将下列歇后语补充完整，并写出两句你平时积累的歇后语。   

1．水滴石穿 —— (                                           )   

2．砌墙的石头——(                                          )   

3．关羽失荆州——(                                          )   

4．周瑜打黄盖——(                                          )   

1．                                                                                                                                          

2．                                                                                                                                          

离子交换柱( )
A．38 B．39 C．40 D．41