单项选择题

The fact that blind people can "see" things using other parts of their bodies apart from their eyes may help us to understand our feelings about color. If they can (1)_____ color differences, then perhaps we, too, are affected by (2)_____ unconsciously. Manufacturers have discovered by (3)_____ that sugar sells badly in green wrappings, (4)_____ blue foods are considered unpleasant, and the cosmetics should never be packaged (5)_____ brown. These discoveries have grown (6)_____ a whole discipline of color psychology that now finds (7)_____ in everything from fashion to interior decoration. Some of our (8)_____ are clearly psychological. Dark blue is the color of the night sky and (9)_____ associated with passivity and calm, while yellow is a day color with (10)_____ of energy and incentive. For primitive man, activity during the day (11)_____ hunting and attacking, while he soon saw as red, the color of blood and rage and the heat that came (12)_____ effort. And green is associated with passive (13)_____ and self preservation. Experiments have (14)_____ that green, partly bemuse of its physiological associations, also has a direct psychological (15)_____, it is a calming color. (16)_____ its exciting connotations, red was chosen as the signal for changer, (17)_____ closer analysis shows that a vivid yellow can produce a (18)_____ basic state of alertness and (19)_____, so fire engines and ambulances in some advanced communities are now (20)_____ around in bright yellow colors that stop the traffic dead.