2017年职称英语综合类C级概括大意模拟题

2017年职称英语综合类C级概括大意模拟题(29)ArcticMeltEarth'sNorthandSouthPolesarefamousforbeingcoldandicy.Lastyear,however,theamountoficeintheArcticOceanfelltoarecordlow1.Normally,icebuildsinArcticwatersaroundtheNorthPoleeachwinterandshrinksduringthesummer.Butformanyyears,Since1979,eachdecadehasseenan11.4percentdropinend-of-summericecover2.Between1981and2000,iceintheArcticlost22percentofitsthickness--becoming1.13metersthinner.Lastsummer,Arcticseaicereacheditsskimpiestlevelsyet.Bytheendofsummer2007,theicehadshrunktocoverjust4.2millionsquarekilometers.That's38percentlessareathantheaveragecoveratthattimeofyear.Andit'saverylarge23percentbelowthepreviousrecordlow,whichwassetjust2yearsago.Thiscontinuingtrendhasscientistsconcerned.Theremaybeseveralreasonsfortheicemelt,saysJinlunZhang,anoceanographerattheUniversityofWashington3inSeattle.UnusuallystrongwindsblewthroughtheArcticlastsummer.ThewindspushedmuchoftheiceoutofthecentralArctic,leavingalargeareaofthiniceandopenwater4.ScientistsalsosuspectthatfewercloudscovertheArcticnowthaninthepast.Clearerskiesallowmoresunlighttoreachtheocean.Theextraheatwarmsboththewaterandtheatmosphere.InpartsoftheArcticOceanlastyear,surfacetemperatureswere3.5℃Celsiuswarmerthanaverageand1.5℃warmerthanthepreviousrecordhigh5.Withbothairandwatergettingwarmer,theiceismeltingfrombothaboveandbelow.InsomepartsoftheBeaufortSea6,northofAlaskaandwesternCanada,icethatmeasured3.3mthickatthebeginningofthesummermeasuredjust50centimetersbyseason'send.Thenewmeasurementssuggestthatmeltingisfarmoreseverethanscientistshaveseenbyjustlookingaticecoverfromabove,saysDonaldK.Perovich,ageophysicistattheU.S.ArmyColdRegionsResearchandEngineeringLaboratoryinHanover,N.H.7SomescientistsfearthattheArcticisstuckinawarmingtrendfromwhichitmayneverrecover.词汇：Arcticn.北极，北极圈；adj.北极的theArcticOcean北冰洋shrinkv.萎缩；缩小，减少oceanographern.海洋学家skimpyadj.缺乏的，不足的centimetern.厘米geophysicistn.地球物理学家注释中华考试网1.felltoarecordlow:跌到历史最低点。record作形容词时，意思是“空前的，创记录的”。Recordlow的反义词是recordhigh:历史点。2.icecover:冰覆盖量3.UniversityofWashington:华盛顿大学，创建于l861年，座落在美国华盛顿州西雅图市东北角，所以又称西雅图华盛顿大学，是美国着名的公立研究型大学。4.openwater:没有冰覆盖的海面5.recordhigh:见注释