题目内容：

Without any advertisement，a documentary(纪录片)named Under the Dome became popular on the Internet recently.

The 103­minute film was on Chinese video­sharing websites on Feb 28.Chai Jing who used to work for CCTV made it.

In the film，Chai discusses the topic of smog—where it comes from and how to beat it.

She visited many polluted places and talked to officers and scientists. She said that burning too much coal and oil are the main cause of PM2.5 and smog in China. To make things worse，according to Chai，the coal and oil we are burning is of poor quality(质量)and don't meet the standards for environmental protection. They have produced more harmful gas(气体)．

Chai also suggested that besides the government，every one of us could actually do something to help beat the air pollution.

For example，instead of taking cars，we could choose subway or bus. Also，if you find things that could harm the environment，call 12369—a hotline for environmental problems. Chai had tried it herself. When she saw a restaurant cooking and producing harmful gas，she called 12369.The problem was solved a week later.

What's more，if you find any pollutant source(污染源)，take a picture of it and post it on weibo.Remember to add “@local environmental departments”．

Chen Jining，the leader of environmental protection，praised Chai.“This film encourages common people to pay more attention to the environment. This is what we need in the future.”

1.According to Chai，the main cause of smog is ________．

A. too many cars in big cities    B. burning too much coal and oil

C. cutting down too many trees    D. too many factories and companies

2.We could do something EXCEPT ________ to help beat the air pollution.

A. choosing subway or bus instead of taking cars

B. burning the coal and oil of good quality more often

C. calling 12369 if we find things harming the environment

D. taking a picture of any pollutant source and post it on weibo

3.What Chen Jining said showed us that ________．

A. he supported Chai's action    B. he disagreed with Chai

C. he didn't watch Under the Dome    D. he didn't like Under the Dome

4.According to the passage，we know ________．

A. Under the Dome is an advertisement about the environmental protection

B. Chai made Under the Dome to get more people to pay attention to environment

C. Chai called 12369 when she saw a restaurant cooking terrible food with bad oil

D. the coal and oil we are burning meet the standards for environmental protection