单项选择题

Which of the following is NOT mentioned in the passage as an instance of attack by a hacker

A．Deleting information in the computer's memory.
B．Shutting down the computer whenever he wishes.
C．Entering your house to steal.
D．Spoiling a system for air traffic.

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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.

单项选择题

The word vandalizing in Line 17 means

A．"stealing".
B．"creating".
C．"destroying".
D．"updating".