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A


1 allowing plants to grow naturally without human interference


2 instead of plowing up and down farmers should plow across the slope to form ridges


3 alternately planting different crops in strips


4 involves planting on terraces or steps built on slopes of mountainside


5 planting crops on a different spot each year


6 chinks of stones or rocks are arranged on the edge of the slope


B


a canopy


b contour plowing


c crop rotation


d natural vegetation


e riprapping


f strip cropping


g terracing


h windbreaks