单项选择题

A．Every ten minutes.
B．At twenty to one.
C．Every half-hour.
D．Once a day.
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单项选择题
A．It went out of use 300 years ago.B．It was invented after the short bow.C．It was discovered before fire and the wheel.D．It’s still in use today.
A．It went out of use 300 years ago.
B．It was invented after the short bow.
C．It was discovered before fire and the wheel.
D．It’s still in use today.
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