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
单项选择题 If you shorten the scope of anchor cable，your anchor’s holding power（）.
单项选择题 If you saw flames aboard a vessel but could see the vessel was not on fire，you would know that the（）.
单项选择题 If there are a number of survivors in the water after abandoning ship，they should（）.
