單項選擇題（）the visibility to reduce to one mile by heavy rain，it（）be impossible to rescue the vessel in distress.

A.Was／would
B.Were／would
C.Is／will
D.Is／is to


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1.單項選擇題If more than one raft is manned after the vessel has sunk，you should（）.

A.go in a different direction in search of land
B.spread out to increase the possibility of a search aircraft finding you
C.reduce the number of rafts by getting as many people as possible into as few rafts as possible
D.tie the rafts together and try to stay in a single group

2.單項選擇題Physical exertion on the part of a person who has fallen into cold water would（）.

A.be the best thing to try if there was no rescue in sight
B.increase survival time in the water
C.increase the rate of heat loss from the body
D.not affect the heat loss from the body

3.單項選擇題In each inflatable rescue boat，what piece of equipment is provided to make quick，emergency，temporary repairs to a large hole in a raft?（）.

A.No equipment is provided
B.Glue and rubber patches
C.Several various-sized sealing clamps
D.Self-adhesive rubberized canvas patches

4.單項選擇題Unless it is unavoidable do not jump from a place higher than 5 meters into the water． Try to minimize the shock of sudden cold immersion． When should the said caution be taken into account?（）.

A.The mariners try to put out fire on board of vessel
B.The people on board try to survive themselves from a ship in perils
C.The salvors take actions to rescue the survivors at sea
D.The pilot come on board from his boat in bad weather

5.單項選擇題I have lost a man overboard． Please help（）search and rescue.

A.on
B.in
C.with
D.during