ACCorDing to thE Author, ______ .
A、olDEr ADults nEED morE physiCAl ExErCisEs thAn thE youngEr onEs
B．youngEr ADults ArE not nECEssAry to tAkE A physiCAl ExAminAtion BEForE A FitnEss progrAm
C．FitnEss progrAms For olDEr ADults shoulD BE wEll - monitorED
D．poorly-DEsignED FitnEss progrAms For olDEr ADults will Do sErious hArms to thEm