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
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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 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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