2． In mathematic computing and computer applications, matrixes are used to arrange data into table form.
3．Deselect the text by clicking anywhere outside of the selected area on the page or pressing an arrow key on the keyboard.
4. 总线是计算机系统部件之间的电路，可以传输信号和电能。
5. 显卡是计算机的组成部分之一，它能够把视频数据转换成你在显示器上能看到的可视信息。
A computer virus is a computer program that is created to make and spread copies of itself. The program may however also be designed to have other effects on the systems it infects, ranging from the annoying to the disastrous.
Virus attacks are growing rapidly these days. According to BusinessWeek, the 76,404 attacks reported in the first half of 2003 nearly match previous year's total number . As new antivirus tools are more powerful than before, the virus writers are getting a lot smarter with newer and creative ways to attack network systems. Let's first examine some common virus types:
Basic Virus - a piece of software code that is developed to attack computers and network systems via email or Internet connections. It quickly replicates itself and gradually attaches to files, programs or the hard drive.
Trojan Horses - This is a program that doesn't replicate when entering a system but can be effectively used to open 'back doors.' Trojan Horses allow hackers to take control over a particular system or to steal very important data.
Worm - this type of virus is able to spread itself automatically over the network from one computer to the next. During a worm attack, users' computers get infected without even having to click open email attachment or any program, etc.
Since it is very difficult to avoid the virus, your best defense is a powerful antivirus program. In order to fight with such viruses, the software vendors should focus on making their products more robust. This may ask for a trade-off between user-friendliness and security. In specific cases it may require line-by-line inspection, code retooling and even systems automation to defend the installed programs.
Choose the best answer according to the passage
1)．A computer virus is a computer program that is created to make and spread of itself.
A．programs B．virus C．copies D．files
2)．Worm spread itself except by
A．network B．E-mail C．program D．hardware
3)．Antivirus program can scan and virus.
A．clean B．produce C．replicate D．make
4)．Trojan Horses .
A．quickly replicate itself and gradually attache to files, programs or the hard drive.
B．infect the computer without even having to click open email attachment or any program.
C．allow hackers to take control over a particular system or to steal very important data.
D．avoid the virus to attack computer.
5)．According to BusinessWeek, the attacks reported in the first half of 2003 nearly match previous year's total number .
A． 86,404 B．
(阅读选择）One great benefit of the Web is that it allows us to move information online that now resides in paper form. Several states in
Electronic commerce notches up month-by-month too. It is difficult to measure, because a lot of electronic commerce involves existing buyers and sellers who are simply moving paper-based transactions to the Web. That is not new business. Microsoft, for example, purchases millions of dollars of PCs online instead of by paper. However, that is not a fundamental change; it has just improved the efficiency of an existing process. The biggest impact has occurred where electronic commerce matches buyers and sellers who would not previously have found each other. When you go to a book site and find an obscure book that you never would have found in a physical bookstore, that is a new type of commerce.
Today, about half of all PCs are still not connected to the Web. Getting communications costs down and making all the software simpler will bring in those people. And that, in turn, will move us closer to the critical mass that will make the Web lifestyle everyone's lifestyle. One element that people underestimate is the degree to which the hardware and software will improve. Just take one aspect: screen technology. I do my e-mail on a 20-inch liquid crystal display (LCD) monitor. It is not available at a reasonable price yet, but in two years it will be. In ten years, a 20-inch LCD with much higher resolution will be commonplace. The boundary between a television set and a PC will be blurred because even the set-top box that you connect up to your cable or satellite will have a processor more powerful than what we have today in the most expensive PC. This will, in effect, make your television a computer.
Interaction with the Web also will improve, making it much easier for people to be involved. Today the keywords we use to search the Web often return to too many articles to sort through, many of them out of context. If you want to learn about the fastest computer chip available, you might end up getting responses instead about potato chips being delivered in fast trucks. In the future, we shall be either speaking or typing sentences into the computer. If you ask about the speed of chips, the result will be about computers, not potatoes. Speech recognition also means that you will be able to call in on a phone and ask if you have any new messages, or check on a flight, or check on the weather.
To predict that it will take over ten years for these changes to happen is probably pessimistic. We usually overestimate what we can do in two years and underestimate what we can do in ten. It will not be too long before the Web becomes as much a way of life as the car.
Choose the best answer according to Passage
1. Electronic commerce becomes a new type of commerce when
［A］ paperbased transactions are moved on to the Web
［B］ the efficiency of the existing process is improved by Internet
［C］ new buyers and sellers find each other on the Internet
［D］ a book site offers the books several bookstores have altogether
2. The use of computer will be as common as the use of cars when
［A］ governments begin to move administration on-line
［B］ electronic commerce causes a fundamental change
［C］ computer and communication become simpler and cheaper
［D］ the boundary between the computer and the TV disappears
3. What is the current problem with the Web according to the passage?
［A］ Too much information. ［B］ Lack of response.
［C］ Ineffective interaction. ［D］ Slowness of speed.
4. The example of potato chips is used to illustrate
［A］ the defect of computers at the present stage of development
［B］ the similarity between a computer chip and a potato chip
［C］ the richness of information available on the web
［D］ the irrelevant responses the web sometimes offers
5. The passage is mainly trying to show that
［A］ the web is becoming a way of conveying information
［B］ the web will bring about a new way of life
［C］ electronic commerce develops with the internet
［D］ interaction with the Web will become easier
