Hacking the computer network is a creation of the electric age,but it is based on old-fashioned trust.it cannot work without trust.a rogue loose in a computer system called hacker is worse than a thief entering your house.he could go through anyones electronic mail or add to,change,distort or delete anything in the information stored in the computers memory.he could even take control of the entire system by placing his own instructions in the software that runs it.he could shut the computer down whenever he wished,and no one could stop him.then he could program the computer to erase any sign of his ever having been there. 练习: A.to show that A.hacker is more dangerous than A.thief. C.to demanD.that A.protective computer system shoulD.be set up against thieves. 2.the worD.vandalizing in line 17 means B.creating. D.updating, A.hacking is also known as computer break-in. C.hacking is A.widespreaD.concern. 4.which of the following is not mentioneD.in the passage as an instance of attack by A.hacker? B.shutting down the computer whenever he wishes. D.spoiling A.system for air traffic. A.it will cause fear among the public. C.tough measures are illegal. 【参考答案】1. A 2.C 3. B 4. C 5. D
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