The basic functions of a bill of lading is (are)（）.

A．a receipt for the goods which evidences the taking-over or loading by the carrier

B．an evidence of contract of carriage between the carrier and the shipper.

C．a document of title to goods.

D．All of the above.

制定混合航线的目的是既避开高纬度地区恶劣气候，又使船保持在最短航程航线上航行。