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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