thE writEr BEliEvEs thAt rEADing By thE ComputEr is ADvisABlE ChiEFly BECAusE ______.
A．it sAvEs A lot oF timE to FinD inFormAtion nEEDED
B．it rEADs morE EFFiCiEntly thAn A humAn minD
C．it CovErs A muCh wiDEr rAngE oF rEFErEnCE
D．it guArAntEEs rEADing EFFiCiEnCy AnD vAliDity