石墨作电极电解下列溶液，阴阳两极产生的气体体积比为2:1，且电解液pH增大的是[ ]

A．KCl

B．NaOH

C．Na₂SO₄

D．H₂SO₄

The two dogs started to fight, so we tried to _____ them.

A．split

B．separate

C．tear

D．divide