单项选择题
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.
单项选择题 Which of the following statements is NOT true?（）
单项选择题 Traditional farming involved the open field village,a system that dated back to the（）century.
单项选择题 The Peasant Uprising of 1381 did not direct against（）
