单项选择题

A．$1.53.
B．$15.3.
C．$5.3.
D．$3.5.
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单项选择题
A．Big waves pose a threat to commercial navigation.B．The river current never flows faster ten miles per hour.C．The river reverses its flow several times a day.D．High tides can create sudden and unexpected rapids.
A．Big waves pose a threat to commercial navigation.
B．The river current never flows faster ten miles per hour.
C．The river reverses its flow several times a day.
D．High tides can create sudden and unexpected rapids.
单项选择题
A．Individual states.B．Federal government.C．Taxes of citizens.D．Parents.
A．Individual states.
B．Federal government.
C．Taxes of citizens.
D．Parents.
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