C 分析:要使商是兩位數(shù),那么被除數(shù)的最高位上的數(shù)要小于除數(shù),由此求解. 解答:被除數(shù)是452,要使商是兩位數(shù),那么被除數(shù)的最高位的數(shù)4小于除數(shù),所以除數(shù)最小是5. 故選:C. 點評:三位數(shù)除以一位數(shù),被除數(shù)百位上的數(shù)字和一位數(shù)比較大小,百位上的數(shù)字比一位數(shù)大或相等商就是三位數(shù),比一位數(shù)小,商就是兩位數(shù).