2022-2023学年上海市华东师范大学第二附属中学高二下学期期末考试英语试题.pdfVIP

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2022-2023学年上海市华东师范大学第二附属中学高二下学期期末考试英语试题

1.Directions:Afterreadingthepassagebelow,fillintheblankstomakethepassage,coherentand

grammaticallycorrect.Fortheblankswithagivenword,fillineachblankwiththeproperformof

thegivenword;fortheotherblanks,useonewordthatbestfitseachblank.

Scientistsweredeeplyconcernedaboutwhatwashappening.Avianvacuolarmyelinopathy(AVM)

wasfirstdiscoveredinthewinterof1994129baldeaglecarcasseswerefoundnearDeGrayLake,

aman-madereservoirinArkansas.Twoyearslater,atleast70eagleshaddiedacrossseveral

Arkansasreservoirs.By1998,conditionscontinuedtodeteriorateasdeadbirdsofdifferentspecies

includingAmericancoots,mallardsandring-neckedduckswereconfirmedattensitesacrosssix

states.Allofthedocumentedcasesofthis2(emerge)diseaseoccurredonornearmanmadewater

reservoirswithabundantaquaticvegetation.

Butwhatparticularlypuzzledscientistswas3thesebirdsbehavedbeforetheydied.Thebirdswere

observedsuddenlyflyingstraight4stationaryobjects(rockwallsandtrees),swimmingincircles,

andwiththeirwingsdrooped.Formanyyears,scientistsfromstateandfederalagenciestriedto

figureoutwhatwaskillingthebirdsandthetestingofsedimentanddeadbirdsataffectedwater

reservoirsforxenobioticcompoundsthatcauseAVM5(reveal)nothing.Necropsiesofthebirds’

brainsshowedwidespreadvacuolationofwhitematterofthecentralnervoussystemandspinalcord

whichexplainedtheiruncoordinatedbehaviour.

Earlystudiessuggestedthatanunknown,seasonalandenvironmentalneurotoxin6beresponsible.

Recently,apaperpublishedinthejournalSciencehaspinpointedtheexactneurotoxinresponsible

forthedeathofthosebalde