单选题
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There are two ways to create colors in a photograph. One method, called additive, starts with three basis colors and adds them together to produce some other colors. The second method, called subtractive, starts with white light (a mixture of all colors in the spectrum) and, by taking away some or all other colors, leaves the one desired.
In the additive method, separate colored lights combine to produce various other colors. The three additive primary colors are green, red and blue (each providing about one-third of the wavelengths in the total spectrum). Mixed in varying proportions, they can produce all colors. Green and red light mix to produce yellow; red and blue light mix to produce magenta; green and blue mix to produce cyan. When equal parts of all three of these primary-colored beams of light overlap, the mixture appears white to the eye.
In the subtractive process, colors are produced when dye (as in paint or color photographic materials) absorbs some wavelengths and so passes on only part of the spectrum. The subtractive primaries are cyan (a bluish green), magents (a purplish pink), and yellow; these are the pigments or dyes that absorb red, green and blue wavelengths, respectively, thus subtracting them form white light. These dye colors are the complementary colors to the three additive primaries of red, green and blue. Properly combined the subtractive primaries and absorb all colors of light, producing black. But, mixed in varying proportions, they too can produce any color in the spectrum.
Whether a particular color is obtained by adding colored lights together or by subtracting some light from the total spectrum, the result looks the same to the eye. The additive process was employed for early color photography. But the subtractive method, while requiring complex chemical techniques, has turned out to be more practical and is the basis of all modern color films.

单选题 What does the passage mainly discuss?
【正确答案】 C
【答案解析】这段主要说明了两种制造色彩的方法:添加法和减去法。
单选题 Which of the following is closest in meaning to the phrase "passes on" as used in line 14?
【正确答案】 B
【答案解析】这句话的意思为:在减去的过程中,当染色吸收某些波长仅允许部分光谱穿过时,色彩便产生了。passes on意为“穿过”,与B.lets through同意。
单选题 What color filter would absorb red wavelengths?
【正确答案】 B
【答案解析】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)。
单选题 Which of the following is NOT a pair of additive and subtractive primary colors?
【正确答案】 C
【答案解析】参阅上题。
单选题 What explanation is given for the use of the subtractive method in modern color films?
【正确答案】 B
【答案解析】从最后一句可知:减去法尽管需要复杂的化学技术,却已成为更实用的方法,且为现代彩色胶片的基础。