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A、Light darkens silver salt. B、Light darkens natural salt. C、Light darkens silver. D、Light darkens self-developing film. Adiscov
A、Light darkens silver salt. B、Light darkens natural salt. C、Light darkens silver. D、Light darkens self-developing film. Adiscov
admin
2009-08-19
56
问题
Today, I’ll be talking about the invention of the camera and photography. The invention of the camera and photography changed our lives a lot. The camera is often thought to be a modern invention. But as early as 1727. a German physicist discovered that light darkens silver salt, a chemical compound. Using as a camera, a big box with small hole to let the light in, he made temporary images on the salt. Silver salt is still the base of film today.
Then a French scientist made the first permanent picture by using a special piece of metal sensitized with silver salt. A photograph he made in 1826 still exists. The painter, Daguerre improved on the process by placing common salt on the metal. This was in 1839, the official date of the beginning of photography, but the problem was the printing of the photographs, and it wasn’t until other scientists developed the kind of paper we now use, that good printing was possible and photograph became truly modem.
In 1860s, Mattew Bradey was able to take his famous pictures of the American Civil War. In the 20th century. George Eastman of the United States simplified film developing, and Dr. Edwin Land invented the so-called "instant" camera with self-developing film. If we say that photography came into existence in 1839, it follows that it has taken more than one hundred years for the camera to reach its present condition of technical refinement.
选项
A、Light darkens silver salt.
B、Light darkens natural salt.
C、Light darkens silver.
D、Light darkens self-developing film.
答案
A
解析
discovery was the basis of photography?
四个选项都是介绍某种事物的词,由此可以推测,本问题的中心可能是关于某种事物的描述。根据文中“a German physicist discovered that light darkens silver salt, a chemical compound... he made temporary images on the salt. Silver salt is still the base of film today.”德国物理学家发现了一种化学物质银盐,这种物质可以产生显影。由此推断,摄影的基础是银盐的发现。故正确答案为A)。
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0
大学英语六级
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