Thecoloursystems(系统)usedbyscientis

        The colour systems (系统) 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 theater.
         Most artists recognize red, yellow and blue as the three basic primary colours. These primaries are the
pure colours which can not be created by mixing any other colours.
         In the print industry, cyan, magenta, yellow and black are used as the primary colours. When you mix all
the colours, the result is gray.

1. __________ on the colour systems.

[ ]

A. Scientists and artists have the same idea
B. Scientists agree with artists
C. Scientists and artists have different ideas
D. Some of their ideas are the same

2. How many colour systems are mentioned in the passage?

[ ]

A. Two.
B. Three.
C. Only one.
D. Four.

3. If a scientist wants to get yellow, he must _________.

[ ]

A. mix blue and green
B. mix blue and red
C. mix red and green
D. mix red, green and blue

4. Which of the following is NOT true?

[ ]

A. Red, green and blue are used in television sets.
B. If scientists want to get white, they will mix red, yellow and blue together.
C. Most artists think red, yellow and blue are the pure colours.
D. In the print industry, if you mix all the colors, you will get gray.

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