单项选择题

A．1998-2000.
B．1989-1992.
C．1998-2001.
D．1999-2002.
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单项选择题
Which of the following is the main topic of the passage
A．Agriculture advances were needed to help feed a growing population.
B．Safer machines were demanded by the labor movement.
C．Machines contributed to the agricultural revolution.
D．Indiana took the lead in the agricultural revolution.
单项选择题
A．Great, congratulations!B．It is very difficult.C．She is very clever.D．The university is very famous.
A．Great, congratulations!
B．It is very difficult.
C．She is very clever.
D．The university is very famous.
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