英语六级

单选题

A．The animals overfertilize the soil.
B．Dead plant roots can't hold the soil together.
C．The wrong types of plants are left standing.
D．There is a buildup of plant and animal matter.

参考答案：B进入在线模考
How does overgrazing damage soil?
细节题。根据Too many animals eating in the same area will kill the vegetation. And because it's the roots of this vegetation that hold much of the soil together, when too much of the vegetation dies, the soil erodes.可知．过度放牧会严重破坏植被，而这些植被的根能够凝沙固土，一旦植被被破坏，土地就会退化。因此，正确答案是B。

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