题目

Mother was greatly _____ at the news that her son was found by the police．        A．relieved                B．relaxed              C．satisfying            D．enthusiastic 答案：A一个圆柱的侧面展开得到一个边长6.28厘米的正方形，那么这个圆柱的高是（ ）厘米，底面直径是（ ）厘米。