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單項(xiàng)選擇題

（）should ensure that adequate measures are taken to prevent alcohol and drugs from impairing the ability of watchkeeping personnel.

A.The quarantine officers
B.Administrations
C.The immigration officers
D.The customs officers

單項(xiàng)選擇題

You are about to cross a narrow channel when you see an approaching vessel that can only be navigated safely within the channel.You should（）.

A.cross the channel as you are the stand-on vessel
B.cross only if the vessel in the channel is approaching on your port side
C.not cross the channel if you might impede the other vessel
D.sound the danger signal