题目内容：
根据短文，回答题Thelongyearsoffoodshortageinthiscountryhavesuddenlygivenwaytoapparentabundance．StoresandshoDsarechokedwithfood．Rationingisvirtuallysuspended，andoverseassuppliershavebeenaskedtoholdbackdeliveries．Yet，insteadofjoy，thereiswidespreaduneasinessandconfusion．Whydofoodpriceskeeponrising，whenthereseemstobe80muchmorefoodabout?Istheabundanceonlytemporary，orhasitcometostay?Doesitmeanthatweneedtothinklessnowaboutproducingmorefoodathome?Nooneknowswhattoexpect．Therecentgrowthofexportsurplusesontheworldfoodmarkethascertainlybeenunexpectedlygreat，partlybecauseastrangesequenceoftwosuccessfulgrainharvestsinNorthAmericaisnowbeingfollowedbyathirdIMrostofBritain’soverseassuppliersofmeat，too，areofferingmorethisyearandhomeproductionhasalsoraised．
ButtheeffectofallthisonthefoodsituationinthiscountryhasbeenmadeworsebysimultaneousriseinfoodDrices，duechieflytothegradualcuttingdownofgovernmentsupportforfood．Theshopsareover-stockedwithfoodnotonlybecausethereismorefoodavailablebutalsobecausepeople，frightenedbyhighprices，arebuying1essofit．Moreover，theriseindomesticpriceshascomeatatimewhenworldpriceshavebeguntofallwiththeresuitthatimportedfood，withtheexceptionofgrain，isoftencheaperthanthehome-Droducedvariety．Andnowgrainprices,to0，arefalling．Consumersarebeginningtoaskwhytheyshouldnotbeenabledtobenefitfromthistrend．Thesignificanceofthesedevelopmentsisnotlostonfarmers．
Theoldergenerationshaveseenitallhappenbefore．Despitethepresentpriceandmarketguarantees,farmersfeartheyareabouttobesqueezedbetweencheapfoodimportsandashrinkinghomemarket．Presentproductionisrunningat51percentabovepre-warlevels，andthegovernmenthascalledforanexpansionto60percentby1956；butrepeatedministerialadviceiscarryinglittleweightandtheexpansionprogramisnotworkingverywell．
Themainpurposeofthefirstparagraphis__________． A．toshowthereasonoffoodshortage
B．toexplaintheconflictbetweenthesurplusoffoodsupplyandrisingprices
C．toshowthedeterioratinglivingconditionsoffarmers
D．toanalyzethemarketdemandforfoodsupply
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