读我国南方某流域等高线图，据图回答问题。在河流综合治理中A地

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读我国南方某流域等高线图，据图回答问题。

在河流综合治理中A地的主要作用为

A．淡水养殖	B．森林绿化，调节气候
C．分洪与蓄洪	D．发展立体农业

为缓解甲河段洪水泛滥，最有效的措施是

A．加强流域内植树造林

B．在甲河上游修建水库

C．下游退耕还湖

D．修建和加固河堤

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