【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