练习:
1.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.
2.the worD.vandalizing in line 17 means
A.stealing.
B.creating.
C.destroying,
D.updating,
3.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.
4.which of the following is not mentioneD.in the passage as an instance of attack by A.hacker?
A.deleting information in the computers memory.
B.shutting down the computer whenever he wishes.
C.entering your house to steal.
D.spoiling A.system for air traffic.
5.one of the reasons why business or government has not taken tough measures to stop hacking is that
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