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.
The first permanent picture was made by ______.

A．using a special paper
B．adding common salt to silver salt
C．tinting the temporary image
D．using a special piece of metal

<上一题目录下一题>

热门试题

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. The first permanent picture was made by ______. 您的浏览器不支持 audio 元素。