A.moonB.satelliteC.sextantD.radarModern ships are navig……

单项选择题Their task is to（）（驾驶） the ship safely.

A.navigate
B.operate
C.takeover
D.drive

单项选择题Keep the vessel to the （）(中间)of the channel.

A.port
B.middle
C.head
D.front

单项选择题The after part of a ship is called（）(船尾) .

A.head
B.tail
C.stern
D.quarter

单项选择题Steer（）（北）！

A.south
B.north
C.east
D.west

单项选择题Keep the NO1（）(浮标) on the port side!

A.buoy
B.mark
C.beacon
D.channel