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ScientistsinCanadasaybigoceanfishhavealmostdisappearedfromtheworldsincethestartofindustrialfishinginthenineteen-fifties.Thescientistsfoundthatpopulationoflargefishliketuna;swordfishandcodhavedroppedbyninety
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ScientistsinCanadasaybigoceanfishhavealmostdisappearedfromtheworldsincethestartofindustrialfishinginthenineteen-fifties.Thescientistsfoundthatpopulationoflargefishliketuna;swordfishandcodhavedroppedbyninetypercentinthepastfiftyyears.
Thestudytooktenyears.Theresearchersgatheredrecordsfromfishingbusinessesandgovernmentsaroundtheworld.ThemagazineNaturepublishedthefindings.
Thescientistssaythecommonmethodcalledlonglinefishingisespeciallydamagingtopopulationsoflargefish.Thismethodinvolvesmanyfishinglinesconnectedtooneboat.Thesewirescanbeclosetoone-hundredkilometerslong.Theyholdthousandsofsharpmetalhookstocatchfish.
LonglinefishingisespeciallycommonintheJapanesefishingindustry.RecordsshowedthatJapaneseboatsusedtocatchabouttenfishforeveryone-hundredhooks.Thestudysayslonglinefishingboatsnowmightcatchonefishperhundredhooks.
Thescientistssayindustrialfishingcandestroygroupsoffishmuchfasterthaninthepast.Thestudysuggeststhatwholepopulationscandisappearalmostcompletelyfromnewfishingareaswithintentofifteenyears.
RansomMyersofDalhousieUniversityinNovaScotialedthestudywithBorisWormofDalhousieandtheUniversityofKielinGermany.MisterWormsaysthedestructioncouldleadtoacompletere-organizationofoceanlifesystems.MisterMeyerssaysthedecreasednumberoflargefishisnottheonlyworry.Hesaysevenpopulationsthatareabletoreproducedonotgetthechancetolivelongenoughtogrowasbigastheirancestors(祖先).Hesaysnotonlyaretherefewerbigfish,theyaresmallerthanthoseofthepast.
Americangovernmentscientistssayevenwiththebesteffortstoprotectfishpopulations,decreasesaretobeexpected.
小题1:Whereisthepassageprobablytakenfrom?

A.Astorybook.
B.Abusinessmagazine.
C.Anenvironmentreport.
D.Aneconomicsurvey.
小题2:Bigfishhavegraduallybeendisappearingespeciallybecause________.A.longlinefishingmethodisusedB.seawaterisgettingpollutedC.mankinddestroyst

吕长平回答:
  小题1:C小题2:A小题3:D小题4:C小题5:D文章主要讨论的就是大型鱼类的消失的原因小题1:C推理题。本文是关于海洋中大型鱼类越来越少,说明这是一个关于野生动物环境报告。小题2:A细节题。根据第三段...
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