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
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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