Farming on steep slopes(陡坡) as well as in dry, windy climates ______ particular soil conservation methods.
Under()the French Canadian farming economy of the St.Lawrence valley and its language,religion,and customs continued unchanged.
Forest fires, farming and mining destroy the rainforests.
____
Traditional farming involved the open field village,a system that dated back to the()century.
Forest fires, farming and mining destroy the rainforests.
____
Which of the following statements is NOT considered a characteristic of farming in the late 18th and early 19th centuries?()
留茬耕作 subble mulch farming