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.
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单项选择题
A．Serious.B．Uncommon.C．Usual.D．Light.
A．Serious.
B．Uncommon.
C．Usual.
D．Light.
单项选择题
A．Simple tools are necessary for mankind.B．Simple tools can be very complicated.C．Simple tools are forgotten in the modem society.D．Modern technology are needed in the modem society.
A．Simple tools are necessary for mankind.
B．Simple tools can be very complicated.
C．Simple tools are forgotten in the modem society.
D．Modern technology are needed in the modem society.
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