1、第三节河流地貌的发育长江是我国第一大河,她发源于我国的青藏高原的唐古拉山脉,从西向东依次流经了青藏高原,四川盆地,长江中下游平原。湖北宜昌以上为上游,从宜昌到江西湖口为中游,湖口以下为下游。王教授是一个地理学家,去年暑假,王教授带他的儿子小明利用假期对长江进行全程游览活动。他们从长江上流往下沿江游览,在长江的上游,他们来到了虎跳峡,小明为虎跳峡的汹涌的流水和磅礴的地势所吸引。你认为虎跳峡河谷应该与下列哪幅河流的横断面图相对应?根据此图中流水作用与岩层的关系,你是否认同数万年后虎跳峡可能不在当前位置,为什么?经过了两天的航行,游船进入了长江的中游河段。爸爸对小明说:“我们已经进入了荆江河段,你看
2、看长江与前几天有了什么变化?”小明向前方望去,只见长江此时犹如一条弯曲的巨龙,在大地上延伸;而在河流两岸、部分河道则出现了浅滩,有居民站在浅滩上悠然地钓鱼。讨论回答:图中A、B两点哪个地方更适合建货运码头,并请说明理由。不知不觉间,小明他们在船上已经过了五天,船已经接近终点站上海。小明向河岸望去,只见两岸一片开阔平坦的景象,还可以看到远处几乎消失在地面的轮船,不禁让人想起李白“孤帆远影碧空尽,唯见长江天际流”的诗句。在长江下游地区河床横断面的形在长江下游地区河床横断面的形态应该与下列哪幅图相适应?态应该与下列哪幅图相适应?下列各幅图如何与青藏高原某地河谷、长江下列各幅图如何与青藏高原某地河谷、
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