问题 选择题 给下列算式选择它的得数。( ) 1. three + four + ten = ? ( ) 2. nine + eleven = ? ( ) 3. one + seven = ? ( ) 4. six － two + eight = ? ( ) 5. five + four + six = ?A. twenty B. seventeenC. fifteen D. eight E. twelve 答案 1-5 B A E D C
