单选题A snag or other underwater obstruction may form a（）.AV-shaped ripple with the point of the V pointing upstreamBV-shaped ripple with the point of the V pointing downstreamCsmall patch of smooth water on a windy dayDsmoothing out of the vessel's wake
单选题
A snag or other underwater obstruction may form a（）.
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
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