【Anewstudyhasfoundnoevidencethatsunscreen,commonlyusedtoreducetheriskofskincancer,actuallyincreasestherisk.ResearchersfromtheUniversityofIowabasedtheirfindingsonareviewof18earlierstudiesthatlookedattheasso】

　　Anewstudyhasfoundnoevidencethatsunscreen,commonlyusedtoreducetheriskofskincancer,actuallyincreasestherisk.

　　ResearchersfromtheUniversityofIowabasedtheirfindingsonareviewof18earlierstudiesthatlookedattheassociationbetweensunscreenuseandmelanoma(黑素瘤)．Theysaidthattheyfoundfaultsinstudiesthathadreportedassociationsbetweensunscreenuseandhigherriskofmelanoma.

　　Mosthealthexpertsbelievethatbyprotectingtheskinfromtheharmfuleffectsofthesun,sunscreenhelpspreventskincancer,whichisincreasinginincidence(发生率)fasterthananyothercancerintheUnitedStates.

　　Butquestionshasbeenraisedaboutsunscreenandwhetheritmayhasoppositeeffect,perhapsbyallowingpeopletoremainexposedtothesunlongerwithoutburning.

　　Theresearcherssaidthatamongtheproblemswithsomeearlierstudiesisthattheyoftenfailedtotakeintoaccountthatthosepeoplemostatriskforskincancer---peoplewithfairskinandfreckles(雀斑),forexample---aremorelikelytousesunscreen．Asaresult,itmayappearthatsunscreenusersgetcancermoreoften.

　　Thestudies,whichgenerallyreliedonvolunteerstorecalltheirsunscreenuse,werealsounabletoprovehowwelltheproductshadbeenapplied,saidthenewstudy.

　　小题1:Peoplewithfairskinandfreckles .A．seldomusesunscreenB．aremoreindangerofskincancerC．canbefreefromtheharmofthesunD．oftenexposethemselvestothesun小题2:Wecanlearnfromthepassagethat .A．sunscreenusersgetskincancermoreoftenB．thevolunteershaveprovedtheeffectofsunscreenC．thenewstudywasbasedontheexperiencesofvolunteersD．thenumberofskincancerpatientsisincreasinginAmerica小题3:Whichofthefollowingcanbethebesttitleforthispassage?A．SunscreentoPreventSkinCancerB．SunscreentoIncreaseSkinCancerC．SkinCancerCausedbySunscreenD．SkinCancerCausedbyFreckles