∵集合A={x|y= x?1 + 2?x }={x| x?1≥0 2?x≥0 }={x|1≤x≤2},∴?RA={x|x<1,或x>2},又 B={y|y=log2x,x∈A}={y|0≤y≤1},∴(?RA)∩B=[0,1),故选:B.