單項(xiàng)選擇題In 1979 an extensive（）program was in progress throughout Suez Canal.
A.a dredge and widen
B.dredged and widened
C.dredging and widening
D.being dredging and widening
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1.單項(xiàng)選擇題In a crossing situation on international waters, a short blast by the give-way vessel indicates that the vessel（）.
A.is holding course and speed
B.is turning to starboard
C.intends to pass port to port
D.will keep out of the way of the stand-on vessel
2.單項(xiàng)選擇題In a crossing situation on open waters, a sailing vessel shall keep out of the way of all the following vessels except a vessel（）.
A.not under command
B.restricted in her ability to maneuver
C.engaged in towing
D.fishing
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