单项选择题

What did Dr. Edwin Land invent

A．A quick process of developing film.
B．A new kind of film.
C．An automatic printer.
D．A kind of camera that develops its own film.
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单项选择题
According to the passage, Mathew Brady is remembered today because ______.
A．he was a famous soldier
B．he took war photographs
C．he painted portraits
D．he designed a portable camera
单项选择题
The first permanent picture was made by using
A．special paper
B．silver salt
C．common salt
D．a special metal
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