题目内容：
Questionsarebasedonthefollowingpassage:
IftheEuropeansthoughtadrought--alongperiodofdryweather--wassomethingthathappenedonlyinAfrica,theyknowbetternow.Afterfouryearsofbelow-normalrainfall(insomecasesonly10percentofannualaverage),vastareasofFrance,Spain,Portugal,Belgium,BritainandIrelandaredryandbarren(贫瘠).WaterissolowinthecanalsofnorthernFrancethatwaterwaytrafficisforbiddenexceptonweekends.Oyster(牡蛎)growsinBrittanyreporta30percentdropinproductionbecauseofthelossoffreshwaterinlocalriversnecessaryforoysterbreeding.InsoutheasternEngland,therollinggreenhillsofKenthaveturnedsobrownthatofficialshavebeenweighingplanstopipeinwaterfromWales.InPortugal,farmersinthesouthernAlentejoregionhaveheldprayermeetingforrain--sofar,invain.
Governmentsindrought-spreadcountriesaretakingseveremeasures.Authoritiesinhard-hitareasofFrancehavebannedwashingcarsandwateringlawns.InBritain,waterwillsoonbemetered,likegasandelectricity,"TheEnglishhavealwaystakenwaterforgranted,"saysGrahamWarren,aspokesmanofBritain'sNationalRiversAuthority."Nowthey'reputtingapriceonit."
Evenasuddenendtothedroughtwouldnotendthemiseryinsomeareas.Itwilltakeseveralyearsofunusuallyheavywinterrain,theexpertssay,justtobringexistingwaterreservesuptotheirnormallevels.
Whatdoestheauthormeanbysaying"theyknowbetternow"? A．Theyknowmoreaboutthecausesofthedrought
B．TheyhaveabetterunderstandingofthedroughtinAfrica
C．TheyhaverealizedthatthedroughtinEuropeisthemostseriousone
D．TheyhaverealizedthatdroughtshitnotonlyAfricabutalsoEurope
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答案解析：