读“中国西北地区局部图”,完成15-16题。 15.图中有明确区域边界

读“中国西北地区局部图”,完成15-16题。

15.图中有明确区域边界的是(   )                       

A.库布齐沙漠

B. 呼和浩特市                                 

C. 土默川平原

D.阴山山脉                    

16.河套平原农业可持续发展面临的主要问题是(   )

A.湿地破坏           B.森林锐减      C.水土流失           D.土壤盐渍化

答案

BD

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