问题 选择题 帮下列数字选择它们的英文朋友。( ) 1. 50( ) 2. 21( ) 3. 31( ) 4. 30( ) 5. 15( ) 6. 40A. fifteenB. fortyC. thirty-oneD. thirtyE. fiftyF. twenty-one 答案 1. E 2. F 3. C 4. D 5. A 6. B