问题 选择题 选择正确的计算结果。( ) 1. 22 + 4 - 5 = ? ( ) 2. 18 + 17 + 15 = ? ( ) 3. 10 + 31 - 9 = ? ( ) 4. 49 - 8 + 5 = ? ( ) 5. 23 + 8 + 9 = ?A. Forty B. Fifty C. Forty-six D. Twenty-one E. Thirty-two 答案 答案:C