单项选择题

A．Basketball players.
B．Professional football players.
C．A few Stars.
D．Tennis players.
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单项选择题
A．The invention of machine.B．The invention of the alphabet.C．The invention of rockets.D．The invention of agriculture.
A．The invention of machine.
B．The invention of the alphabet.
C．The invention of rockets.
D．The invention of agriculture.
单项选择题
A．The invention of machine that can save labor and the progress of scientific agriculture.B．The invention of crude equipments and agricultural implements.C．The advance of agriculture machinery and the iron plow.D．The idea of a cast-iron plow and steel plow.
A．The invention of machine that can save labor and the progress of scientific agriculture.
B．The invention of crude equipments and agricultural implements.
C．The advance of agriculture machinery and the iron plow.
D．The idea of a cast-iron plow and steel plow.
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