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 sense color differences, then perhaps we, too, are affected by color without knowing it. Salesmen have discovered by experience over a long period of time that sugar sells badly in green wrappings, that blue foods are considered not agreeable to the taste ,and that cosmetics (化妆品) should never be packed in brown. These discoveries have grown into a whole subject of color psychology (心 理学). Some of our preferences（偏爱）are clearly psychological. Dark blue is the color of the night sky and therefore connected with calm, while yellow is a day color connected with energy and en couragement. Experiments have shown that colors, partly because they are connected with psychology, also have a direct effect on people’s mind. People in bright red surroundings show an increase in breathing speed, heartbeat and blood pressure. Red i s exciting. Pure blue has exactly the opposite effect; it is a calming color. Being exciting, red was chosen as the signal for danger, but a closer study shows that a bright yellow c an produce a more basic state of alarm, so fire engines in some advanced areas are now rushing around in bright yellow colors that stop buses, trucks and cars. 53. The passage tells us that salesmen have _______. A. found out that colors affect sales B.discovered the relationship between color and psychology C. tried colors on blind people D. developed a special subject of color psychology 54. If people are exposed to (置身于) pure blue, _______. A. their body pressure rises          B.they won’t easily feel nervous C. they want to taste blue foods      D. they will feel like buying things 55. The most effective color in the passage for warning people is _____. A. red     B.bright yellow     C. dark blue     D. green 56. Which of the following do you think is the best title of the passage? A. Color and F eelings               B.Colors and Sales C. The B lind and Colors              D. Preferences for Colors