题目

-- What caused the failure of the experiment?     -- _____.     A. Because of shortage of fund  B. For lack of fund     C. Lack of fund   D. Due to lack of fund 答案：C下列哪项物质的组成中，含有糖类物质 A．性激素　　       B．酒精　　        C．核糖核酸　     　 D．胆固醇