The fact that blind people can "see" things using other parts of their bodies 【B1】______ their eyes may help us to understand our feeling about color. If they can 【B2】______ color differences then perhaps we, too, are affected by color unconsciously. Manufacturers have discovered by trial and 【B3】______ that sugar 【B4】______ badly in green wrappings, that blue foods, are considered 【B5】______ and that cosmetic (化妆品) should never be packaged 【B6】______ brown. These discoveries have grown into a whole 【B7】______ of color psychology that now finds application in 【B8】______ from fashion to interior decoration. Some of our 【B9】______ are clearly psychological. 【B10】______ blue is the color of the night sky and therefore associated 【B11】______ passivity and calm, while yellow is a day color with associations of energy and incentive (刺激) . For primitive man, activity during the day meant hunting and attacking, while he soon saw as red, the color of blood and rage and the heat that came with 【B12】______ And green is associated with passive defence and self-preservation. 【B13】______ have shown that colors, partly because of their physiological associations, also have a direct psychological effect. People 【B14】______ to bright red show 【B15】______ in heartbeat, and blood pressure; red is exciting. Similar exposure to pure blue has exactly the opposite effect; it is a 【B16】______ color. Because of its exciting connotations (涵义) , red was chosen as the 【B17】______ for er, but closer 【B18】______ shows that a vivid yellow can produce a more basic state of alertness and alarm, so fire engines and ambulances in some advanced communities are now 【B19】______ around in bright yellow colors that 【B20】______ the traffic dead.

A．sacrificed
B．revealed
C．exposed
D．discovered