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1、2019-2020年高考英语二轮复习阅读理解选练（5）(IV)【xx模拟】阅读理解。请认真阅读下列短文,从短文后各题所给的A.B.C.D四个选项中,选出最佳选项。ScientistsfromtheUniversityofEastAngliahaveidentifiedfournewman-madegasesthatarecontributingtothedamagetotheozone(臭氧)layer.Twoofthegasesareaccumulatingataratethatiscausingc
2、oncernamongresearchers.Worriesoverthegrowingozoneholehaveseentheproductionofchlorofluorocarbon(CFC)gasesrestrictedsincethemid1980s.Butthepreciseoriginofthesenew,similarsubstancesremainsamystery.Lyingintheatmosphere,theozonelayerplaysacriticalroleinblock
3、ingharmfulUVrays,whichcausecancersinhumansandreproductiveproblemsinanimals.ScientistsfromtheBritishAntarcticSurveywerethefirsttodiscoverahuge"hole"intheozoneoverAntarcticain1985.TheevidencequicklypointedtoCFCgases,whichwereinventedinthe1920s,andwerewide
4、lyusedinrefrigeration.Extraordinarily,globalactionwasrapidlyagreedtodealwithCFCsandtheMontrealProtocoltolimitthesesubstancescameintobeingin1987.Atotalglobalbanonproductioncameintoforceinxx.Now,thenewlydiscoveredfournewgasescandestroyozoneandaregettingin
5、totheatmospherefromasyetunidentifiedsources.ThreeofthegasesareCFCsandoneisahydrochlorofluorocarbon(HCFC),whichcanalsodamageozone.Theresearchhasshownthatfourgaseswerenotaroundintheatmosphereatalluntilthe1960s,whichsuggeststheyareman-made.Thescientistsdis
6、coveredthegasesbyanalyzingpolarsnowpack.Airfromthissnowisanaturalarchiveofwhatwasintheatmosphereupt0100yearsago.Theresearchersalsolookedatmodernairsamples,collectedatremoteCapeGriminTasmania.Theyestimatethatabout74,000tonnesofthesegaseshavebeenreleasedi
7、ntotheatmosphere.Twoofthegasesareaccumulatingatsignificantrates.However,theydon'tknowwherethenewgasesarebeingreleasedfromandthisshouldbeinvestigated.Possiblesourcesincludechemicalsforinsecticide（杀虫剂）productionandsolvents（溶液）forcleaningelectronicponents.
8、ThethreeCFCsarebeingdestroyedveryslowlyintheatmosphere-soevenifemissions（散发）weretostopimmediately,theywillstillbearoundformanydecadestoe.Ofthefourspeciesidentified,CFC-113aseemsthemostworryingasthereisaverysmallbutgrowingemission
