IV. Reading Comprehension: Please choose the BEST answer for each question.Reading ABlind people can “see” things by using other parts of their bodies. This fact may help us to understand ourfeelings about color. If blind people can sense color differences, then perhaps we, too, are affected by colorunconsciously.Manufacturers have discovered by experience that sugar sells badly in green wrappings, that blue foods areconsidered unpleasant, and that cosmetics should never be packaged in brown. These discoveries have growninto a branch of color psychology.Color psychology now finds application in everything from fashion to decoration. Some of our preferencesare clearly psychological. Dark blue is the color of the night sky and therefore associated with calm, whileyellow is a day color with associations of energy and incentive. For a primitive man, activity during the daymeant hunting and attacking, while he soon saw red as the color of blood and anger and the heat that came witheffort. And green is associated with passive defense and self-protection.Experiments have shown that colors, partly because of their psychological associations, also have a directpsychological effect. People exposed to bright red show an increase in breath, in heartbeat and in bloodpressure; red is exciting. Similar exposure to pure blue has exactly the opposite effect; it is a calming color.Because of its exciting meaning, red is chosen as the signal for danger, but closer analysis shows that a vividyellow can produce a more basic state of alarm. So fire engines and ambulances in some advanced communitiesare now rushing around in bright yellow colors.
31. According to the passage, our preferences for certain colors are __________.
(A) associated with our blood types
(B) dependent on our personalities
(C) are linked with our ancestors
(D) partly due to psychological factors