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1、科技英语文章ArcticMelt Earth'sNorthandSouthPolesarefamousforbeingcoldandicy.Lastyear,however,theamountoficeintheArcticOceanfelltoarecordlow1. Normally,icebuildsinArcticwatersaroundtheNorthPoleeachwinterandshrinksduringthesummer.Butformanyyears,theamountoficeleftbytheendofsummerhasbeendeclini
2、ng. Since1979,eachdecadehasseenan11.4percentdropinend-of-summericecover2.Between1981and2000,iceintheArcticlost22percentofitsthickness--becoming1.13metersthinner. Lastsummer,Arcticseaicereacheditsskimpiestlevelsyet.Bytheendofsummer2007,theicehadshrunktocoverjust4.2millionsquarekilometer
3、s.That's38percentlessareathantheaveragecoveratthattimeofyear.Andit'saverylarge23percentbelowthepreviousrecordlow,whichwassetjust2yearsago.Thiscontinuingtrendhasscientistsconcerned Theremaybeseveralreasonsfortheicemelt,saysJinlunZhang,anoceanographerattheUniversityofWashington3inSeattle.
4、UnusuallystrongwindsblewthroughtheArcticlastsummer.ThewindspushedmuchoftheiceoutofthecentralArctic,leavingalargeareaofthiniceandopenwater4. ScientistsalsosuspectthatfewercloudscovertheArcticnowthaninthepast.Clearerskiesallowmoresunlighttoreachtheocean.Theextraheatwarmsboththewaterandthe
5、atmosphere.InpartsoftheArcticOceanlastyear,surfacetemperatureswere3.5℃Celsiuswarmerthanaverageand1.5℃warmerthanthepreviousrecordhigh5. Withbothairandwatergettingwarmer,theiceismeltingfrombothaboveandbelow.InsomepartsoftheBeaufortSea6,northofAlaskaandwesternCanada,icethatmeasured3.3mthic
6、katthebeginningofthesummermeasuredjust50centimetersbyseason'send. Thenewmeasurementssuggestthatmeltingisfarmoreseverethanscientistshaveseenbyjustlookingaticecoverfromabove,saysDonaldK.Perovich,ageophysicistattheU.S.ArmyColdRegionsResearchandEngineeringLaboratoryinHanover,N.H.7 Somescie
7、ntistsfearthattheArcticisstuckinawarmingtrendfromwhichitmayneverrecover. 练习：1.Whichofthefollowingisclosestinmeaningtotheword"build"inthefirstsentenceofthesecondparagraph? A)Construct.B)Extend.C)Create.D)Expand. 2.WhatistheicecoverintheArcticbytheendof2007summer? A)4.2m
