听第一段对话，回答第1~5题。

1. What are the speakers mainly talking about?

       A. A well-balanced diet.

       B. The harm of smoking.

       C. A bike riding competition.

2. How long does the man ride every day?

  A. 1 hour.   B. 2 hours.   C. 3 hours.

3. What do they have in common in their daily life?

       A. Smoking every day.     B. Riding practice.           C. Healthy eating.

4. What’s the man’s problem?

   A. He feels nervous sometimes. 

B. He doesn’t have much energy. 

C. He finds it hard to win.