Globalwarmingcouldmakehumans___36___warnscientistswho__37___tohavefound__38___thatitcausedtheworld’sfirsthorsestoshrinknearly50millionyearsago.

InfactateamfromtheuniversitiesofFloridaandNebraskasaysithasfounda__39___betweentheEarth__40___upandthesizeofmammals--horsesinthis__41__thelasttimetheworldheatedup.

Thescientistsusedfossilsto__42___the___43___ofhorsesfromtheirearliestappearance56millionyearsago.__44__temperatureswentuptheirsizewent__45__andviceversa（反之亦然）;atone__46__theywereassmallasahousecatsaidDrJonathanBlochcuratoroftheFloridaMuseumofNaturalHistorywasquotedbythe"DailyMail"assaying.

Thescientistssaythatthe__47___warmingcouldhavethesame__48__onmammals--and__49__evenmakehumanssmaller."Horsesstartedoutsmallaboutthesizeofasmalldog__50__aminiatureschnauzer(迷你型雪纳瑞犬).What`ssurprisingis__51__aftertheyfirstappearedtheythenbecameevensmallerandthen__52__increasedinsizeandthatexactly__53__totheglobalwarmingeventfollowedbycooling.

"Ithadbeenknownthatmammalsweresmallduringthattimeandthatitwaswarm__54__wehadn’tunderstoodthattemperaturespecificallywas__55__theevolutionofbodysize"DrBlochsaidinthe"Science"journal.

36．A.taller B.higher C.shorter D.bigger

37.A.announce B.claim C.declare D.broadcast

38.A.evidence B.result C.sign D.information

39.A.difference B.gap C.condition D.link

40.A.heating B.freezing C.cooling D.clearing

41.A.case B.way C.occasion D.direction

42.A.find B.follow C.date D.allocate

43.A.evolution B.exploration C.growth D.movement

44.A.With B.Because C.While D.As

45.A.up