单项选择题

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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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
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