单项选择题
A.bell B.clock C.hammer D.spanner
Modern ships are navigated by（）（卫星）.A.moonB.satelliteC....
单项选择题Modern ships are navigated by（）（卫星）.
A.moon B.satellite C.sextant D.radar
Their task is to（）（驾驶） the ship safely.A.navigateB.oper...
单项选择题Their task is to（）（驾驶） the ship safely.
A.navigate B.operate C.takeover D.drive
Keep the vessel to the （）(中间)of the channel.A.portB.mid...
单项选择题Keep the vessel to the （）(中间)of the channel.
A.port B.middle C.head D.front
