题目内容：
回答题：GivingUpSmoking
Anumberofdevicesareavailabletohelpapersonquitsmoking.Nicotine（尼古丁）patchesaresmall,nicotine-containingadhesive（粘着性的）discsappliedtotheskin.Thenicotineisslowlyabsorbedthroughtheskinandentersthebloodstream.Overtime,thenicotinedoseisreducedandeventuallythedesirefornicotineiseased.Nicotinegumworksinasimilarmanner,providingsmalldosesofnicotinewhenchewed.
Thebenefitsofgivingupsmokingincludetheimmediatereductionofharmtothehealthofthesmokingandeasilyadmissiontosocialactivitiesandinstitutionsthatbansmoking.Ina1988report,theU.S.SurgeonGeneraldeclaredcigarettesmokingtobemoreharmfulandexpensivethantheuseofcocaine（可卡因）,alcohol,orheroin.Recentevidencesupportsthisclaim.
TheUnitedStatesgovernmenthascollectedaspecialtaxoncigarettesforseveraldecades.Theraterosefrom8centsperpackof20cigarettesin1951to24centsperpackin1993.Inotherdevelopedcountries,thecigarettetaxrateismuchhigher,rangingfrom50percentinSwitzerlandto85percentinDenmark.
IntheUnitedStates,thefirstdirectactiontochecksmokingwastheregulationofawarmingoncigarettepackagesbytheFederalTradeCommission.Thiswarningtookeffectin1964andwasstrengthenedin1969toread:“Warning:TheSurgeonGeneralHasDeterminedThatCigaretteSmokingIsDangeroustoYourHealth.
In1971allcigaretteadvertisingwasbannedfromradioandtelevision,andcitiesandstatespassedlawsrequiringnonsmokingsectionsinpublicplacesandworkplaces.
Which of the following can help a person quit smoking? A．Using nicotine patches.
B．Reading cigarette advertisements.
C．Chewing ordinary gum.
D．Participating in social activities
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