题目内容：
Questionsarebasedonthefollowingpassage:
Howcanwegetridofgarbage?Dowehaveenoughenergysourcestomeetourfutureenergyneeds?
Thesearetwoimportantquestionsthatmanypeopleareaskingtoday．Somepeoplethinkthatmanmightbeabletosolvebothproblemsatthesametime．Theysuggestusinggarbageasanenergysource,andatthesometimeitcansavethelandtoholdgarbage．
Foralongtime,peopleburiedgarbageordumped(倾倒)itonemptyland．Now,emptylandisscarce．Butmoreandmoregarbageisproducedeachyear．However,garbagecanbeagoodfueltouse．Thethingsingarbagedonotlooklikecoal,petroleum,ornaturalgas;buttheyarechemicallysimilartothesefossil(化石)fuels．Asweuseupourfossilfuelsupplies,wemightbeabletousegarbageasanenergy
source．
Burninggarbageisnotanewidea．SomecitiesinEuropeandtheUnitedStates,havebeenburninggarbageforyears．Theheatthatisproducedbyburninggarbageisusedtoboilwater．Thesteamthatisproducedisusedtomakeelectricityortoheatnearbybuildings．InParisFrance,somepowerplantsburnalmost2millionmetrictonsofthecitiesgarbageeachyear．Theamountofenergyproducedisaboutthesameaswouldbeproducedbyburningalmostahalfmillionbarrelsofoil．
Ourfossilfuelsuppliesarelimited．Burninggarbagemightbeonekindofenergysourcethatwecanusetohelpmeetourenergyneeds．Thismethodcouldalsoreducetheamountofgarbagepilingupontheearth．
Whattwoproblemscanmansolvebyburninggarbage? A．Theshortageofenergyandairpollution
B．Theshortageofenergyandthelandtoholdgarbage
C．Airpollutionandtheshortageoffossilfuel
D．Airpollutionandtheshortageoflandtoholdgarbage
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答案解析：