皮皮学，免费搜题
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【单选题】
市场上有甲、药品，如果甲药品价格下降引起乙药品需求的增加，那么
A.
甲和乙药品是互替产品
B.
甲和乙药品是互补产品
C.
甲为低档药品，高档药品
D.
甲为高档药品，低档药品
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