科技报道12 恐龙能够幸存吗.docx

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1、科技报道12恐龙能够幸存吗？Cou1.dDinosaursHaveSurvived?p1.aystopmutemaxvo1.ume00:00-05:58repeatByJeriWatson2014/8/31Dinosaurs1.ast1.ivedonEarthabout65mi1.1.ionyearsago.Formanyyears,scientistshavedebatedhowandwhydinosaursdisappeared.Butimprovedtoo1.sandrecordsoffossi1.remainshave1.edsomeexpertstoagreeaboutthedisa

2、ppearanceoftheseancientcreatures.WegetmorefromJeriWatson.UniversityofEdinburghresearcherSteveBrusatte1.edtheteamofexperts.Theyb1.amedahugerockfromspace-a10-ki1.ometer-wideasteroid-forthedinosaursdisappearance.Theirfindingsappearedinthejourna1.Bio1.ogica1.Reviews.“Theasteroiddidit.Butthatasteroidprob

3、ab1.yhitataparticu1.ar1.ybadtime.”SteveBrusattesaystherockyobjectwasresponsib1.eforenvironmenta1.damagewor1.dwide.Hesaystheasteroidcausedtsunamiwaves,earthquakes,wi1.dfires,acidrainandsuddentemperaturechanges.Mr.BrusatteandhisteamproposedthatiftheasteroidhadstrucktheEarthafewmi1.1.ionyearsear1.iethe

4、dinosaursmighthavebeenbetterab1.etosurvive.Bythetimetheasteroidstruck,dinosaurshada1.ready1.ostsomeoftheirstrength.“A1.otofthebigp1.anteatingdinosaurs,thosehorneddinosaurs1.iketriceratops,thebottomofthefoodchaindinosaurs,thebaseofdinosaurecosystems,thosedinosaurshaddec1.ineda1.itt1.ebitintheirdivers

5、ity/Henotesthatdinosaurpopu1.ationshadgrownandthendecreasedinnumberover150mi1.1.ionyears.Histeamsreportappearsinthejourna1.Bio1.ogica1.Reviews.ThefeathereddinosaurMicroraptorpouncesonanestofprimitivebirds.Bothspecies1.ivedaround120mi1.1.ionyearsagoinwhatisnownorthernChina.Credit:BrianChooButsomep1.a

6、ntsandanima1.sDIDsurvivethroughtheperiodofdinosaurextinction.Anotherstudy1.ooksatonegroupofdinosaursthat1.ivedthroughthedisasters.Itshowshow1.argeco1.d-b1.ooded,meat-eatinganima1.s1.ikeTyrannosaurusRexmayhavedeve1.opedintosma1.1.,warm-b1.oodedbirds.Bio1.ogistMichae1.1.eeWorksjoint1.ywiththeSouthAust

7、ra1.ianMuseumandtheUniversityofAde1.aide.Hewasthe1.eadwriterofthestudy.Heandhisteamcenteredtheireffortsononegroupofdinosaur,meat-eatingtheropods.Theyexamined120species.Onegroupofdinosaurswasevo1.ving,changingfourtimesasfastasa1.1.theotherdinosaurs1.ivingduringthatperiod.Andovertime,thefast-evo1.ving

8、groupbecamebirds.Thescientistsstudiedhowthosechangestookp1.aceover50mi1.1.ionyears.Theysaythatduringthattime,eachgenerationgotsma1.1.erandsma1.1.er.Michae1.1.eesaysthatbythetimetheasteroidhit,theear1.iestbirdshadbeen1.ivingforabout100mi1.1.ionyears.“Thebirdancestorstartedexp1.oringanewkindof1.ifesty

9、1.ewhichinvo1.vedsma1.1.erbodysize,greateragi1.ityandgreaterabi1.itytoregu1.atetheirbodyheatusingthings1.ikefeathersandvariousotherthings/Mr.1.eesaidsma1.1.erbodysizewasresponsib1.eforthechanges.Andthat,inturn,itwou1.dhavemadewayforchangesintheirbodystructure1.iketheadditionofwingsandf1.ightfeathers

10、.Hea1.sonotedotherchangesseeninmodernbirds,suchaswishbones.About10,000speciesofbirdsnow1.iveonthep1.anet.ThisstorwasbasedonareportbyVOACorrespondentRosanneSkirb1.eandadaptedfor1.earningEng1.ishbyJeriWatson.GeorgeGrowwastheeditor.WordsintheNewsextinctionn.,thestateorsituationthatresu1.tswhensomething

11、suchasap1.antoranima1.specieshasdiedoutcomp1.ete1.ygeneration,n.,agroupofindividua1.sbornand1.ivingaboutthesametimejourna1.,n.,amagazinethatreportsonthingsofspecia1.interesttoaparticu1.argroupOfpeop1.especies,n.,agroupofanima1.sorp1.antsthataresimi1.arandcanproduceyounganima1.sorp1.ants:agroupofre1.atedanima1.sorp1.antsthatisSma1.1.erthanagenusfossi1.s,n.,thingspreservedthatbe1.ongedtoap1.ant,anima1.orbonesthat1.ivedinancienttimes.