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．Yes.B．No.C．Maybe.D．Unknown.
A．Yes.
B．No.
C．Maybe.
D．Unknown.
单项选择题
A．The concert was bad.B．The concert was excellent.C．He didn’t go to the concert.D．He’ d like to enjoy it again.
A．The concert was bad.
B．The concert was excellent.
C．He didn’t go to the concert.
D．He’ d like to enjoy it again.
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