—      _   today!

— Yes. Shall we have a picnic in the open air?             [ ]

A. What fine weather is              

B. How fine weather it is

C. What a fine weather it is          

D. How fine the weather is

一列长200米的火车，以12m/s的速度通过400米的大桥，要完全通过大桥需要多长时间？