阅读理解。Anewstudyhasfoundnoevidencethatsunscreen,commonlyusedtoreducetheriskofskincancer,actuallyincreasestherisk.ResearchersfromtheUmversityofIowabasedtheirfindingsonarevicwof18earliers
阅读理解。 Anewstudyhasfoundnoevidencethatsunscreen,commonlyusedtoreducethe
riskofskincancer,actuallyincreasestherisk.
ResearchersfromtheUmversityofIowabasedtheirfindingsonarevicwof18earlier
studiesthatlookedattheassociationbetweensunscreenuseandmelanoma(黑素瘤).
Theysaidthattheyfoundflawsinstudiesthathadreportedassociationsbetweensunscreen
useandhigherriskofmelanoma.
Mosthealthexpertsbelievethatbyprotectingtheskinfromtheharmfuleffectsof
thesun,sunscreenhelpspreventskincancer,whichisincreasinginincidence(发生率)
fasterthananyothercancerintheUnitedStates.
Butquestionshavebeenraisedaboutsunscreenandwhetheritmayhavetheopposite
effect,perhapsbyallowingpeopletoremainexposedtothesunlongerwithoutburning.
Theresearcherssaidthatamongtheproblemswithsomeearlierstudiesisthatthey
oftenfailedtotakeintoaccountthatthosepeoplemostatriskforskincancer-people
withfairskinandfreckles(雀斑),forexample-aremorelikelytousesunscreen.Asa
result,itmayappearthatsunscreenusersgetcancermoreoften.
Thestudies,whichgenerallyreliedonvolunteerstorecalltheirsunscreenuse,were
alsounabletoprovehowwelltheproductshadbeenapplied,Saidthenewstudy.
1.Theunderlinedword"flaws"inthe2ndparagraphmostprobablymeans________.A.evidences
B.facts
C.faults
D.failures2.Peoplewithfairskinandfreckles________.A.seldomusesunscreen
B.aremoreindangerofskincancer
C.canbefreefromtheharmofthesun
D.oftenexposethemselvestothesun3.Wecanlearnfromthepassagethat_______.A.sunscreenusersgetskincancermoreoften
B.thevolunteershaveprovedtheeffectofsunscreen
C.thenewstudywasbasedontheexperiencesofvolunteers
D.thenumberofskincancerpatientsisincreasinginAmerica4.Whichoft