I       him       , but he refused.

A．persuaded; to go home

B．persuaded; from going home

C．prevented; from going home

D．tried to prevent; going home

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