听下面一段长对话，回答1-2小题。 1. Who are the speakers? A. Mother and son
| 听下面一段长对话，回答1-2小题。 |
| 1. Who are the speakers? |
| A. Mother and son. B. Teacher and student. C. Doctor and patient. |
| 2. How long should the boy spend taking exercise every week? |
| A. Twenty minutes. B. Forty minutes. C. An hour. |
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