居民菜篮子价格波动在中秋节、国庆节期间异常明显，节前菜价升高

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居民“菜篮子”价格波动在中秋节、国庆节期间异常明显，节前菜价升高，节后菜价下降已逐渐成为历年来的“自然规律”。这种菜价波动的“规律”
①体现了价值规律的作用
②说明了节日期间菜价不能正确反映价值
③反映了供求关系影响价格
④证明了价值决定价格

A．①②

B．①③

C．③④

D．②④

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