Which of the following statements is NOT considered a characteristic of farming in the late 18th and early 19th centuries?（）<br>A:Use of artificial fertilizer.<br>B:Introduction of new agricultural machinery.<br>C:The'Open-field'system.<br>D:A system of crop rotation.

Which of the following statements is NOT considered a characteristic of farming in the late 18th and early 19th centuries?（）
A:Use of artificial fertilizer.
B:Introduction of new agricultural machinery.
C:The'Open-field'system.
D:A system of crop rotation.

出自：00522《英语国家概况》

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