如下曲线所示，甲商品的数量（Q）随着价格（P）的变动而变动，

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如下曲线所示，甲商品的数量（Q）随着价格（P）的变动而变动，这可能说明的关系是（）

①甲商品的供给量（Q）与自身价格（P）
②甲商品的需求量（Q）与自身价格（P）
③甲商品的需求量（Q）与其互补品的价格（P）
④甲商品的需求量（Q）与其替代品的价格（P）

A．①③

B．②③

C．①④

D．②④

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