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IPv6地址分为：单播地址、组播地址、多播地址与____等四类。
研究划分IP地址新技术的动力有两个：技术的要求和____。
Don"t talk: your cell phone may be eavesdropping. Thanks to recent developments in "spy phone" software, a do-it-yourself spook can now wirelessly transfer a wiretapping program to any mobile phone. The programs are inexpensive, and the transfer requires no special skill. The would-be spy needs to get his hands on your phone to press keys authorizing thedownload,but ittakes just a few minutes—about the time needed to download a ringtone. This new generation of user-friendly spy-phone software has become widely available in the last year—and it confers stunning powers. The latest programs can silently turn on handset microphones even when no call is being made, allowing a spy to listen to voices in a room halfway around the world. Targets are none the wiser neither call logs nor phone bills show records of the secretly transmitted data. More than 200 companies sell spy-phone software online, at prices as low as $50. Vendors are loath to release sales figures. But some experts claim that a surprising number of people carry a mobile that has been compromised, usually by a spouse, lover, parent or co-worker. Many employees, experts say, hope to discover a supervisor"s dishonest dealings and tip off the top boss anonymously. Max Maiellaro, head of Agata Christie Investigation, a private-investigation firm in Milan, estimates that 3 percent of mobiles in France and Germany are tapped, and about 5 percent or so in Greece, Italy, Romania and Spain. James Atkinson, a spy-phone expert at Granite Island Group, a security consultancy in Gloucester, Massachusetts, puts the number of tapped phones in the U.S. at 3 percent. Even if these numbers are inflated, clearly many otherwise law-abiding citizens are willing to break wiretapping laws. Spyware thrives on iPhones, BlackBerrys and other smart phones because they have ample processing power. In the United States, the spread of GSM networks, which are more vulnerable than older technologies, has also enlarged the pool of potential victims. Spyware being developed for law-enforcement agencies will accompany a text message and automatically install itself in the victim"s phone when the message is opened, according to an Italian developer who declined to be identified. One worry is that the software will find its way into the hands of criminals. The current embarrassment is partly the result of decisions by Apple, Microsoft and Research In Motion (producer of the BlackBerry) to open their phones to outside application-software developers, which created the opening for spyware. Antivirus and security programs developed for computers require too much processing power, even for smart phones. Although security programs are available for phones, by and large users haven"t given the threat much thought. If the spying keeps spreading, that may change soon. Which of the following is the best title for this text
Give the Senate some credit: in shaping the current immigration-reform bill, it has come up with one idea that almost everybody hates. That"s the plan to create a new class of "guest workers"—immigrants who would be allowed to work in the U.S. for three two-year stretches, at most, provided that they return home for a year after each visit. Conservatives dislike the plan because they believe that the guest workers won"t return home after their visas expire. Liberals dislike it because they believe the program will depress American wages and trap guest workers in a state of serfdom. The only vocal supporters of the provision are businesses that rely heavily on immigrant labor, and they"re presumably just looking out for themselves. With the broader concerns about the effects of illegal immigration, the hostility to the new plan is understandable. It"s also misguided. However imperfect, the guest-worker program is better than any politically viable alternative. Opponents of immigration sometimes imply that adding workers to a workforce automatically brings wages down. But immigrants tend to work in different industries than native workers, and have different skills, and so they often end up complementing native workers, rather than competing with them. That can make native workers more productive and therefore better off. According to a recent study by the economists Gianmarco Ottaviano and Giovanni Peri, between 1990 and 2004 immigration actually boosted the wages of most American workers; its only negative effect was a small one, on the wages of workers without a high-school diploma. And if by increasing the number of legal guest workers we reduced the number of undocumented workers, the economy would benefit even more. Guest workers are also, paradoxically, less likely than illegal immigrants to become permanent residents. The U.S. already has a number of smaller—and less well-designed—temporary-worker programs, and there"s no evidence that workers in those plans routinely overstay their visas. One remarkable study found that after border enforcement was stepped up in 1993 the chances of an illegal immigrant returning to his homeland to stay fell by a third. In fact, whatever benefits the guest-worker program brought to the U.S. economy or to particular businesses, the biggest winners would be the workers themselves. Congress, of course, is under no obligation to care about foreign workers. But the program"s costs to American workers are negligible, the gains for the guest workers are enormous, and the U.S. economy will benefit. This is that rare option which is both sensible and politically possible. What is the author"s attitude towards guest workers plan
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