【题目】读下图,回答问题。
(1)写出图中字母和数字代表的地理事物的名称。
山脉:A__________B________C_________
地形区: ①_____________②___________③_________
(2)由右上图可知我国地形特点是 , 。
(3)在左图画出三级阶梯的分界线。
(4)简要分析我国地势特征对河流产生的影响。
【答案】(1)山脉:A喜马拉雅山脉B天山C大兴安岭
地形区: ①长江中下游平原②内蒙古高原③塔里木盆地。
(2)地形类型多样,山区面积广大。
(3)略
(4)对河流流向影响:我国西高东低的地势,使我国许多大河自西向东流入海洋。
对水能资源影响:地势呈阶梯状分布,阶梯交界处,河流落差大,水能资源丰富。
【解析】(1)由图可知,图中A是位于我国西藏自治区西南部的喜马拉雅山,B是位于新疆中部的天山,C是东北-西南走向的大兴安岭。
(2)由右上图可以看出,我国地势特点是西高东低、呈三级阶梯状分布。
(3)我国第一、第二阶梯分界线是昆仑山-祁连山-横断山脉;第二、第三阶梯的分界线是大兴安岭-太行山-巫山-雪峰山。
(4)我国地势对河流流向影响:我国西高东低的地势,使我国许多大河自西向东流入海洋;对水能资源影响:地势呈阶梯状分布,阶梯交界处,河流落差大,水能资源丰富。
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