ACCorDing to thE pAssAgE, thE kEy to suCCEssFul wEight rEDuCtion is to ______.
A．ExpEnD thE sAmE Amount oF CAloriE As in tAking
B．Do mAny typEs oF physiCAl ACtivitiEs
C．ExErCisE rEgulArly
D．pAy AttEntion to DiEt