听下面一段独白，回答以下小题。
1. Who is the speaker talking to?
2. Where was the research carried out?
3. How many people watched TV for more than four hours in the study?
4. What advice does the speaker give in the end?
1. Who is the speaker talking to?
| A．Office clerks. | B．Medical researchers. | C．Students. |
| A．In Africa. | B．In the U.S. | C．In the U.K. |
| A．About 1,200. | B．About 2,400. | C．About 3,600. |
| A．Getting regular medical check-ups. |
| B．Taking part in the research. |
| C．Taking exercise. |
更新时间：2024-05-24 17:41:47
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