1、OutbreaksofRiftValleyfeveroccurirregularlyinEastAfrica,severalyearsapart.Whenoutbreaksdooccur,theykillthousandsofcattle.Alivestockvaccineagainstthediseaseexistsbutisrarelyused.Itistooexpensiveforfarmerstouseroutinely,andsinceitisnoteffectiveuntilamonthaftervaccination,administeringitafteranoutbreakbeginshelpsverylittle.Nevertheless,expertspredictthatuseofthevaccinewillincreasesignificantlywithinthenextfewyears.
Whichofthefollowing,iftrue,providesthestrongestjustificationfortheexperts’prediction?
A.RiftValleyfeverisspreadbymosquitoes,buteachoutbreakissowidespreadthatitisimpracticaltocontrolitbyusinginsecticides.
B.WhenanoutbreakofRiftValleyfeveroccurs,unaffectedcountriesoftenrefusetoimportlivestockfromthecountriesaffectedbytheoutbreak.
C.Itwouldtakelessthanamonthforproducersofthevaccinetoadjusttheirproductionoperationstocopewithalargeincreaseindemand.
D.ManycattlefarmersinEastAfricaarenomadicorliveinremotevillages,andsuchfarmers,whohavelittleaccesstomodernveterinarymedicine,areparticularlyhardhitbyoutbreaksofRiftValleyfever.
E.Recentlypublishedresearchhasshownthatcertainidentifiableclimaticconditionsarealmostinvariablyfollowed,withintwotofivemonths,byanoutbreakofRiftValleyfever.
2、把以下文字翻译成英文：
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