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【题目】下列关于长江的叙述,正确的是(  )

A. 长江的全流域都可以通航,有“黄金水道”之称

B. 长江水能资源丰富,尤其在下游水量大,水能资源更加丰富

C. 长江上中游分界宜昌、中下游分界湖口

D. 近几年长江洪水灾害加剧的原因是降水量远高于历史上的最大降水量

【答案】C

【解析】

试题长江是我国长度最长 、面积最大 、流域面积最广的河流。有水能宝库黄金水道之称,自四川省的宜宾市起向东都可通航。长江水能资源主要集中的河段是上游河段,多峡谷急流,富水能;中游多曲流,多支流,多湖泊;下游水流平稳,江阔水深。长江上中游的分界线是湖北宜昌;中下游分界线是江西湖口,它是鄱阳湖与长江干流的交汇点。近几年长江洪水灾害加剧的原因是除了降水多以外,更主要的是长江中上游地区植被遭到破坏,含沙量大增;围湖造田,湖泊面积缩小,减弱对河流水量的调蓄能力。

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