题目内容：

听下面一段较长对话，回答以下小题。

1.What are the speakers talking about?

A. A way to improve air quality.    B. A problem with traffic rules.    C. A suggestion for city planning.

2.What does the man suggest?

A. Limiting the use of cars.

B. Encouraging people to walk.

C. Warning drivers of air pollution.

3.What does the woman think about the man’s idea?

A. It’s interesting.    B. It’s worth trying.    C. It’s impractical.