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单选题
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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单选题Neap tides occur（）.A
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单选题A tide is called diurnal when（）.A
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考题
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