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【单选题】
一项时间跨度为半个世纪的专项调查研究得出肯定结论：饮用常规量的咖啡对人的心脏无害。因此，咖啡的饮用者完全可以放心地享用，只要不过量。以下哪项如果正确，则严重地削弱了题干的论证?( )
A.
咖啡的常规饮用量可能因人而异
B.
心脏健康不等同于身体健康
C.
咖啡饮用者可能在喝咖啡时吃对心脏有害的食物
D.
喝茶，特别是喝绿茶比喝咖啡有利于心脏保健
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