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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.Theshortenedhibernationperiodcouldactuallyleadtosignificantdeclinesi
2、nthepopulationofseveralspecies.SomeofthefirstconcreteevidenceofthephenomenoncamefromColorado,whereresearchersattheRockyMountainBiologicallabhavebeenobservingmarmot(旱獭)hibernationbehaviorsincethe1970s.Intheearlydaysoftheirstudies,marmotsgenerallyhibernatedseveralwee
3、ksintothemonthofMay.Nowadays,however,temperaturesintheareahaverisenby2.5degreesFahrenheit,andthemarmotswakeupaboutamonthearlier.Atleastthemarmotsarestillhibernating.Severalotheranimalshavenotbeenhibernatingatallrecently.BrownbearsintheSpanishCantabrianMountainsdidn
4、othibernatelastyear.InpartsoftheUnitedStates,chipmunks(花鼠)alsoskippedthehibernationperiod.Thebearsseemtohavesurvivedwithoutlosingmanyindividuals.Thechipmunks,however,werenotsolucky.Manyoftheanimalsdiedofstarvationduringthewinter.Theproblemwithanimalswakingupearly,o
5、rskippinghibernationaltogether,lieswiththecreatures’metabolism(新陈代谢).Whentheanimalshibernate,theirmetabolismdropssignificantly.Theanimals’heartrateslows,andtheyrequireverylittleenergytolive.Whentheanimalsawakefromtheirwinterslumber,theirmetabolismreturnstonormal.Bu
6、twhiletheirmetabolismmaybeasactiveasitwasbeforehibernation,foodsourcesaren’tasavailableastheywerebefore.Amarmotmaywakeupwhentemperaturesgetwarmer,thinkingit’sspring,butplantswillnothavegottheamountofsuntheyneedtosignaltheirspringperiodofgrowth.Sountiltheplantsgrow,
7、themarmotshavenoreliablefoodsource.Manyscientistsbelievetheproblemwillcontinuetogetworse.Inadditiontochangesinhibernationpatterns,somebelievethatotheranimalswillalsobegintochangetheirmigrationpatternsorbegintogivebirthearlier.Formanybiologists,that’sascaryprospect.
8、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
