问题 选择题 计算下列算式,选择正确的答案。( ) 1. 50 - 35( ) 2. 20 + 30( ) 3. 27 + 18( ) 4. 49 - 12( ) 5. 40 - 14A. forty-five B. thirty-sevenC. fifteen D. fiftyE. twenty-six 答案 1. C 2. D 3. A 4. B 5. E