题目内容
The colour systems used by scientists and artists are completely different. An artist will mix blue and yellow paint to get a shade of green; a scientist will mix green and red light to create yellow. The printed page in a magazine is yet another system.
Scientists recognize the light primaries(原色) are red, green and blue. When mixed, red and green light rays produce yellow, blue and green produce cyan, red and blue produce magenta. Red, green and blue mix to create white light. This colour model is used in computer monitors, television sets and theaters.
Most artists recognize red, yellow and blue as the three basic primary colours. These primaries are the pure colours which cannot be created by mixing any other colours.
In the print industry, cyan (青色) , magenta ( 紫红色) , yellow and black are used as the primary colours. When you mix all the colours, the result is grey.
1.How many colour systems are mentioned in the passage?
A. Two. B. Three. C. Only one. D. Four.
2.If a scientist wants to get yellow, he will probably
A. mix blue and green B. mix blue and red
C. mix red and green D. mix red, green and blue
3.Which of the following is NOT true?
A. Red, green and blue are used in television sets.
B. Most artists think red, yellow and blue are the pure colours.
C. In the print industry, if you mix all the colours, you will get gray.
D. Scientists agree with artists on the colour systems.
