單項選擇題Distress signals may be（）.

A.red flares
B.smoke signals
C.sound signals
D.Any of the above


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2.單項選擇題At night you observe a vessel ahead show three flashes of a white light. This signal indicates that the vessel ahead is（）.

A.in distress
B.approaching a bend in the channel
C.operating astern propulsion
D.intending to overtake another vessel

3.單項選擇題AS SOON AS I HAVE FURTHER INFORMATION I WILL MAKE ANOTHER ANNOUNCEMENT. I ASK YOU KINDLY TO REMAIN CALM. THERE IS NO DANGER AT THIS TIME. These words are likely from（）.

A.the captain of a vessel in distress
B.representative of ship owners
C.an officer from port authorities
D.the pilot of a vessel entering a port in foreign country

4.單項選擇題An orange flag showing a black circle and square is a（）.

A.signal indicating a course change
B.distress signal
C.signal of asking to communicate with another vessel
D.signal indicating danger

5.單項選擇題An airplane wants a vessel to change course and proceed towards a vessel in distress. The actions of the aircraft to convey this message will NOT include（）.

A.circling the vessel at least once
B.heading in the direction of the distress location
C.flashing the navigation lights on and off
D.crossing ahead and rocking the wings