（年高考课标卷Ⅱ）在我国，煤炭是电力生产的主要原料。煤炭价格

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（年高考课标卷Ⅱ）在我国，煤炭是电力生产的主要原料。煤炭价格从2011年约850元/吨大幅度下降到2014年底约500元/吨，有人据此建议下降电力价格。能支持其建议的恰当理由是

A．电力产能过剩，出现供过于求的情况

B．电力是生活必需品，低价有利于社会稳定

C．电力价格与其生产成本的变化方向应当一致

D．电力与煤炭是互补品，而这价格变化方向应当一致

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