Wetalkaboutpeoplebeing"color-blind"butveryfewofusare．Eventhosewhodescribethemselvesascolor-blindarenormallyjustcolorlack．Astronglycolor-blindpersonwillstillbeabletotell20differentcolors，comparedtothe

　　Wetalkaboutpeoplebeing"color-blind"butveryfewofusare．Eventhosewhodescribe themselvesascolor-blindarenormallyjustcolorlack．Astronglycolor-blindpersonwillstillbeabletotell20differentcolors，comparedtothe100orsothatnormal-sightedpeoplesee．

　　Pingelap，atinyislandinthePacific，isabeautifulspotbutonethathasagenetictrouble．ItisknownasColorBlindIslandbecausesomanypeoplewholiveonthisremoteislandcanonlyseeinblackandwhite．

　　Notbeingabletoseeincolorisbadenough．Butoneislander，Herrol，who'safisherman，alsostrugglesinfullsunlightbecauseallheseesisapainfulburnt-outimage．"Ifinditdifficulttogooutsideinthesun，"hesays，"becausewhenit'ssunnyIcannotseetodomywork．"

　　Butifbeingtrulycolor-blindisrare，whyisitthataround10% ofthepopulationofPingelaplireinatotallyblackandwhiteworld？

　　Well，weknowthatin1780thepopulationofPingelapwasallbutwipedoutbyatsunami．Asfewas20peoplesurvived，oneofwhomwastheking．It'sbelievedhehadageneticfaultthatcausescolor-blindnessandhepassedthisfaultontohismanygenerations．

　　Thereisoneadvantage．Herrolcanseewell，reallywell，inthedark．Sowhenitgetsdark，Herro1andhisfriendsgetintheirboatsandhuntflyingfish．Theyhangupflamingtorchesandthefishareattractedtotheflames．"Thistypeoffishingisfun，"Herrolsays，"especiallyifwecatchplenty．Soeventhoughit'shardworkweenjoyit．"

　　5．WhatisPingelapfamousas？___

　　A．Atinyisland．

　　B．Acolor-blindisland

　　C．Amentallytroubledisland．

　　D．Abeautifulisland．

　　6．WhatcanweinferaboutHerrol？___

　　A．Hemaystayathomewhenit'ssunny．

　　B．Heisinterestedinburnt-outimages．

　　C．Helikestakingphotosverymuch．

　　D．Hedoesn'tliveinPingelapanymore．

　　7．Whatwouldbethebesttitleforthetext？___

　　A．ThehistoryofPingelap

　　B．ThedisadvantageofHerrol

　　C．Theislandofcolorblindness

　　D．Theadvantageofcolorblindness．