单项选择题
A.East to northeast
B.East to southeast
C.North to northwest
D.South to southeast
单项选择题 In 1979 an extensive（）program was in progress throughout Suez Canal.
单项选择题 In a crossing situation on international waters, a short blast by the give-way vessel indicates that the vessel（）.
单项选择题 In a crossing situation on open waters, a sailing vessel shall keep out of the way of all the following vessels except a vessel（）.