单项选择题
A.Both towheads will tend to drift apart，and the overtaking vessel will be slowed down
B.Both towheads will tend to drift together，and the overtaking vessel will be slowed down
C.Both towheads will tend to drift apart，and the overtaken vessel will be slowed down
D.Both towheads will tend to drift together，and the overtaken vessel will be slowed down
单项选择题 When one of two vessels（）is required to keep out of the way the other must keep her course and speed.
单项选择题 When a vessel is in any doubt as to whether such a situation exists she shall（）that it does exist and act accordingly.
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（）.