商品甲、乙是两种互不关联的商品。当两商品的价格P均从P1同幅

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商品甲、乙是两种互不关联的商品。当两商品的价格P均从P1同幅下降到P2时，对于需求量Q的变化，结合下图有如下判断，其中正确的是

①两商品的需求量均与其价格同方向变动 ②两商品的需求量与其价格反方向变动
③两商品相比，商品甲是高档耐用品 ④两商品相比，商品甲是生活必需品

A．①③

B．①④

C．②③

D．②④

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