题目

—How did you find your visit to the exhibition, John?     —______     A. By taking a No. 3 bus.       B. Oh, wonderful, indeed.     C. I went there alone.          D. A classmate of mine showed me the way.   答案：B有一个可以改变体积的密闭容器内装有一定质量的二氧化碳，当改变容器的体积时，气体的密度也会随之改变，密度ρ（单位：kg/m3）是体积V（单位：m3）的反比例函数，它的图象如图所示，当V=2m3时，气体的密度是    kg/m3．