解；12×2=35×53=0.5×2．
故答案为：2，53，2．
若集合A={y|y=x2-1}，B={x|x2-1|≤3}，则A∩B是（ ）
A．∅
B．[-1，2]
C．[1，2]
D．[-2．-1]
（）the factory doesn't smell terrible.
A.Amazing
B.Amazed
C.Amazingly
D.Amazedly
