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 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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