问题 选择题 算一算并选择正确的答案。( ) 1. 3 × 7 = ( ) 2. 72 － 38 = ( ) 3. 84 ÷ 2 = ( ) 4. 23 + 28 = ( ) 5. 42 － 29 = A. thirty-fourB. fifty-oneC. thirteen D. twenty-oneE. forty-two 答案 1. D 2. A 3. E 4. B 5. C
