— Have you got any idea for the summer vacation ?  

— I don't mind where we go_________there's sun, sea and beach.   [    ]

A. as if                          

B. as long as  

C. now that                      

D. in order that

用金属锂作电极制造出锂离子电池，它具有               、               ，能够多次                 ，对环境污染                等特点，已被广泛应用于移动通信，小型摄像机上．