單項選擇題

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.

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單項選擇題

Which of the following statements is NOT true?（）

A.The open field system provided a good opportunity to experiment.
B.The open field system wasted land.
C.The open field system was wasteful of labor and time.
D.The open field system made livestock farming difficult.

單項選擇題

Traditional farming involved the open field village,a system that dated back to the（）century.

A.4th
B.5th
C.6th
D.7th