1 . 听下面一段较长对话，回答以下小题。
1. Why does the woman plan to wear a mask tomorrow?

A．Because of the smog.

B．Because of her illness.

C．Because of the cold weather.

2. What’s a big problem in the city?

A．The heavy traffic.

B．The air pollution.

C．The large population.

3. What do the speakers decide to do?

A．Change their ways to go to work.

B．Ask the government to do something.

C．Call on people to protect the environment.

4. What can we know about the man?

A．He always uses the public transport.

B．He seldom listens to the weather report.

C．He is waiting for the weather to improve soon.