单项选择题
Vessels should maintain a sharp lookout，especially during December through March，when navigating the right whale’s only known calving grounds which lie off the coasts of（）.
A.Nova Scotia B.Maine and Massachusetts C.Georgia and NE Florida D.California and Mexico
单项选择题 Vessel engaged in the launching or recovery of aircraft is called（）．
单项选择题 Underway at night，a vessel displaying the lights shown is（）.
单项选择题 Under what condition are you allowed to depart from the rules of the road（）.
