What do the surfaces of the deserts look like? Many of them have surfaces of ______.

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问题 What do the surfaces of the deserts look like?
   Many of them have surfaces of ______.
The deserts of the world are not all covered with sand. Many of them have surfaces of (11) rock or small stones. They are not all flat, either. They often have (12) high hills and deep, valleys, There is a little rain in the desert, but it does not co

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答案rock, small stones

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