whEn rEsEArChErs ConDuCtED A thrEE-yEAr stuDy involving nEArly 3,000 pEoplE olDEr thAn 65, whAt shoulD thEsE pEoplE Do First
A．thEy shoulD Fill up A DiEtAry Form rEgulArly.
B．thEy shoulD EnABlE thE rEsEArChErs to EvAluAtE.
C．thEy shoulD CompArE DiFFErEnt EFFECts oF vitAmin E．
D．thEy shoulD tAkE A rEgulAr DiEt As ADvisE