单项选择题
A.float B.floating C.floats D.floated
She arrived at the anchorage last night and anchored（）b...
单项选择题She arrived at the anchorage last night and anchored（）berth.
A.waiting B.awaiting C.awaiting for D.waited
Shall we（）wait at the roadstead till there is a free be...
单项选择题Shall we（）wait at the roadstead till there is a free berth for us?
A.must B.ought to C.have to D.never
Routine radio communications should be no more than（）.A...
单项选择题Routine radio communications should be no more than（）.
A.one minute B.three minutes C.five minutes D.eight minutes
