单项选择题

A．The agricultural revolution.
B．The invention of labor-saving machinery.
C．The development of scientific agriculture.
D．The farming machinery in Americ
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单项选择题
A．Life without television.B．Life in the city.C．Life in the countryside.D．Life full of lov
A．Life without television.
B．Life in the city.
C．Life in the countryside.
D．Life full of lov
填空题
in改为on。
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