单项选择题
The short-long dashed，magenta lines parallel to York River Entrance Channel mark（）．
A.fish trap areas B.naval exercise areas C.underwater cables D.recommended track lines
单项选择题 The short-long dashed magenta line around Gardiners Island marks（）.
单项选择题 The shoreline on charts generally represents the mean（）.
单项选择题 The broken magenta lines（long and short dashes）in and around Mobjack Bay indicate（）.
