—How about going hiking this weekend?

—Sorry. I would rather _______ than _______.[ ]

A. to stay at home; to go out

B. stay at home; to go out

C. stay at home; go out

D. staying at home; going out

不另选试剂，仅利用组内物质之间的相互反应，就能将它们鉴别出来的是（　　）

A．HCl  CuCl₂  NaNO₃  Na₂SO₄

B．BaCl₂    Na₂CO₃  HCl  K₂CO₃

C．FeCl₃  HCl  NaCl    NaOH

D．Na₂CO₃  Na₂SO₄  HCl  H₂SO₄