17．Smog（霧霾） 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 hostess with China Central Television，discussed the questions in her documentary Under the Dome（穹頂之下）．
The 103-minute film was published on major Chinese video-sharing websites on Feb 28．In the fihn，Chai visits polluted places and talks to officials and scientists．She comes to the conclusion that burning too much coal and oil are the main causes of PM2.5and smog．
To make things worse，according to Chai，the coal and oil we are burning is of poor quality and don't meet the standards for environmental protection．Therefore they have produced more harmful gas and particles（顆粒） to pollute the air．
To solve the problem，Chai suggests that we should clean our coal and oil or replace（替代） them with cleaner energy such as natural gas．In her fihn，Chai also pointed out that ordinary people can do something to help control smog too．For example，we live a greener life by using more public traffic．Or if we see things that could harm the environment，we can try to stop it．In one scene from the fihn，Chai sees a dirt mound（土堆） in a building site exposed（暴露） in the air，and asks the person in charge to cover it．When she sees a restaurant cooking without any suitable filter facilities （過濾設(shè)備），she calls the hotline 12369．The restaurant installed the filter a week later．
Chen Jining，the new minister of environmental protection，praised Chai．"This fihn encourages ordinary people to care about the environment．This is what we need in the future．"
38．What do most of people do to deal with the smog？A
A．Wear a mask．
B．Think of ways to beat it．
C．Find out what has caused it．
D．Take a documentary．
39．What is the main cause of smog according to Chai？B
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．
40．Which of the following is NOT Chai's suggestions towards reducing smog？D
A．Using cleaner energy．
B．Cleaning coal and oil．
C．Using natural gas．
D．Replacing coal with wind energy．
41．What's the meaning of the underlined word"installed"？C
A．沖洗
B．出售
C．安裝
D．修理
42．What's Chen Jining's attitude towards Chai's film？B
A．He didn't watch it．
B．He thought highly of it．
C．He didn't agree with it．
D．He criticized it．
