题目

People have planted a great many trees in order to ____wind and sand in the desert. A. hold down          B. hold up           C. hold back        D. hold out 答案：C 解析: hold down压制，限制；hold up推迟，耽搁；hold back阻挡，抑制；hold out提供，提出。句意：人们种了大量的树，为了阴挡风和沙尘。由此可知答案为C项。

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