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單項(xiàng)選擇題

When abandoning ship and jumping into the water from a substantial height without a life jacket,you should().

A.dive head first,using your hands to break the surface of the water
B.hold your arms firmly at your sides and jump feet first
C.jump feet first,covering your nose and mouth with one hand and grasping the opposing upper arm with the other
D.jump feet first,holding your knees to your chest

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