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
Which of the following idioms may be used by the author as a suggestion for minimizing risks
A．More haste, less speed.
B．Don't put all your eggs into one basket.
C．Don't count your chickens before they are hatched.
D．Look before you leap.
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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