A. Because it is recommended by doctors. B. Because there are a lot of walking programs for you to choose. C. Because you only need to walk 30 minutes daily. D. Because it does not need particular place or tim 参考答案:D
第28题: [单项选择]Questions 23 to 25 are based on the conversation you have just heard.[A] At a library. [C] At a laboratory. [B] At a copy shop. [D] At a coffee shop. 参考答案:D 答案解析:[听力原文] Where does the man work