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1、www.kaobo100.com中国考博辅导首选学校武汉理工大学考博英语模拟真题及其解析Text1Intheatmosphere,carbondioxideactsratherlikeaone-waymirror--theglassintheroofofagreenhousewhichallowsthesun’sraystoenterbutpreventstheheatfromescaping.Accordingtoaweatherexpert’sprediction,theatmospherewillbe3℃warmerintheyear2050thanit
2、istoday,ifmancontinuestoburnfuelsatthepresentrate.Ifthiswarminguptookplace,theicecapsinthepoleswouldbegintomelt,thusraisingsealevelseveralmetresandseverelyfloodingcoastalcities.Also,theGengduoyuanxiaowanzhengkaoboyingyuzhentijiqijiexiqinglianxiquanguomianfeizixundianhua:silinglingli
3、uliubaliujiuqiba,huojiazixunqq:qiqierliuqibawusanqiincreaseinatmospherictemperaturewouldleadtogreatchangesintheclimateofthenorthernhemisphere,possiblyresultinginanalterationofearth’schieffood-growingzones.Inthepast,concernaboutaman-madewarmingoftheearthhasconcentratedontheArcticbeca
4、usetheAntarcticismuchcolderandhasamuchthickericesheet.ButtheweatherexpertsarenowpayingmoreattentiontoWestAntarctic,whichmaybeaffectedbyonlyafewdegreesofwarming,inotherwords,byawarmingonthescalethatwillpossiblytakeplaceinthenextfiftyyearsfromtheburningoffuels.Satellitepicturesshowtha
5、tlargeareasofAntarcticicearewww.kaobo100.com中国考博辅导首选学校alreadydisappearing.Theevidenceavailablesuggeststhatawarminghastakenplace.Thisfitsthetheorythatcarbondioxidewarmstheearth.However,mostofthefuelisburntinthenorthernhemisphere,wheretemperaturesseemtobefalling.Scientistsconclude,the
6、refore,thatuptonownaturalinfluencesontheweatherhaveexceededthosecausedbyman.Thequestionis:Whichnaturalcausehasmosteffectontheweather?Onepossibilityisthevariablebehaviorofthesun.Astronomersatoneresearchstationhavestudiedthehotspotsand“cold”spots(thatis,therelativelylesshotspots)onthe
7、sun.Asthesunrotates,every27.5days,itpresentshotteror“colder”facestotheearth,anddifferentaspectstodifferentpartsoftheearth.Thisseemstohaveaconsiderableeffectonthedistributionoftheearth’satmosphericpressure,andconsequentlyonwindcirculation.Thesunisalsovariableoveralongterm:itsheatoutp
8、utgoesupanddownincy
