ichseemstodisappearifyouturnyourheadinitsdirection.Thisisbecausewhenyouturnyourhead,youarelookingatthethingtoodirectly.Menonguarddutysometimesthinktheyseesomethingmovingtoonesideofthem.Whentheyturntolookstraightatit,theycannotseeitanymore,andtheybelievetheyweremistaken.However,thismistakehappensbecausethecenteroftheeye,whichisverysensitiveindaylight,isnotassensitiveasthesidesoftheeyeafterdark.59.Wedon’tknowthatoureyesareofgreatimportanceuntil________.A.wethinkaboutoureyesB.wecannotseeclearlyC.wewearglassesD.wehavetodomuchreading60.Accordingtothepassage,a________ismorelikelytobenearsighted.A.tailorB.doctorC.guardD.painter61.Peoplewhoarefarsighted________.A.cannotdoalotofcloseworkwithoutglassesB.canonlyseethingsthatareveryclosetotheireyesC.havedifficultyreadingabookiftheyholditatarm’slength