在一个棱长是3米的正方体容器里，浸没一个高为2米的圆锥铁块，当把此圆锥铁块从容器中取出时，容器里的水面下降了1米，则圆锥铁块的体积为（　　）立方米．　

根据图画提示完成对话

    Mike is a very cool boy. He very likes Chinese food. He likes ____, but he can't use ____. Mike's friend Wu  Yifan  lies ____. He can use ____ and ____now. Their teachers Miss White is beautiful . She likes ____and ____. She can use ____.

设a、b、c表示三种不同物体的质量，用天枰称两次，情况如图所示，则这三种物体的质量从小到大排序正确的是（   ）