更多"Can computer viruses ever be a forc"的相关试题:
[单项选择]Can computer viruses ever be a force for progress In the wild west of the online world, the archetypal baddies are computer viruses and worms. These self-replicating programs are notorious for wreaking havoc in the systems of unwary users. But, as in the west, not all gunslingers wear black hats. Some virus writers wish their fellow users well, and have been spreading viruses that are designed to do good, not harm.
Cheese Worm, which appeared a few weeks ago, attempts to fix computers that have been compromised by the Lion Worm. The Lion Worm is dangerous. It infects computers that use the Linux operating system, and creates multiple "backdoors" into the infected computer. It then e-mails information about these backdoors to people who wish to misuse that computer for nefarious purposes such as "denial of service" attacks on websites. (Such attacks bombard a site with so many simultaneous requests for access that it comes out with its hands up.)
That might sound like a good t
A. computer viruses might be a force for progress
B. computers are full of viruses and worms
C. computers are wild in the west
D. viruses are spreading online
[填空题]Viruses can reproduce on their own and destroy host cells while bacteria cannot.
[填空题]Gangs force can not penetrate political fields though they attempt to seize the country’s economic lifeline.
[单项选择]
Viruses can’t be transmitted by （1） and （2） is not a common route for virus infiltration.
（1）处应选择（）
A. booting a PC from an infected medium
B. accessing to ROM
C. opening an infected file
D. executing an infected program
[单项选择]It can be inferred that the labor force described in the passage is made up of ______. [A] those who account for over 60% of the total population of the whole country [B] persons who work at both permanent (永久) and full-time jobs [C] those over 16 years of age who are looking for work
[单项选择]Ever wonder why some people can sleep through just about anything, while others get startled awake at each and every bump in the night A new report in the August 10th issue of Current Biology, offers some insight: Sound sleepers show a distinct pattern of spontaneous brain rhythms. "We found that by measuring brain waves during sleep, we could learn a lot about how well a person’s brain can block the negative effects of sounds; the more sleep spindles your brain produces, the more likely you’ll stay asleep, even when confronted with noise," said Jeffrey Ellenbogen of Harvard Medical School.
During sleep, brain waves become slow and organized, Ellenbogen explained. Sleep spindles refer to brief bursts of faster-frequency waves. Those bursts of activity are generated by a portion of the brain called the thalamus (丘脑), which serves as a way station for most types of sensory information (everything except smell).
"The thalamus is likely preventing sensory information fro
A. Brain waves become slow and organized when we sleep.
B. We can measure brain waves during sleep.
C. A person’s brain can block the negative effects of sounds.
D. Sound sleepers show a distinct pattern of spontaneous brain rhythms.
[填空题]People can hardly ever observe a Rossby wave since it doesn’t occur on the surface and the process is very slow.
[单项选择]How can I ever concentrate if you （ ） continually （ ） me with foolish questions
A. have ... interrupted
B. had ... interrupted
C. are ... interrupting
D. were ... interrupting
[单项选择]How can I ever concentrate if you（）continually（）me with silly questions
A. have, interupted
B. had, interrupted
C. are, interrupting
D. were, interrupted
[单项选择]Why can’’t the library issue library cards to everyone who applies
A. Because it takes too long to process all the applications.
B. Because it is a library for special purpose.
C. Because its resources are limited.
D. Because there is a shortage of staff.
[填空题]Tourism can be a positive force if it is ______.
