题目内容：

阅读下列内容，从每小题所给的四个选项中选出一个最佳答案

Smog is a big problem in many Chinese cities. But it seems that besides wearing a mask, few of us know what has caused the smog and what to do to beat it. Chai Jing, a former news interviewer with CCTV, discussed the questions in her documentary Under the Dome.

The 103-minute film was on websites on Feb 28. In the film, Chai visits polluted places and talks to officials and scientists. She thinks that burning too much coal and oil are the main causes of PM2.5 and smog.

To solve the problem, Chai suggests that we should clean our coal and oil or replace them with cleaner energy such as natural gas. In her film, Chai also emphasized (强调) that everyone can do something to help control smog too. For example, we can live a greener life by using more public transport. Or if we see things that could harm the environment, we can try to stop it. In the film, when she sees a restaurant cooking without any suitable filter facilities (过滤设备), she calls the hotline 12369. The restaurant installed the filter a week later.

Chen Jining, the new minister of environmental protection, praised Chai. “This film encourages ordinary people to take notice of the environment. This is what we need in the future.”

1.What is the main cause of smog according to Chai?

A. Setting off too many fireworks.

B. Burning too much coal and oil.

C. Too many cars in big cities.

D. Too many factories and companies.

2.Which of the following is NOT included in Chai’s suggestions towards reducing smog?

A. Using cleaner energy.

B. Cleaning coal and oil.

C. Using public transport.

D. Replacing coal with wind energy.

3.What can we tell from the story?

A. Only factories produce heavy smog.

B. Only the government can control smog.

C. Smog can’t be controlled by ordinary people.

D. Living a green life can help reduce smog.

4.What’s Chen Jining’s attitude towards Chai’s film?

A. He didn’t watch it.     B. He thought highly of it.

C. He disagreed with it.    D. He disliked  it.