题目内容：
Questionsarebasedonthefollowingpassage． Energyindependence．Ithasaniceringtoit,doesn'tit?Ifyouthinkso,you'renotalone,becauseenergyindependencehasbeenthedreamofAmericanpresidentsfordecades,andnevermoresothaninthepastfewyears,whenthemostrecentoilpriceshockhasbeenpartlyresponsibleforkickingoffthegreatrecession．
“Energyindependence”anditsrhetorical(修辞的)companion“energysecurity',are,however,slipperyconceptsthatarerarelythoughtthrough．Whatisitwewantindependencefrom,exactly?
Mostpeoplewouldprobablysaythattheywanttobeindependentfromimportedoil．Buttherearereasonsthatwebuyallthatofffromelsewhere．
Thefirstreasonisthatweneedittokeepoureconomyrunning．Yes,thereisatrickle(涓涓细流)ofbiofuel(生物燃料)available,andmoremaybecomeavailable,butmostbiofueiscauseeconomicwasteandenvironmentaldestruction．
Second,Americanshavebasicallydecidedthattheydon'treallywanttoproducealltheirOwnoil．Theyvaluetheenvironmentalqualitytheypreserve,overtheiroffimportsfromabroad．VastareasoftheUnitedStatesareoff-limitstooffexplorationandproductioninthenameofenvironmentalprotection．TowhatextentareAmericansreallywillingtoenduretheenvironmentalimpactsofdomesticenergyproductioninordertocutbackimports?
Third,therearebenefitstotrade．Itallowsforeconomicefficiency,andwhenwebuythingsfromplacesthathavelowerproductioncoststhanwedo,webenefit．Andalthoughyoudon'treadaboutthismuch,theUnitedStatesisalsoalargeexporterofoffproducts,sellingabout2millionbarrelsofpetroleumproductsperdaytoabout90countries．
ThereisnoquestionthattheUnitedStatesimportsagreatdealofenergyand,infact,reliesonthatsteadyflowtomaintainitseconomy．Whenthatflowisinterrupted,wefeelthepaininshortsuppliesandhigherprices．Atthesametime,wederivemassiveeconomicbenefitswhenwebuythemostaffordableenergyontheworldmarketandwhenweengageinenergytradearoundtheworld．
WhatdoestheauthorsayaboutenergyindependenceforAmerica? A．Itsoundsveryattractive．
B．Itensuresnationalsecurity．
C．Itwillbringoilpricesdown．
D．Ithaslongbeeneveryone'sdream．
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