单项选择题

The author implies that excitement over the digital revolution may be hindered by ______.

A．ignorance of the technology
B．robust economic growth
C．the economic realities of its practicality
D．economic problems of hi-tech companies
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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
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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