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【题目】根据所学知识,回答下列问题。

(1)西北地区的地形以____________为主,河流很少,且多为____________,是一个以____________为主要自然特征的地区。

(2)西北地区干旱的原因:________________________________________________。

(3)西北地区____________自东向西逐渐减少,植被自东向西依次过渡为草原-荒漠草原-荒漠。

【答案】(1)高原、盆地;内流河;干旱;(2)深居内陆、远离海洋,山脉对湿润气流的阻挡;(3)降水

【解析】(1)西北地区的地形以高原、盆地为主,河流很少,且多为内流河,是一个以干旱为主要特征的地区。

(2)西北地区由于深居内陆、远离海洋,山脉对湿润气流的阻挡,气候十分干旱。

(3)西北地区降水自东向西逐渐减少,植被自东向西依次过渡为草原-荒漠草原-荒漠。

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