题目

—Jimmy has had a lot of parties recently.  —Yes, that might         why he didn’t do well in the test. A. sum up          B. push for         C. account for         D. make sense   答案：C底面积相等的圆柱和圆锥，它们的体积比是1：2，圆锥的高是9厘米，圆柱的高是（　　）厘米． A、3B、1.5C、18D、24