单项选择题
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
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A.No equipment is provided
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A.on
B.in
C.with
D.during
