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【题目】读下图“我国局部地区等高线示意图”,完成下列问题。

(1)A省区的主体民族是

(2)B是 (地形区的名称),判断依据是

(3)图中流经C地形区的河流干流典型的水文特征是

(4)C地形区最突出的生态问题是 ,分析其对本区和下游地区造成的危害 是

【答案】(1)蒙古族 (2)华北平原 经纬度位置或海拔高度在200米以下 (3)含沙量大 (4)水土流失严重 本区地表肥沃土壤流失,河流含沙量剧增;淤塞下游河床、水库(或下游形成地上河),易产生洪涝灾害。

【解析】(1)由图可知,A省区是内蒙古自治区,这里的主体民族是蒙古族。

(2)B是华北平原,从经纬度位置或海拔高度在200米以下可判断出。

(3)图中流经C地形区的河流干流典型的水文特征是含沙量大,因为这里流经水土流失严重的黄土高原。

(4)C地形区是黄土高原,最突出的生态问题是水土流失严重,对本区和下游地区造成的危害有本区地表肥沃土壤流失,河流含沙量剧增;淤塞下游河床、水库,易产生洪涝灾害。

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