Which of the following statements is NOT considered a characteristic of farming in the late 18th and early 19th centuries?（）AUse of artificial fertilizer.BIntroduction of new agricultural machinery.CThe'Open-field'system.DA system of crop rotation.
Which of the following statements is NOT considered a characteristic of farming in the late 18th and early 19th centuries?（）
AUse of artificial fertilizer.
BIntroduction of new agricultural machinery.
CThe'Open-field'system.
DA system of crop rotation.
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