阅读理解ItwasthemiddleofAprilof1975．Alargenumberofbirdswereflyingnorthward．Thousandsofducksledthewayastheyusuallydo．Butthingsweredifferentthatyear．Thenorthwi

　　阅读理解

　　ItwasthemiddleofAprilof1975．Alargenumberofbirdswereflyingnorthward．Thousandsofducksledthewayastheyusuallydo．

　　Butthingsweredifferentthatyear．Thenorthwindswereverystrong．Heavysnowstormscamequitelateinthespring．Thebirdsbadlyneededaplacetogetoutofthestormsandtorestduringtheirlongflights．ThousandsofducksfoundaplacetorestinNebraska．

　　AtthattimeaterriblediseasethatkillsbirdsbrokeoutinNebraska．Ducksweredyingingreatnumbers．Hawksthatlivednearbywerespreading(传播)thediseasetothewaterbirdsthatlandedonthesmalllakes．

　　Thewildlifeworkers(野生动物保护工作者)werenotabletostoptheterribledisease．Astheyworriedoverthedyingbirdstheysuddenlythoughtofsomethingevenworse．Inafewdaysthewhoopers(美洲鹤)oneofthemostbeautifulbirdsweregoingtoflyacrossthestate．

　　Whatwouldhappenifevenoneoftheforty-nineremainingwhooperswastolandnearthesickbirds?Ifawhoopersgotthediseaseitcouldspreadtoalltherest．

　　AbadsnowstormblewoverNebraskaasthefirstwhoopersfoughttheirwayacrossthestate．Theywereforceddownbythestorm．Andtheylandedrightinthemiddleofoneoftheplaceswherethediseasewasspreading．Afarmerwasthefirsttoseetheninewhoopersonthelake．Thewildlifeworkersquicklypreparedtosavethewhoopers．Theyworkedforlonghourstryingtofrightenthebirdsawaytoasafeplace．Theyfiredgunsbutthewhoopersrefusedtomove．

　　Atlastitstoppedsnowing!Withasmallplanetheworkerswereabletodriveallbuttwoofthewhooperstoasafeplace．

　　Allnightlongtheworkersstayedinthecoldastheywatchedoverthewhoopers．Suddenlyasdaybegantobreakthelasttwowhooperstookoff．Theyweredrivenbytheairplanetoasafeplace．

　　Slowlythewindsbecamelessstrong．Theninewhoopersflewofftothenorth．Thewildlifeworkersweretiredbuthappy．

　　1．Whatwast