单项选择题
--Where is the（）(水手长)? --He’s in his room.
A.captain B.bosun C.pilot D.agent
单项选择题 Check （）(危险区) and report , please.
单项选择题 They should take care of the （系泊缆绳）（）.
单项选择题 Pay attention to the （）（安全）of the gangway.
