A.dangerB.dangeredC.dangerousedD.dangerousIt is（）to anc……

单项选择题A long blast to warn the vessels（）vicinity.

A.in
B.on
C.at
D.for

单项选择题CO2 cylinder weighed（）normal weight.

A.light than
B.lighter
C.light
D.lighter than

单项选择题Vessel（）still to bunker 50 tones of fresh water.

A.have
B.have been
C.has been
D.has

单项选择题We（）to let go starboard anchor.

A.is going
B.be going
C.going
D.are going

单项选择题（）spirits and tobacco do you have on board?

A.How much
B.How many
C.How long
D.How far