题目

— We were talking about the new play ____， remember?     — Yes， I enjoyed it very much. A. the other day            B. another day     C. some day              D. other day 答案：A 解析: the other day表示过去时间的某一天，常与过去时态连用。如果半径为3cm的⊙O1与半径为4cm的⊙O2内切，那么两圆的圆心距O1O2=    cm．