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【题目】我国西北地区受海陆位置影响,形成了以干旱为主的自然地理环境。据此完成下面小题。

1西北地区自然环境的突出特征是 (  )

A. 河流稀少,多内流河 B. 风力作用强烈,气候干旱

C. 干旱为主 D. 多高大山脉与盆地

2西北地区自然景观以草原和荒漠为主的根本原因是(  )

A. 地形起伏大,高原山地广 B. 远离海洋,深居内陆

C. 水分条件自东向西逐渐变干 D. 植被稀少,植被对气候的调节作用小

【答案】

1C

2B

【解析】试题分析:

1】西北地区干旱为主的自然特征,引起一系列地理要素的变化。降水少,河流补给来源少,靠冰雪融水补给为主,河流稀少发育差,多内流河;该区降水少且不稳定,沙质疏松物质多,加上靠近冬季风源,大风天气集中且多,以风力作用为主;多高山盆地,加剧干旱,故选C

2】西北植被稀少,是因为水分条件差,根本原因是深居内陆,海洋水汽无法到达。故选B

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