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單項(xiàng)選擇題

Mean high water is the average height of（）.

A.The higher high waters
B.The lower high waters
C.The lower of the two daily tides
D.All high waters

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單項(xiàng)選擇題

Mariners not entering the port are（）to keep at least one mile off.

A.Advised
B.Reported
C.Complied
D.Supplied

單項(xiàng)選擇題

Many of the lights on this coast are placed so high as to be frequently obscured by（）.

A.Power
B.Tower
C.Cover
D.Shower

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