1. 情景问答，从方框中选择合适的答语，并将序号写在题前括号里

A. It's twenty. B. It's fourteen. C. It's eighteen. D. It's sixteen.

1. （1） —How much is seventeen and three?
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3. （2） —How much is eleven and three? 
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5. （3） —How much is fifteen and one? 
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7. （4） —How much is thirteen and five?
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