1 . 听下面一段较长对话，回答以下小题。
1. How long does the man say a 30-year-old should exercise every day?

A．30-60 minutes.

B．60-120 minutes.

C．120-180 minutes.

2. What is children's favorite physical activity?

A．Dancing.

B．Cycling.

C．Running.

3. Who is the man probably?

A．An athlete.

B．A reporter.

C．A scientist.

4. What will the man do next month?

A．Start running.

B．Publish a paper.

C．Take some training.