题目内容：
根据以下材料，回答题Advertiserstendtothinkbigandperhapsthisiswhythey'realwayscominginforcriticism.Theircriticsseemtoresentthembecausetheyhaveaflairforself-promotionandbecausetheyhavesomuchmoneytothrowaround."It'siniquitous,"theysay,"thatthisentirelyunproductiveindustry(ifwecancallitthat)shouldabsorbmillionsofpoundseach
year.Itonlygoestoshowhowmuchprofitthebigcompaniesaremaking.Whydon'ttheystopadvertisingandreducethepriceoftheirgoods?Afterall,it'stheconsumerwhopays..."
Thepooroldconsumer!He'dhavetopayagreatdealmoreifadvertisingdidn'tcreatemassmarketsforproducts.Itispreciselybecauseoftheheavyadvertisingthatconsumergoodsaresocheap.
Butwegetthewrongideaifwethinktheonlypurposeofadvertisingistosellgoods.An-otherequallyimportantfunctionistoinform.Agreatdealoftheknowledgewehaveabouthouse-holdgoodsderiveslargelyfromtheadvertisementsweread.
Advertisementsintroduceustonewproductsorremindusoftheexistenceofoneswealreadyknowabout.Supposingyouwantedtobuyawashingmachine,itismorethanlikelyyouwouldob-taindetailsregardingperformance,price,etc.,fromanadvertisement.
Lotsofpeoplepretendthattheyneverreadadvertisements,butthisclaimmaybeseriouslydoubted,Itishardlypossiblenottoreadadvertisementsthesedays.Andwhatfuntheyoftenare,
too!Justthinkwhatarailwaystationoranewspaperwouldbelikewithoutadvertisements.Wouldyouenjoygazingatablankwallorreadingrailwaybye-lawswhilewaitingforatrain?Wouldyouliketoreadonlycloselyprintedcolumnsofnewsinyourdailypaper?Acheerful,wittyadvertisementmakessuchadifferencetoadrabwalloranewspaperfullofthedailyrationofcalamities.Wemustnotforget,either,thatadvertisingmakesapositivecontribution
toourpockets.Newspapers,commercialradioandtelevisioncompaniescouldnotsubsistwithoutthissourceofrevenue.Thefactthatwepaysolittleforourdailypaper,orcanenjoysomany
broad-castprogrammesisdueentirelytothemoneyspentbyadvertisers.Justthinkwhatanewspaperwouldcostifwehadtopayitsfullprice!
Anotherthingwemustn'tforgetisthe"smallads."whichareinvirtuallyeverynewspaperandmagazine.Whatatremendouslyusefulservicetheyperformforthecommunity!Justabout
any-thingcanbeaccomplishedthroughthesecolumns.Forinstance,youcanfindajob,buyorsellahouse,announceabirth,marriageordeathinwhatusedtobecalledthe"hatch,matchand
dis-patch"columnbutbyfarthemostfascinatingsectionisthepersonalor"agony"column.Nootheriteminanewspaperprovidessuchentertainingreadingorofferssuchadeepinsightinto
humannature.It'sthebestadvertisementforadvertisingthereis!
Whatisthemainideaofthispassage? A．Advertisement.
B．Thebenefitsofadvertisement.
C．Advertisersperformausefulservicetocommunities.
D．Thecostsofadvertisement.
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