单项选择题

A．They are rarely used today.
B．They have a lot of uses.
C．People often carry rulers with them.
D．Every schoolchild has a ruler.
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单项选择题
A．In pleasant situations.B．In quiet situations.C．In violent circumstances.D．In gloomy circumstances.
A．In pleasant situations.
B．In quiet situations.
C．In violent circumstances.
D．In gloomy circumstances.
单项选择题
A．Twenty years ago.B．Three hundred years ago.C．Two centuries ago.D．At the beginning of the 20th century.
A．Twenty years ago.
B．Three hundred years ago.
C．Two centuries ago.
D．At the beginning of the 20th century.
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