单项选择题

According to the passage, which of the following statements is NOT true

A．Hacking is also known as computer break-in.
B．Experts on computer networks consider hacking nothing serious.
C．Hacking is a widespread concern.
D．Hacking is potentially disastrous.
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单项选择题
The word vandalizing in Line 17 means
A．"stealing".
B．"creating".
C．"destroying".
D．"updating".
单项选择题
The writer mentions a thief in the second paragraph
A．to show that a hacker is more dangerous than a thief.
B．to tell people that thieves like to steal computers nowadays.
C．to demand that a protective computer system should be set up against thieves.
D．to demonstrate that hackers and thieves are the same people.
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