單項選擇題

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

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單項選擇題

Which kind of fog is also named as ground fog?（）

A.Advection
B.Radiation fog
C.frontal fog
D.Steam fog

單項選擇題

Normally the mariners care more about the（）of tide.

A.speed
B.height
C.direction
D.course

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