单项选择题
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
单项选择题 Physical exertion on the part of a person who has fallen into cold water would（）.
单项选择题 In each inflatable rescue boat，what piece of equipment is provided to make quick，emergency，temporary repairs to a large hole in a raft?（）.
单项选择题 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?（）.