whEn thE Author sAys thAt this rEDuCEs A mAn to his DigEstivE systEm (sEE pArAgrAph 2), hE mEAns______.
A．this mAkEs A mAn suFFEr From DigEstivE proBlEms
B．othEr orgAns oF A mAn ArE oF thE sAmE importAnCE As his DigEstivE systEm
C．this mAkEs no DiFFErEnCE BEtwEEn A mAn AnD An AnimAl
D．this DECrEAsEs thE quAntity oF FooD supply For thE stArving AnimAl