英语六级
A．Too many animals eating the plants in one small area.
B．Planting too much vegetation in one small area.
C．Too many people building houses in one small area.
D．Bringing together the wrong kinds of animals and plants.
细节题。根据Another cause ofdesertification is overgrazing. That's when the grasses and trees and shrubs of an area are expected to feed more animals than they reasonably can.可知，过度放牧也就是在有草树等植物的一片区域饲养过多的动物。因此，正确答案是A。
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A．The animals overfertilize the soil.
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A．It can cause flooding
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