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ID:30475829
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页数:10页
时间:2018-12-30
《【尚友制造】36套阅读解析exer16》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、www.sharewithu.comExercise16Questions1to3arebasedonthefollowingreadingpassage.OneadvantageofbreedingAfricanbeeswithotherbeetypes(Africanization)mayberesistancetothepara-siticmiteVarroajacobsoni,amajorthreattomodernLinebeekeeping.InpartsofEurope,thismiteisdevastatin
2、g5honeybeesandkillingmanycoloniesdespitepreventivemeasuresbybeekeepers.ButinBrazilVarroajacobsonihasbeenpresentinAfricanizedbeessince1972withoutthelossofasinglecolony,eventhoughbeekeepersthereundertooknopreventivemeasures.Themiteslayeggs10withinthebroodcellsofimmat
3、urebees,anddevelopingmitesfeedonthehemolymph(blood)ofbeepupae.ButfewermitesreproduceinAfricanizedbeesthaninEuropeanbees.SomeresearcherspointoutthatthisresistancemayberelatedtotheAfricanizedworkerbee's15shorterdevelopmentperiod,whichpreventssomemitesfromreachingmatu
4、rity.RecentlythemitehasbecomeaseriousproblemincoloniesofEuropeanbeesinNorthAmerica.Africanizationofthesebeesmaybethebestsafeguardagainstthisparasite.Forthefollowingquestion,considereachofthechoicesseparatelyandselectallthatapply1.Theauthorcitesallofthefollowingasev
5、idencethatAfricanizedbees'resistancetoVarroajacobsoniissuperiortothatofEuropeanbees:□AVarroajacobsoniiskillingmanybeecoloniesinEurope.□BBeekeepersinBrazilhavenotusedpreven vemeasurestoprotecttheircolonies.□CAtleastsomeEuropeanbeecolonieshavebeensavedbypreventivemea
6、sures.2.SelectthesentencethatindicatesonepossiblereasontheAfricanizedbeesinBrazilhavesuccessfullyresistedVarroajacobsoni.3.Theauthor'sargumentregardingtheresistanceofAfricanizedbeestoVarroajacobsoniwouldbemostweakenedifwhichofthefollowingweretrue?本文由尚友原创或整理www.shar
7、ewithu.com○AThebeesinBrazilwereresistantbeforebeingAfricanized.○BThenumberofbeecoloniesinNorthAmericanincreaseddramaticallywhereasthenumberinBrazilremainedunchanged.○CMitesfoundinEuropeanbeesreproduceatafasterratethanmitesofidenticalspeciesfoundinthebeesinBrazil.○D
8、Africanizedbeesretainmanyofthecharacteris-ticsofEuropeanbees.○EBeecoloniesinEuropecontinuetoproducegreaterquantitiesofhoneythandothoseinBrazil.Qu
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