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单选题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.

题目
单选题
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.

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