题目

When I agreed to stage-manage my school’ s production of Guys and Dolls, I had no idea of   61       a stage manager acurally did. Still, I     62     (decide) that it would be a(n)    63   (interest) experience, and a way to get involved with theater. Besides, if there was already a director and some technicians to build the sets and run lights, how much could there be    64    (leave) for a stage manager to do? I figured that I would spend a lot of time    65    rehearsals and scripts（剧本）.     I was discouraged by the first rehearsal. I密度为0.9×103kg/m3的冰块漂浮在水面上，露出水面的体积是0.3m3，那么，冰块的总体积是（　　）A．0.5m3B．0.53m3C．3m3D．30m3