2 . 听下面一段较长对话，回答以下小题。
1. What is the relationship between the speakers?

A．A couple.

B．Colleagues.

C．Classmates.

2. What waste will Alex take care of?

A．Cans.

B．Paper.

C．Plastic bottles.

3. What do the speakers decide to do?

A．Stop using paper cups.

B．Prepare boxes for different wastes.

C．Reduce the use of paper, plastic and cans.

3 . 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.

4 . 听下面一段较长对话，回答以下小题。
1. How did the woman get to know about third-hand smoke?

A．From young smokers.

B．From a newspaper article.

C．From some smoking parents.

2. Why does the man say that he would keep away from babies?

A．He has just become a father.

B．He wears dirty clothes.

C．He is a smoker.

3. What does the woman suggest smoking parents should do?

A．Stop smoking altogether.

B．Smoke only outside their rooms.

C．Reduce dangerous matters in cigarettes.