______ the ______ of buying a house, it costs little to rent a house.

A．Compared to; fee

B．Comparing with; charge

C．Comparing to; fare

D．Compared with; expense

在含有I^一且能使酚酞变红的无色溶液中，可大量存在的离子组是

A．Na⁺、Cu^2＋、Br^一、Cl^－

B．AlO₂^－、K⁺、NH₄⁺、Na⁺

C．K⁺、Na⁺、NO₃^－、H⁺

D．K^＋、S^2－、SO₄^2－、OH^－