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.
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单项选择题
A．Take a break.B．Go to work.C．Do the other problems.D．Keep trying.
A．Take a break.
B．Go to work.
C．Do the other problems.
D．Keep trying.
单项选择题
A．It’s preserved in liquid.B．The skin is removed.C．It’s dried in the sun.D．It’s freeze-dried.
A．It’s preserved in liquid.
B．The skin is removed.
C．It’s dried in the sun.
D．It’s freeze-dried.
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