单项选择题

In the 2nd paragraph, what is compared to a "black hole"

A．Large swaths of digital heritage.
B．Vital cultural artifacts.
C．Important digital material.
D．The lack of information.
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单项选择题
Future generations may not find the digital material any more because of all of the following EXCEPT______.
A．the out-of-date preservation method
B．the problem concerning intellectual property rights
C．the nature of short-time online existence 9f the digital information
D．the difficulty in storing vast amount of information available online
单项选择题
If you want to have a high return, you will______.
A．avoid any risk investment
B．try low-risk investments only and avoid high-risk ones
C．try high-risk investments only and avoid low-risk ones
D．try both high-risk investments and low-risk ones
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