题目

---- I' m surprised to hear that Sue and Paul have __   . ----So am I. They seemed very happy together when I last saw them. A. broken up          B. finished up       C. divided up         D.closed up   答案：A现有一根11节的竹子，自上而下各节的容积成等差数列，上面4节的容积共3升，下面4节的容积共5升，则这根竹子的容积共（　　）升．A.8B.9C.10D.11