单项选择题

Questions 14 to 17 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions.
Which fonms was the basis for photography

A．Light darkens silver salt.
B．Light darkens common salt.
C．Light darkens silver.
D．Light darkens self-developing film.

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单项选择题

单项选择题

Questions 14 to 17 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Which fonms was the basis for photography 您的浏览器不支持 audio 元素。