PassageThree
Questions31to35arebasedonthefollowingpassage.
Humanfeelingsareaffectedbycolourunconsciously.Manufacturershavediscoveredbytr ialanderrorthatsugarsellsbadlyingreenwrappings，thatbluefoodsareconsideredbyconsumersastasteless，andthatcosmeticsshouldneverbepackagedinbrown.Thesediscoverieshavegrownintoawholedisciplineofcolourpsychology.Someofourpreferencesareclearlypsychological.Darkblueisthecolourofthenightskyandthereforeassociatedwithquietandcalm：Whiteyellowisakeycolourinassociationwithenergy.Forprimitivemen，activityduringthedaytimemeanthuntingandattacking，whichhesoonsawred，thecolourofbloodandthefire.Soitwasnaturalthatgreen,thecomplementarycolourtored，shouldbeassociatedwithpassivedefence.Experimentshaveshownthatcoloursalsohaveadirectpsychologicaleffect.Peoplewhenexposedtobrightr ed，showanincreaseinbreathingrate，heartbeatandbloodpressure.Redisexciting.Similarexposuretopurebluehasexactlytheoppositeeffect，becauseitisacalmingcolour.Becauseredhasanimplicationofexciting，itwaschosenasthesignalfordanger.Someanalysisshowsthatavividyellowcanproduceamorebasicstateofalarm.Sofireenginesandambulancesinsomeadvancedcountr iesarenowrushingaroundinbrightyellowcoloursthatstoptr afficdeed.
Thepassageisabout______.
A.whycolouraffectshumans
B.colourandmanufacturers
C.colourandtr afficaccidents
D.howcoloursinfluencehumanfeelings
正确答案：D[解析]本文第一句话开篇点题。
