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【答案】1. ---How much is twenty-one and thirty? ---It’s fifty-one. 2. ---How much is seventeen and twenty? ---It’s thirty-seven. 3. ---How much is forty and thirteen? ---It’s fifty-three. 4. ---How much is twenty-nine and thirteen? ---It’s forty-two. 5. ---How much is thirty-two and eleven? ---It’s forty-three.
【解析】
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