I haven't seen my old friends for years, I 'm  looking  forword _____ them.     [ ]

A. to meeting

B. meet

C. to meet

D. meeting

已知钡的活动性处于钾和钠之间，下列说法正确的是 [ ]

A．在溶液中钡离子可氧化Zn

B．钡可以从NaCl溶液中置换出Na

C．钡可以从冷水中置换出H₂

D．钡可以从CuCl₂溶液中置换出Cu