单项选择题
Spring tides are tides that（）.
A.have lows lower than normal and highs higher than normal
B.have lows higher than normal and highs lower than normal
C.are unpredictable
D.occur in the spring of the year
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A.its velocity in knots
B.direction from which it flows
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Scouring is the result of（）.
A.interruption of the normal current flow by the footing
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A.pick up speed where the channel widens
B.run slower in the center of the channel
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