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考研英语知识运用分类精讲科学技术类-(一)(总分：100.00，做题时间：90分钟)一、SectionⅠUseofEnglish(总题数：2，分数：100.00)AUFOisageneraltermusedforany"unidentifiedflyingobject"intheskywhichcannotbe(1)byanobserver.MostUFOsremain(2)assoevenaftertheyhavebeeninvestigated.TheUFOphenomenondatesback(3)thebeginningofrecordedhistory,butUFOsightingshave(4)increasedsincethemid1940s.FromUFOvideostoUFOpictures,storiesandotherreallife(5),thousandsofpeoplefromall(6)oflifeclaimtohaveseenthesemysteriousaerialphantoms.ManyUFOsightingsturnouttobenothingatall,mereairplanes,meteorsorcomets;(7)manysightingshavegoneunsolvedfordecadesorevencenturies.Theterm"flyingsaucer"cameinto(8)useafterAmericanKennethArnoldclaimedaUFOsightingonJune24,1947nearMountRainier,Washington.Arnoldclaimedtohaveseenasmanyasninebrightlylitobjectssoaring(9)the