单选题:图5、6中商品甲、乙是两种互不关联的普通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,若有如下判断:

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图5、6中商品甲、乙是两种互不关联的普通商品

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,若有如下判断:
①两商品的需求量与价格反向变动②两商品的需求量与价格同向变动
③两商品相比,商品甲是生活必需品④两商品相比,商品甲是高档耐用品
其中正确的是 A.①③
B.①④
C.②③
D.②④
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