题目

下列关于物质性质的比较，不正确的是（    ）               A、酸性强弱：HIO4>HBrO4>HClO4        B、氧化性：F2>Br2>I2    C、碱性强弱：KOH>NaOH>LiOH        D、金属性强弱：Na>Mg>Al 答案：A ----- Why are they taking all the equipment away ? ------____________ , they are packing up to leave. A. The job was done                 B. The job has been done C. With the job done                 D. With the job doing