单项选择题

A．It’’s cheaper.
B．It’’s safer.
C．It’’s quicker.
D．It’’s convenient.
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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
Using technology is an easy way to shop.
A．Y
B．N
C．NG
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