thE Author mADE CompArison BEtwEEn rEADing milton AnD CookBook in orDEr to______.
A．mErEly CompArE thE DiFFErEnCE
B．show thE FACt thAt CookBook is morE usEFul
C．rEvEAl thE vulgArity oF somE rEADErs
D．to point out thAt thE powEr oF litErAturE is ABovE thE litErAturE oF knowlEDgE in CErtAin wAys