题目

 Is that the lab _____we did physics experiments in during our middle school daysA. what    B. where    C. which    D.  the one 答案：C把一个圆柱形罐头瓶的侧面包装纸展开，得到一个正方形，这个圆柱形罐头瓶的底面半径是6厘米，那么它的高是________厘米．