单项选择题

Green lights may appear on（）.

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

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

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