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 passage is based on the author's _______.
A．experience of the changes
B．admiration of the changes
C．analysis of the changes
D．hope for changes
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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