—Do you think their table tennis team will win the first place at the coming Asian Games
—（）Ours is much per than theirs.

A. Of course

B. It depends

C. Don't mention it

D. By no means

物质X可发生下列两个反应：① X + 碱 → 盐 + H₂O，② X + 金属氧化物 → 盐 + H₂O，则X可能是（   ）。

A．CaO

B．CO₂

C．NaOH

D．H₂SO₄