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1、2019-2020年高考英语完形填空和阅读理解选练1阅读理解。 Nowscientistsbelievethatglobalwarmingaffectshibernatinganimals,causingthemtowakeupearlier.Whilethismayseemalittleconcern,itisinfactasignificantenvironmentalproblem.Theshortenedhibernationperiodcouldactuallyleadtosignificantdeclinesinthepopulationofseveralspecies.So
2、meofthefirstconcreteevidenceofthephenomenoncamefromColorado,whereresearchersattheRockyMountainBiologicallabhavebeenobservingmarmot(旱獭)hibernationbehaviorsincethe1970s.Intheearlydaysoftheirstudies,marmotsgenerallyhibernatedseveralweeksintothemonthofMay.Nowadays,however,temperaturesintheareahaverise
3、nby2.5degreesFahrenheit,andthemarmotswakeupaboutamonthearlier.Atleastthemarmotsarestillhibernating.Severalotheranimalshavenotbeenhibernatingatallrecently.BrownbearsintheSpanishCantabrianMountainsdidnothibernatelastyear.InpartsoftheUnitedStates,chipmunks(花鼠)alsoskippedthehibernationperiod.Thebearss
4、eemtohavesurvivedwithoutlosingmanyindividuals.Thechipmunks,however,werenotsolucky.Manyoftheanimalsdiedofstarvationduringthewinter.Theproblemwithanimalswakingupearly,orskippinghibernationaltogether,lieswiththecreatures’metabolism(新陈代谢).Whentheanimalshibernate,theirmetabolismdropssignificantly.Thean
5、imals’heartrateslows,andtheyrequireverylittleenergytolive.Whentheanimalsawakefromtheirwinterslumber,theirmetabolismreturnstonormal.Butwhiletheirmetabolismmaybeasactiveasitwasbeforehibernation,foodsourcesaren’tasavailableastheywerebefore.Amarmotmaywakeupwhentemperaturesgetwarmer,thinkingit’sspring,
6、butplantswillnothavegottheamountofsuntheyneedtosignaltheirspringperiodofgrowth.Sountiltheplantsgrow,themarmotshavenoreliablefoodsource.Manyscientistsbelievetheproblemwillcontinuetogetworse.Inadditiontochangesinhibernationpatterns,somebelievethatotheranimalswillalsobegintochangetheirmigrationpatter
7、nsorbegintogivebirthearlier.Formanybiologists,that’sascaryprospect.TerryRoot,ananimalexpertatStanfordUniversity,said,“Idothinkwhatwewillbefacingistheextinctionofmanyspecies.”【文章大意】全球变暖带来的连锁反应是多方面的,其中之一就是导致一些冬眠动物的
