题目

下列物质的分类正确的是    (    )   A．混合物：石灰石冰水混合物  B．纯净物：五氧化二磷碘酒   C．有机物：尿素葡萄糖        D．合金：  黄铜  铁 答案：CIf you want to see the chairman, you’d better make an with his secretary first.A. amusement B. achievementC. appointment D. argument