A ChArACtEristiC oF thE "sEConD inDustriAl rEvolution" is______.
A．lEss ElECtroniC Control oF proDuCtivE mAChinEry
B．A DECrEAsE in thE nECEssity For humAn EFFort in proDuCtion
C．A rEDuCtion in lEisurE timE
D．A lowEr stAnDArD oF living