[单项选择]The computer network is a creation of the electronic age. In a computer system, a hacker is worse than a thief entering your house. He could go through anyone’s electronic mail or add to, change, distort or delete anything in the information stored in the computer’s memory. He could even take control of the entire system by inputting his own instructions in the software. 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.
Hacking, our electronic-age term for computer break-in, is more and more in the news: A dissatisfied former insurance-company employee wipes out information from payroll files. A student sends out a "virus", a secret and destructive command, over a national network. The virus copies itself at lighting speed, jamming the entire network--thousands of commercial and government computer systems. Now exists the possibility of terrorism by computer. Destroying
A. Add.
B. Change.
C. Remove.
D. Store.

[单项选择]The computer network is a creation of the electronic age. In a computer system, a hacker is worse than a thief entering your house. He could go through anyone’s electronic mail or add to, change, distort or delete anything in the information stored in the computer’s memory. He could even take control of the entire system by inputting his own instructions in the software. 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.
Hacking, our electronic-age term for computer break-in, is more and more in the news: A dissatisfied former insurance-company employee wipes out information from payroll files. A student sends out a "virus", a secret and destructive command, over a national network. The virus copies itself at lighting speed, jamming the entire network--thousands of commercial and government computer systems. Now exists the possibility of terrorism by computer. Destroying
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 computer network should be set up against thieves.
D. To look into the case where hackers and thieves are the same people.

[单项选择]A computer network links computers together to allow users to share hardware, software, and (73)
A. resource B. file C. information D. data

[单项选择]A ______ is a computer communication network in a local area, which connects various computers.
A. Internet
B. MAN
C. WAN
D. LAN

[单项选择]Without computer network, it would be impossible to carry on ______any business operation in the advanced countries.
A. practically
B. preferably
C. precisely
D. possibly

[单项选择]What is the most common type of computer network used in companies
A. The databases of information.
B. The public access networks.
C. The super computer networks.
D. Intranets.

[单项选择]After our computer network （）for the third time that day, we all went home.
A. crashed
B. collided
C. smashed
D. fell

[填空题]A the creation of a new post
B a new computer system
C a change of management
D a move to new premises
E a salary increase
F the loss of a contract
G the introduction of a social programme
H a change in internal budgets.______

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