A.IsB.HasC.IfD.Do（）there danger of explosion?……

单项选择题（）the whole the stowage is all right.

A.In
B.On
C.From
D.To

单项选择题（）the time of collision，the 3rd officer was on the bridge．

A.At
B.On
C.Of
D.In

单项选择题（）the ship leaves at 1000 today，she can arrive there tomorrow.

A.When
B.How
C.If
D.Should

单项选择题（）the packing is the same，the lots are different in marks.

A.For
B.Since
C.Because
D.Although

单项选择题（）the morning from 0800 to 1200 Chief Officer is on duty.

A.On
B.In
C.At
D.During