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    2008年北京奥运会主体育场的外形好似“鸟巢”(The Bird Nest)，有一类物质也好似鸟巢，如化学式是B5H9的五硼烷(见图)．下列有关五硼烷的说法错误的是

    [　　]

    A．五硼烷属于化合物

    B．五硼烷的相对分子质量是64

    C．五硼烷中硼元素和氢元素的质量比为5∶9

    D．1个五硼烷分子由5个硼原子和9个氢原子构成

    答案：C
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