【尚友制造】36套阅读解析exer16

《【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.□BBeekeepersinBrazilhavenotusedprevenvemeasurestoprotecttheircolonies.□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