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A. To describe some successful doctors
B. To compare poor writers with diseased people
C. To tell the teachers why some students are poor in health
D. To show the importance of a teacher’s job

A. The need for agricultural advances to help feed a growing population.
B. The development of safer machines demanded by the labor movement.
C. Machinery that contributed to the agricultural revolution.
D. New Jersey as a leader in the agricultural revolution.