計算,選擇得數(shù)。
(     ) 1. What's seventeen plus fourteen?
(     ) 2. What's nine plus twelve?
(     ) 3. What's thirteen plus thirty-six?
(     ) 4. What's forty-one plus fourteen?
(     ) 5. What's twenty-five plus fifteen?
A. Forty-nine.
B. Fifty-five.
C. Thirty-one.
D. Forty.
E. Twenty-one.
1. C  2. E  3. A  4. B  5. D
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