单项选择题

Our offer remains open （） 3 days.

A．at
B．for
C．in
D．on

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单项选择题
The （） contract is a contract between a party who agrees to accept the risk and a party seeking protection from the risk.

A．payment
B．production
C．shipment
D．insurance
单项选择题
The goods which are carried into and out of the territory by the same vessel or aircraft are defined as （）.

A．transit goods
B．transshipment goods
C．through goods
D．import and export goods
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