多项选择题

（）are the barriers to international trade.

A.capital
B.import duties
C.non-tarriffbarrier
D.import quotas

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单项选择题

The services that a freight forwarder renders may often range from routine and basic tasks such as（）or customs clearance to a comprehensive package of services.

A.the providing of services
B.the utilizing of services
C.the booking of space
D.the loading and unloading

单项选择题

When one of the original bills of lading being surrendered to the carrier， the others become （）.

A.invalid
B.valid
C.clean
D.dirty

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