小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.com小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.com选择性必修第四册UNIT1SCIENCEFICTIONⅠ.阅读理解Very，verylongago，dogsdidn’texist.Therewerejustwolvesofdifferentkinds.“Dogor”，an18，000-year-oldpuppy，wasfoundfrozeninthepermafrostinSiberianearYakutsk.PermafrostisalayerofgroundinArcticandAntarcticareasthatremainsfrozen.Recently，areasofpermafrostarethawing(解冻)astheworldhaswarmed，anduncoveringsecretslongburiedandfrozen.Dogorcameoutofthegroundcoveredwithmudandice，butscientistscarefullycleanedhim.Hishead，includinghisnose，hair，eyelashes，andamouthfullofyoungteeth，isstillverymuchlikeitwaswhenhedied.ScientistsfromSwedenhavetestedhimcarefully.Theirtestsshowedthatthepuppylived18，000yearsago，thatitwasamale，andthatitwasabouttwomonthsoldwhenitdied.ButeventhoughthescientistsrantwoDNAteststodiscoverwhetherDogorwasadogorawolf，theydidn’tgetwhattheywanted.Thescientistssaythatnormallyit’sfairly“easytotellthedifference”.TheynowplanondoingathirdDNAtest.Inanycase，theresultswillteachscientistsalotaboutthehistoryofdogsandwhentheybegantoseparatefromwolves.“Wecan’twaittogetresultsfromfurthertests，”saidSergeyFedorov，oftheMammothMuseumofNorth-EasternFederalUniversity.Somepeoplebelievewemaysoongetevenmoreinformationaboutveryoldanimals.Duetotheclimatechange，theworld’stemperaturehasgoneupby1℃，whichhasledtoheatwaves，recorddryperiods，wildfires，recordrains，andmorestronghurricanes.SincethepermafrostinSiberiaandotherareasisthawing，it’spossiblethatevenmoreanimalswillbefound，whichcouldhelpscientistslearnmoreaboutearlyhistory.1.What’sspecialaboutDogor?小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.com小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.comA.It’stheworld’searliestdog.B.Itsurvivedextremecold.C.Ithasshownmanysecrets.D.Itispreservedperfectly.2.WhichwordcanbestdescribetheresultofthestudyonDogor?A.Uncertain.B.Satisfying.C.Unreliable.D.Challenging.3.Whatdoestheauthorwanttoconveyinthelastparagraph?A.Theriseoftemperaturebenefitsanimalstudies.B.Animalsaresufferingfromnaturaldisasters.C.Theclimateisworsening.D.Scientistscallonpeopletoprotectancientanimals.4.Whereisthetextmostlikelyfrom?A.Asciencemagazine.B.Abiologytextbook.C.Anovelaboutanimals.D.Areportaboutweather.ChemicalengineersatUNSWSydneyhavefoundawaytomake“green”ammonia(氨)fromair，waterandrenewableelectricity.InapaperpublishedinEnergy&EnvironmentalScience，theauthorssaythatammoniasynthesis(合成)wasoneofthecriticalachievementsofthe20thcentury.Whenusedinfertilisersthatsignificantlyincreasetheoutputoffoodcrops，itcouldenableagriculturetosustainanever-expandingglobalpopulation.Butsincethebeginningofthe1900swhenitwasfirstemployed，productionofammoniahasbeenenergy-intensive—requiringtemperatureshigherthan400℃andpressuresgreaterthan200atm—andallpoweredbyfossilfuels.Dr.EmmaLovell，aco-authorofthepaperfromUNSW，saysthetraditionalwaytomakeammonia，小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.com小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.comknownastheHaber-Boschprocess，isonlycost-effectivewhenitisproducedonamassivescaleduetothehugeamountsofenergyandexpensivematerialsrequiredandthatitproducesmoreCO2thananyotherchemical-makingreaction.“In...