题目

—If a=4, b=5, what’s the answer to the question “ a + 2ab +1 =?”—      .A. Forty-fifth                           B. Forty-five C. Twenty-three                      D. One hundred and twenty-one 答案：B 【解析】本题考查对基数词和序数词的辨析。根据题意，-如果a=4，b=5，那么a+2ab+1=？-等于45。forty-fifth表示第45，forty-five表示45。故本题选B。

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