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题干：Ifthose“madmoments”-whenyoucan’trememberwhatyourfriendhastoldyouorwhereyouleftyourkeys-arebecomingmorefrequent,mentalexercisesandahealthybraindietmayhelp.Justasbodiesrequiremoremaintenancewiththepassingyears，sodobrains’whichscientistsnowknowshowsignsofagingasearlyasthe20sand30s.“Brainagingstartsataveryyoungage,youngerthananyofushadimaginedandtheseprocessescontinuegraduallyovertheyears，”saidDr.GarySmall,thedirectoroftheCenteronAgingattheUniversityofCalifornia,LosAngeles.“I’mconvincedthatitisnevertooearlytogetstartedonamentalorbrain-fitnessprogram，”headded.Inhisbook,X.T.the51-year-oldneuroscientist(神经学家)listswhathereferstoasthe10suggestionsforkeepingthebrainyoung.Theyincludetrainingmemory，buildingskills，reducingstress，mentalexercises,brainfoodandahealthylifestyle.It'sagameplanforkeepingbraincellssparkingandneuralnetworksinperfectshape.“Misplacingyourkeysacoupleoftimesdoesn'tmeanyoushouldstartlabelingyourcabinets.Memorylossisnotaninevitableconsequenceofaging.Ourbrainscanfightback，”hesaid.Smallprovidestheweaponsforafull-scaleattack.Simplememorytestsgiveanindicationofwhatyouareupagainstandtoolssuchas“look”and“connect”aredesignedtomakesurethatimportantthingssuchasnamesanddatesareneverforgotten.“Soifyouwantedtolearnnamesandfaces,forexample,youmeetMrs.Beattyandyounoticeadistinguishingfacialfeature，maybeahigheyebrow，”saidSmall.“Youassociatethefirstthingthatcomestomind.IthinkoftheactorWarrenBeattysoIcreateamentalpictureofWarrenBeattykissingherbrow.，，Smalladmitsitmaysoundabitstrangebuthesaysitworks.“Mentalexercisescouldbeanythingfromdoingcrosswordpuzzlesandwritingwithyourlefthandifyouarerighthandedorlearningalanguage.Itcouldbeanythingthatisfunthatpeopleenjoydoing”，headdedHealsorecommendsphysical，exercise，alow-fatdietandeatingfoodsrichinfattyacids，suchasfish,nuts,andfruitsandvegetableshighinantioxidants(抗氧化剂）includingblueberriesandonionsinadditiontoreducingstress.
题目：In this passage, the author mainly tells us_____.
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