单项选择题
The short-long dashed magenta line around Gardiners Island marks（）.
A.A regulated anchorage
B.Fish trap areas
C.An area closed to the public
D.Underwater cables
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The shoreline on charts generally represents the mean（）.
A.High water line
B.Low water line
C.Low water spring line
D.Tide level -
单项选择题
The broken magenta lines（long and short dashes）in and around Mobjack Bay indicate（）.
A.Amphibious training areas
B.Grounds for dredge spoil
C.Fish trap areas
D.Gunnery exercise areas -
单项选择题
The arrangement of charts in the catalogue is（）.
A.on a regional basis
B.on a national basis
C.shown orderly
D.appeared from A to W
