Smog（雾霾） isabigprobleminmanyChinesecities．Butitseemsthatbesideswearingamask，fewofusknowwhathascausedthesmogandwhattodotobeatit．ChaiJing，aformernewshostesswithChinaCentralTelevision，discussedthequestionsinherdocumentaryUndertheDome（穹顶之下）．

The103-minutefilmwaspublishedonmajorChinesevideo-sharingwebsitesonFeb28．Inthefihn，Chaivisitspollutedplacesandtalkstoofficialsandscientists．ShecomestotheconclusionthatburningtoomuchcoalandoilarethemaincausesofPM2.5andsmog．

Tomakethingsworse，accordingtoChai，thecoalandoilweareburningisofpoorqualityanddon'tmeetthestandardsforenvironmentalprotection．Thereforetheyhaveproducedmoreharmfulgasandparticles（颗粒） topollutetheair．

Tosolvetheproblem，Chaisuggeststhatweshouldcleanourcoalandoilorreplace（替代） themwithcleanerenergysuchasnaturalgas．Inherfihn，Chaialsopointedoutthatordinarypeoplecandosomethingtohelpcontrolsmogtoo．Forexample，weliveagreenerlifebyusingmorepublictraffic．Orifweseethingsthatcouldharmtheenvironment，wecantrytostopit．Inonescenefromthefihn，Chaiseesadirtmound（土堆） inabuildingsiteexposed（暴露） intheair，andasksthepersoninchargetocoverit．Whensheseesarestaurantcookingwithoutanysuitablefilterfacilities （过滤设备），shecallsthehotline12369．Therestaurantinstalledthefilteraweeklater．

ChenJining，thenewministerofenvironmentalprotection，praisedChai．"Thisfihnencouragesordinarypeopletocareabouttheenvironment．Thisiswhatweneedinthefuture．"

38．Whatdomostofpeopledotodealwiththesmog？___

A．Wearamask．

B．Thinkofwaystobeatit．

C．Findoutwhathascausedit．

D．Takeadocumentary．

39．WhatisthemaincauseofsmogaccordingtoChai？___

A．Settingofftoomanyfireworks．

B．Burningtoomuchcoalandoil．

C．Toomanycarsinbigcities．

D．Toomanyfactoriesandcompanies．

40．WhichofthefollowingisNOTChai'ssuggestionstowardsreducingsmog？___

A．Usingcleanerenergy．

B．Cleaningcoalandoil．

C．Usingnaturalgas．

D．Replacingcoalwithwind