1 . 听下面一段独白，回答以下小题。
1. Who are called senior citizens in the USA?

A．People over 55 years old.

B．People over 60 years old.

C．People over 65 years old.

2. What is the feature of senior citizens?

A．They have more free time.

B．They live with their families.

C．They always have part-time jobs.

3. What are senior citizens in big cities usually worried about?

A．Their health.

B．Their wealth.

C．Their safety.

4. What may be the speaker’s attitude towards the future of senior citizens?

A．Doubtful.

B．Optimistic.

C．Cautious.