单项选择题
A.of B.on C.for D.at
It is（）to anchor in your present position.A.dangerB.dan...
单项选择题It is（）to anchor in your present position.
A.danger B.dangered C.dangeroused D.dangerous
A long blast to warn the vessels（）vicinity.A.inB.onC.at...
单项选择题A long blast to warn the vessels（）vicinity.
A.in B.on C.at D.for
CO2 cylinder weighed（）normal weight.A.light thanB.light...
单项选择题CO2 cylinder weighed（）normal weight.
A.light than B.lighter C.light D.lighter than
