Which of the following is Not considered a characteristic of farming in the late 18th and early 19th centuries?
A.use of artificial fertilizer B.introduction of new agriculture machinery C.The "open-field" system D.a system of croprotation正确答案C
Which of the following is Not considered a characteristic of farming in the late 18th and early 19th centuries?
A.use of artificial fertilizer B.introduction of new agriculture machinery C.The "open-field" system D.a system of croprotation正确答案C
