單項選擇題

Green lights may appear on（）.

A.horizontally banded buoys
B.vertically striped buoys
C.yellow buoys
D.spherical buoys

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單項選擇題

During loading or discharging，the tallymen must make contact with（）on duty so as to solve problems in time.

A.ship owner
B.ship’s officers
C.shippers
D.consignors

單項選擇題

Can you tell me something about the tallying methods at your port?（）.

A.Certain
B.Be certain
C.Sure
D.Be sure