职称英语历年真题《理工C》阅读理解

职称英语历年真题《理工C》阅读理解精选 不少考生开始备考xx年，为了帮助大家更好地备考职称英语考试，以下是网的关于职称英语历年真题《理工C》阅读理解精选，供大家备考。 　New research f

职称英语历年真题《理工C》阅读理解精选 不少考生开始备考xx年，为了帮助大家更好地备考职称英语考试， 以下是网的关于职称英语历年真题《理工C》阅读理解精选，供大 家备考。 NewresearchfromNASAscientistssuggestsemissionsof blacksootalterthewaysunlightreflectsoffsnow. Aordingtoaputersimulation,blacksootmaybe responsiblefor25percentofobservedglobalwarmingover thepastcentury. Sootinthehigherlatitudes(纬度)oftheEarth,where iceismoremon,absorbsmoreofthesun'senergyand warmththananicy,whitebackground.Dark-coloredblack carbon,orsoot,absorbssunlight,whilelightercoloredice reflectssunlight. Sootinareaswithsnowandicemayplayanimportant roleinclimatechange.Also,ifsnowandicecoveredareas beginmelting,thewarmingeffectincreases,asthesoot beesmoreconcentratedonthesnowsurface."Thisprovides apositivefeedback,asglaciersandicesheetsmelt,they tendtogetevendirtier,"saidDr.JamesHansen,a researcheratNASA'sGoddardInstituteforSpaceStudies, NewYork. Hansenfoundsoot'seffectonsnowalbedo(反照率), whichmaybecontributingtotrendstowardearlyspringsin theNorthernHemisphere,suchasthinningArcticseaice