读某水库运行后入库泥沙量、出库泥沙量及拦截率变化统计图，完成

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读某水库运行后入库泥沙量、出库泥沙量及拦截率变化统计图，完成下列各题。

按照目前的发展趋势，该水库面临的主要问题是（）

A．上游来水减少	B．水库库容逐渐变小
C．库区水污染加剧	D．入库泥沙量不断增多

1997年出库泥沙量剧增的主要原因是（）

A．上游水土流失加剧	B．水库库容变小
C．水库清淤	D．水库拦截率高

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相关知识点

主要的环境污染问题三类岩石的相互转化和地壳物质循环

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