（） transport of goods is the principal means of transport in many countries due to the low threshold infrastructure requirements.

Customs clearance in the import-export trade is one of the traditional functions of a freight forwarder.Customs clearance measures mainly include （）。

A.declaration
B.document-checking
C.duty- paying
D.cargo-examination

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On traffic lanes where demand is strong and plane capacity is limited， the air rates will be （）and vice versa for traffic lanes where supply exceeds demand.

A.low
B.high
C.normal
D.average

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