【題目】讀下圖“我國局部地區(qū)等高線示意圖”,完成下列問題。
(1)A省區(qū)的主體民族是 。
(2)B是 (地形區(qū)的名稱),判斷依據(jù)是 。
(3)圖中流經(jīng)C地形區(qū)的河流干流典型的水文特征是 。
(4)C地形區(qū)最突出的生態(tài)問題是 ,分析其對本區(qū)和下游地區(qū)造成的危害 是 。
【答案】(1)蒙古族 (2)華北平原 經(jīng)緯度位置或海拔高度在200米以下 (3)含沙量大 (4)水土流失嚴(yán)重 本區(qū)地表肥沃土壤流失,河流含沙量劇增;淤塞下游河床、水庫(或下游形成地上河),易產(chǎn)生洪澇災(zāi)害。
【解析】(1)由圖可知,A省區(qū)是內(nèi)蒙古自治區(qū),這里的主體民族是蒙古族。
(2)B是華北平原,從經(jīng)緯度位置或海拔高度在200米以下可判斷出。
(3)圖中流經(jīng)C地形區(qū)的河流干流典型的水文特征是含沙量大,因?yàn)檫@里流經(jīng)水土流失嚴(yán)重的黃土高原。
(4)C地形區(qū)是黃土高原,最突出的生態(tài)問題是水土流失嚴(yán)重,對本區(qū)和下游地區(qū)造成的危害有本區(qū)地表肥沃土壤流失,河流含沙量劇增;淤塞下游河床、水庫,易產(chǎn)生洪澇災(zāi)害。
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