将下列句子重新排序，使之成为一个对话。

( ) R-U-L-E-R.

( ) What's it in English?

( ) Hello, Mary. Is this your “尺子”?

(     ) How do you spell ruler?

( ) Yes, it is.

( ) It's a ruler.

( ) Thank you.

( ) Here you are (给你).

_____________________________

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