首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
As one works with color in a practical or experimental way, one is impressed by two apparently unrelated facts. Color as seen is
As one works with color in a practical or experimental way, one is impressed by two apparently unrelated facts. Color as seen is
admin
2017-03-25
45
问题
As one works with color in a practical or experimental way, one is impressed by two apparently unrelated facts. Color as seen is a mobile changeable thing depending to a large extent on the relationship of the color to other colors seen simultaneously. It is not fixed in its relation to the direct stimulus which creates it. On the other hand, the properties pf surfaces that give rise to color do not seem to change greatly under a wide variety of illumination colors, usually(but not always)looking much the same in artificial light as in daylight. Both of these effects seem to be due in large part to the mechanism of color adaptation mentioned earlier.
When the eye is fixed on a colored area, there is an immediate readjustment of the sensitivity of the eye to color in and around the area viewed. This readjustment does not immediately affect the color seen but usually does affect the next area to which the gaze is shifted. The longer the time of viewing, the higher the intensity, and the larger the area, the greater the effect will be in terms of its persistence in the succeeding viewing situation. As indicated by the work of Wright and Shouted, it appears that, at least for a first approximation, full adaptation takes place over a very brief time if the adapting source is moderately bright and the eye has been in relative darkness just previously. As the stimulus is allowed to act, however, the effect becomes more persistent in the sense that it takes the eye longer to regain its sensitivity to lower intensities. The net result is that, if the eye is so exposed and then the gaze is transferred to an area of lower intensity, the loss of sensitivity produced by the first area will still be present and appear as an "afterimage" superimposed on the second. The effect not only is present over the actual area causing the "local adaptation" but also spreads with decreasing strength to adjoining areas of the eye to produce "lateral adaptation. " Also, because of the persistence of the effect if the eye is shifted around from one object to another, all of which are at similar brightness or have similar colors, the adaptation will tend to become uniform over the whole eye.
The present selection has apparently been preceded by some explanation of______.
选项
A、some experiments with color pigments
B、the nature of color
C、the color properties of various surfaces
D、the mechanism of the eye’s adaptation to color
答案
D
解析
本题中,A、B、C三项都与文章的意思不符。从文中可知,D项“眼睛的颜色适应能力”符合文意。因此D项为正确答案。
转载请注明原文地址:https://kaotiyun.com/show/oqGO777K
0
考博英语
相关试题推荐
TheEuropeanParliamenthasbannedtheterms’Miss’and’Mrs.’______theyoffendfemalemembers.
ThelegendofPaulRevere’smidnightridethroughtheMassachusettscountrysidein1775isknowntomostAmericans,youngandol
AlthoughmanypeoplespeakEnglish,theydon’tpronounceitorspellthewordtheyusethesameway.TheUnitedStates,in【C1】__
Inamarketeconomy,itisimpracticalto______bigbankstoreducethequalificationtoprovidefinancialsupportforsmalland
DoingaPhDiscertainlynotforeverybody,andIdonotrecommenditformostpeople.However,IamreallygladIgotmyPhDra
Thelawofprivateinternationaltribunalswithrespecttoconflictsofinterestofarbitratorsisquiteextensive,albeitbyno
Duringthenormaldevelopmentofself,achildisaffectedbycertaininfluentialfactors.【R1】_____.Infantsformanattachment
AfricanAmericanwomen’ssearchforsocietalacceptanceoftenencompassesstrugglebetweennaturalandsociallyconstructedidea
Thoughnotbiologicallyrelated,friendsareas"related"asfourthcousins,sharingabout1%ofgenes.Thatis【C1】______astudy
随机试题
美国学者斯蒂芬.柯维在其著作“高效领导者的七种习惯”中有一段父子沟通失败的描述。“上学真是无聊透了。”“怎么回事?”“学的都是些不实用的东西。”“现在的确看不出好处来,我当年也有同样的想法,可是现在觉得那些知识还蛮有用的,你就忍耐一下吧!”“我已经耗了十年
A.位于腹膜后,正常时不易触及B.库瓦济埃征阳性C.上腹部剧烈疼痛,向背部放射,左腰部因淤血而发蓝,左季肋部和肋脊点有压痛D.上腹部肋下或左季肋部触及囊性肿物,位置固定,表面光滑,无压痛
在药物不良反应监测中占有极重要地位的监测方法是
幕墙中的铝合金材料与以下哪种材料接触时,可以不设置绝缘垫片或隔离材料?[2012-095,2011-091,2007—107]
“备案号”栏应填:“收货单位”栏应填:
以下关于个人征信安全管理的说法中正确的有()。
当发生危及贷款人安全的情形时,借款人应当( )。
对联,又称对子、楹联,是单独使用的对仗的句子,它是我国特有的文学形式。山东省境内旅游景区有许多名联,例如:对联1:与国咸休,安富尊荣公府第;同天并老,文章道德圣人家。对联2:铁板铜琶继东坡高唱大江东去;美芹悲黍冀南宋莫随鸿雁南飞。对联3:云雾润蒸华不
银行票据
WhyisitthatmostofuscanrememberourprecisesurroundingsthemomentthatwefirstlearnedofJohnFitzgeraldKennedy’sas
最新回复
(
0
)