单项选择题
A.with puncture wounds B.when all other means have failed C.when the victim is unconscious D.to prevent bleeding from minor wounds
A.at a high rate of speed B.under oars C.against the wind D.with the wind
A.V-shaped ripple with the point of the V pointing upstream B.V-shaped ripple with the point of the V pointing downstream C.small patch of smooth water on a windy day D.smoothing out of the vessel's wake