题目内容：
Questionsarebasedonthefollowingpassage.
Goodnewsfortheozone(臭氧)layerabovetheArctic.The"MontrealProtocol(议定书)"isshowingeffects:accordingtorecentmeasurements,theozonelayerovertheNorthPoleshouldrecoverbytheendofthecentury.ThisisoneofthemainfindingsoftheEUprojectRECONCILE,whichwascompletedinFebruary2013.Germanscientistsandtheircolleaguesfrom35researchinstitutionsanduniversitiesin14countriesspentfouryearsinvestigatingthechemicalprocessofozoneloss.Theirfindingsverifiedonceagainthatchlorine(氯)compoundsareindeedresponsibleforthis.Thescientistsusedthenewinsightstoimproveexistingclimatemodels.Thesemodelsfacilitatemorereliablepredictionsonhowtheozonelayerwilldevelopinfutureandonthepossibleconsequencesofclimatechangeforthestratosphere(平流层).
"Eveniftheozonelayerrecovers,climatechangecouldaltertheunderlyingconditions.Thisisyetanotherreasontoreducegreenhousegasemissionsandstopclimatechange,"emphasizesenvironmentalchemistDr.MarcyonHobe.Climatechangecouldalterthetemperature,circulationpattemsandchemicalcompositioninthestratosphere.Thisalsoinfluencestheozonelayer,whichinturnhasabearingontemperature.Furthermore,possibleventurestosoftenclimatechangecouldhaveanegativeimpactontheozonelayer.Oneexampleistheso-calledGeoengineering.ThetermdescribestheuseoftechnologicalmeanstointerfereinthegeochemicalorbiogeochemicalprocessesoftheEarth.
AstudypublishedaroundsixyearsagoindirectlycalledintoquestiontheroleofCFCsandtheProtocol."Intheproject,wesuccessfullyansweredsomeoftheopenquestionsregardingozoneloss,andwedemonstratedthatbesidesthedestructioncausedbychlorine,noadditionalchemicalmechanismsplayacriticalrole,"saysMarcvonHobe.Analysesofairsamplesshowedacleardecreaseinstratosphericchlorine.Althoughthesecompoundsremainintheatmospherelongerthanpreviouslythought,thescientistsexpecttheozonelayertorecoverbytheendofthecentury.
Whatdoweknowaboutthegoodnewsfortheozonelayer? A．ItisamainfindingofaUNproject.
B．ItistheeffectoftheMontrealProtocol.
C．Itsaystheozonelayerhasrecoveredcompletely.
D．Itsaystheozonelayerwillrecoverinadecade.
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