People who cannot tell all colors apart are said to be color-blind. Most color-b
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People who cannot tell all colors apart are said to be color-blind. Most color-blind people can see yellows and blues, but confuse reds with green. It is very rare for a person to be blind to all colors, but they may see everything in shades of black, white and gray.
It is interesting to point out that many color-blind people don’t even realize that they are color-blind, they don’t know that the colors they are seeing and naming are not the actual colors that people with normal vision can see. This can be dangerous when a color-blind person confuses the red and green of a traffic light.
Color blindness is thought to be inherited（遗传）and although doctors have tested color blindness, there is no cure to treatment for it.
【小题1】There are four cards here, and each has two colors. Which card’s colors do you think a color-blind person can tell correctly?
| A．Red, Green | B．Green, Yellow | C．Red, Brown | D．Brown, Yellow |
| A．always knows how color-blind he is |
| B．often gives the wrong name of colors |
| C．see everything as the same color |
| D．can hardly see something of strong colors |
| A．it is crowded |
| B．it is a dark night |
| C．there are no traffic lights at the cross of the streets |
| D．the traffic light turns red |
| A．his old age |
| B．his poor eyesight |
| C．his parents or grandparents |
| D．his living condition |
| A．have found a way to prevent a person from getting color-blind |
| B．have found a way to free a person from his color blindness |
| C．have been able to tell whether a person is color-blind or not |
| D．have made it quite clear the cause of color blindness |
试题答案
【小题1】D
【小题2】B
【小题3】D
【小题4】C
【小题5】C
解析试题