— See the gathering clouds outside? Please take this umbrella with you.

— ________.[ ]

A. Thanks. Take it easy  

B. OK, just in case

C. Well, it just depends  

D. All right, I'll try my luck

托运人根据买卖合同和信用证的有关规定向承运人或其代理人办理货物运输的书面凭证称为( )。

A．装货单

B．装箱单

C．订舱单

D．收货单