedinosaurslikedtoeatmeat.DinosaurslivedonEarthformorethan150millionyears.Then,suddenly,theyalldiedout.Nobodykno
4、wswhy.However,wecanlearnaboutthemfromtheirfossils.(SeeEarthhistory)8Unit2NumbersThekingandthericeAlongtimeago,therewasakinginIndia.Theking’sfavouritegamewaschess.Oneday,awiseoldmancametothepalaceandthekingchallengedhimtoagame.Thekingpromisedtheoldman,“Youcanhaveanyprizei
5、fyouwinthegame.”Theoldmansaid,“IfIwinthegame,I’dlikeonegrainofriceforthefirstsquareofthechessboard,twoforthesecond,fourforthethird,andthendoubletheamountforeachoftherestsquares.”“Isthatall?”askedtheking.“Wouldn’tyoulikegoldorsilverinstead?”“No,justrice,”repliedtheoldman.
6、Thekingandtheoldmanplayedthegameforalongtime.Finally,theoldmanwon.Sothekingorderedhismentocollectabagofrice.Heputonegrainonthefirstsquare,twoonthesecond,andsoon.Thekingquicklyrealizedtheproblem--evenwithallthericeinthecountry,hewouldstillnothaveenoughricetoputonallthesqu
7、ares!8Unit3ComputersComputerfactsSmallerandbetterInthe1940s,thefirstcomputerswerebiggerthancars.Nowcomputersarebecomingsmallerandbetter.Somecomputersaretiny.Youmaybeunawareofthem.ThereisprobablyoneinsideyourTVorwashingmachine.Youdependoncomputersmorethanyourealize.Whatca
8、nwedowithcomputers?Wecanusecomputerstocalculate.Theycancalculateatafasterspeedthanwecanandalmostnevergi
