单项选择题
If you wear extra clothing when entering the water after abandoning ship it will（）.
A.weigh you down
B.preserve body heat
C.reduce your body heat
D.make it more difficult to breathe
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A.decreases
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If you saw flames aboard a vessel but could see the vessel was not on fire，you would know that the（）.
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单项选择题
If there are a number of survivors in the water after abandoning ship，they should（）.
A.tie themselves to the unit so they won't drift with the current
B.form a small circular group to create a warmer pocket of water in the center of the circle
C.send the strongest swimmer to shore for assistance
D.form a raft by lashing their life preservers together
