單項選擇題

Keep to the middle of the（）(航道) ！

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

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單項選擇題

An officer is always（）（值班）on the bridge .

A. on watch
B. taking watches
C. standing watches
D. keep watches

單項選擇題

What（）(航速)?

A.speed
B.line
C.wake
D.route