单项选择题
When you read the sailing directions, you should notice that this is one of a series of publications produced by the（）which should be consulted by users of Admiralty Charts.
A.UK Hydrographic Office
B.IMO
C.International Hydrographic Organization
D.International Association of Classification society
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When are you allowed to throw plastic garbage overboard?（）
A.Being mroe than 25 miles from shore
B.Only at night when it‟s dark
C.Being more than 6 miles from shore
D.Never -
单项选择题
Which kind of fog is also named as ground fog?（）
A.Advection
B.Radiation fog
C.frontal fog
D.Steam fog -
单项选择题
Normally the mariners care more about the（）of tide.
A.speed
B.height
C.direction
D.course
