题目

下列物质中属于化合物的是                                       (     ) A.蒸馏水         B.清新的空气       C.纯牛奶          D.加碘食盐 答案：A—Hello, may I speak to Sandy? —          .     A. Yes, I'm Rose                         B. I'll call back again     C. Yes, I can't hear you                  D. This is Sandy speaking