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- 问题详情：Thedesertsoftheworldarenotallcoveredwithsand.Manyofthemhavesurfacesofrockorclayorsmallstones.Theyarenotflat,either.Theyoftenhavehighhillsanddeepvalleys.Thereissomeplants’lifeinmanypartsofthedesert.Thereislittleraininthedesert,butitdoesfallof...
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