A. one of the boundaries of a region where new agricultural settlement took place
B. a major source of water for agricultural crops
C. the primary route by which agricultural crops were transported
D. a main source of power for most agricultural machinery
A
Chọn A
Thông tin ở câu cuối bài : “The growing market for cotton and other American agricultural products led to an unprecedented expansion of agricultural settlement, mostly in the eastern half of the United States---west of the Appalachian Mountains and east of the Mississippi River.”
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