（）means a unit in which goods are totally enclosed by sufficient strong boundaries such as a freight container，a tank or a vehicle unit with fabric sides or tops.

The certificate of loading required by each vessel carrying grain in bulk is issued by the（）.

A.owner or charterer of the vessel
B.American Bureau of Shipping
C.shipper of the cargo
D.National Cargo Bureau

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In the case of the leading marks，the master may（）to show these in the bill of lading if the goods or their containers are not clearly marked in such a manner as should ordinarily remain legible until the end of the voyage.

A.confuse
B.excuse
C.defuse
D.refuse

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