[多项选择]由于全球变暖导致的水源减少，沙漠化仍难以遏制。中国西部的沙漠以平均每年310平方公里的速度扩大，也就是说，中国每年丧失一个中等县面积的土地。当牲畜把见到的一切植被吃完时，表层土壤就会被刮走，只剩下沙子。沙尘暴的频发向我们发出警告：破坏大自然就等于自取灭亡。

参考答案:Because of the decline of water resources caused by global warming, it is still difficult to curb (check)desertification. The desert in the west of China is enlarging(spreading)at the(an annual) rate (speed) of CA0 square kilometers a year. That is to say, China loses land the size of a medium- sized county. When cattle eat all the vegetations in sight (they can see), the top soil will be blown away, leaving nothing but sand behind / nothing but sand remains. Frequent sandstorms send us a warning that to destroy nature is to head for (seek / invite) self-destruction.