Researchershaveestablishedthat-查字典问答网

来自李成锴的问题

　　Researchershaveestablishedthatwhenpeoplearementallyengagedbiochemicalchangesoccurinthebrainthatallowittoactmoreeffectivelyincognitive(认知的)areassuchasattentionandmemory.Thisistrueregardlessofage.

　　Peoplewillbealert（警觉的）andreceptiveiftheyarefacedwithinformationthatgetsthemtothinkaboutthingstheyareinterestedin.Andsomeonewithahistoryofdoingmoreratherthanlesswillgointooldagemorecognitivelysoundthansomeonewhohasnothadanactivemind.

　　Manyexpertsaresoconvincedofthebenefitsofchallenginginthebrainthattheyareputtingthetheorytoworkintheirownlives.“Theideaisnotnecessarilytolearntomemorizelargeamountsofinformation”saysJamesFozardassociatedirectoroftheNationalInstituteofAgeing.“Mostofusdon’tneedthatkindofskill.Suchspecifictrainingisoflessinterestthanbeingabletomaintainmentalalertness.”Fozardandotherssaytheychallengetheirbrainswithdifferentmentalskillsbothbecausetheyenjoythemandbecausetheyaresurethattheirrangeofactivitieswillhelpthewaytheirbrainswork.

　　GeneCohenactingdirectorofthesameinstitutesuggeststhatpeopleintheiroldageshouldengageinmentalandphysicalactivitiesindividuallyaswellasingroups.Cohensaysthatwearefrequentlyadvisedtokeepphysicallyactiveasweagebutolderpeopleneedtokeepmentallyactiveaswell.Thosewhodoaremorelikelytomaintaintheirintellectualabilitiesandtobegenerallyhappierandbetteradjusted.“Thepointisyouneedtodoboth”Cohensays.Intellectualactivityactuallyinfluencesbrain-cellhealthandsize.

　　50.Whatisthepassagemainlyabout?

　　A.Specialmentaltrainingforoldpeople.

　　B.Biochemicalchangesinthehumanbrain.

　　C.Theinfluenceofintellectualactivitiesonbrain-cellsize.

　　D.Theimportanceofmentalactivitiesintheefficiencyofthebrain.

　　51.Apersonwhoissaidtobecognitivelyhealthyshould________.

　　A.bealertandreceptiveinmind B.whoarehighlyintelligent

　　C.begoodatdoinggroupwork D.rememberlargequantitiesofinformation

　　52.ThefindingsofJamesandotherscientistsintheirwork_________.