相关Thedesertsoftheworld的文学知识

问题详情：Thedesertsoftheworldarenotallcoveredwithsand.Manyofthemhavesurfacesofrockorclayorsmallstones.Theyarenotflat,either.Theyoftenhavehighhillsanddeepvalleys.Thereissomeplants’lifeinmanypartsofthed...