單項選擇題All the traces are（）old ones.

A.clear
B.evident
C.obvious
D.apparently


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3.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

4.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

5.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