题目内容：
根据以下材料，回答题Evenasmallreductioninsaltinthedietcanbeabighelptotheheart.AnewstudyusedacomputermodeltopredicthowjustthreegramslessadaywouldaffectheartdiseaseintheUnitedStates.
Theresult:thirteenpercentfewerheartattacks.Eightpercentfewerstrokes.Fourpercentfewerdeaths.Elevenpercentfewernewcasesofheartdisease.Andtwohundredfortybilliondollarsin
healthcaresavings.
Researchersfounditcouldpreventonehundredthousandheartattacksandninety-twothousanddeathseveryyear.
ThestudyisintheNewEnglandJournalofMedicine.KirstenattheUniversityofCalifornia,wastheleadauthor.Shesayspeoplewouldnotevennoticeadifferenceintastewiththreegrams,orone-halfteaspoon,lesssaltperday.TheteamalsoincludedresearchersatStanfordandColumbiaUniversity.
Eachgramofsaltcontainsfourhundredmilligramsofsodium,whichishowfoodsmaylisttheirsaltcontent.
ThegovernmentsaystheaverageAmericanmaneatstengramsofsaltaday.TheAmericanHeartAssociationadvisesnomorethanthreegramsforhealthypeople.ItsayssaltintheAmericandiet
hasincreasedfiftypercentsincethenineteen-seventies,whilebloodpressureshavealsorisen.Lesssaltcanmeanalowerbloodpressure.
NewYorkCityMayorMichaelBloombergisleadinganeffortcalledtheNationalSaltReductionInitiative.Theideaistoputpressureonfoodcompaniesandrestaurants.
MayorBloomberghasalreadysucceededinotherareas,likerequiringfastfoodplacesinthecitytolistcalorieinformation.NowastudybytheSeattleChildren'sResearchInstituteshowshow
thatideacaninfluencewhatparentsorderfortheirchildren.
Ninety-nineparentsofthreetosixyearoldstookpart.HalfhadMcDonald'smenusclearlyshowinghowmanycalorieswereineachfood.Theotherhalfgotmenuswithoutthecalorieinformation.
Allthefollowingarerelatedtothesaltindietexcept A．Strokes
B．heartattacks
C．bloodpressures
D．stomachdiseases
参考答案：
答案解析：