单项选择题

Digital technologies really began to take form when ______.

A．DVD technology was introduced
B．it was used With photography
C．used in computing
D．information was encoded
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单项选择题
The example of photography is used to show ______.
A．how digital technology has replaced traditional film
B．the enormous storage advantages of digital technology
C．how digital technology has improved the quality of production
D．how economical it is to use digital technology since it stores so much
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