第21题: [单项选择]Customer: How much are the eggs Saleswoman: ______ A. They are free-range. B. We have some free-range eggs. C. The free-range eggs cost more than regular ones. D. The free-range ones are $ 3.95 a dozen. 参考答案:D 答案解析:[解析] 判定对话发生在市场。A项和B项都与问题不相关;C项回答不全面。