—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

B

【解析】本題考查對(duì)基數(shù)詞和序數(shù)詞的辨析。根據(jù)題意，-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。故本題選B。

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