单项选择题

Mean low water is the average height of（）.

A.the surface of the sea
B.high waters and low waters
C.all low waters
D.the lower of the two daily low tides

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单项选择题

In the Sargasso Sea there are large quantities of seaweed and no well defined currents. This area is located in the（）.

A.Central North Atlantic Ocean
B.Caribbean Sea
C.Western North Pacific Ocean
D.area off the west coast of South America

单项选择题

In the Northern Hemisphere you are caught in the dangerous semicircle of a storm with plenty of sea room available. The best course of action is to bring the wind on the（）.

A.port quarter and make as much headway as possible
B.starboard quarter and make as much headway as possible
C.starboard bow and make as much headway as possible
D.port bow and make as much headway as possible

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In polar regions you should NOT expect to see（）.

A.mirage effects
B.sea smoke
C.extensive snowfall
D.false horizons