单项选择题

The main reason why business or government has not taken tough measures to stop hacking is that ______.

A．they will cost too much money
B．communication may be interrupted
C．hacking has not caused much damage
D．tough measures are illegal
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单项选择题
Find the same meaning as erase in the last sentence of the first paragraph.
A．Add.
B．Change.
C．Remove.
D．Store.
单项选择题
According to the passage, all the damage listed below could be done by a hacker EXCEPT ______.
A．entering into computers illegally
B．creating many electronic-age terms
C．removing computer systems
D．going through computer systems
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