单项选择题
According（）the report，the ship hit the wharf when berthing.
A.of B.to C.for D.on
单项选择题 A vessel showing a yellow light over a white light at night is a vessel（）.
单项选择题 A message warning of a tropical storm should be sent as a(n)（）.
单项选择题 A crew member has just fallen overboard off your port side. Which action should you take?（）.
