问题 选择题 读一读，选一选，选择正确的得数。( ) 1. 7 + 4 = __________( ) 2. 3 + 9 = __________( ) 3. 19 －5 = __________( ) 4. 20 －15 = __________A. twelve B. eleven A. thirteen B. twelveA. fourteen B. fifteen A. four B. five 答案 1-4 B B A B
