单选
Which of the following is NOT considered a characteristic of farming in the late18th and early 19th centuries?
- A.The “open-field” system.
- B.A system of crop rotation.
- C.Introduction of artificial fertilizer.
- D.Introduction of new agricultural machinery.
试题出自试卷《自考英语国家概况2008年7月真题及答案解析》
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