What does the passage mainly discuss? What color filter would absorb red wavelengths?

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问题 What does the passage mainly discuss?
What color filter would absorb red wavelengths?

选项 A、Red.
B、Cyan.
C、Magenta.
D、Yellow

答案B

解析从第三段第二句可知：减去法的基础色为cyan(深蓝)，magenta(洋红)和yellow(黄)；这三种染色分别吸收红(red)，绿(green)，蓝(blue)。

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职称英语综合类B级

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