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【单选题】
蜂蜜总含糖量达65％-75％，还含有丰富的酶类，水溶性维生素及钙、铁、锌等。新鲜的蜂蜜可直接食用，也可配成水溶液，但不可用开水或高温蒸煮。下列说法正确的是A.
钙、铁、锌是人体必需的微量元素
B.
高温会使酶活性增强
C.
蜂蜜属于混合物，主要成分是糖类
D.
开水使蜂蜜结晶析出
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