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案例分析题User programs interact with the kernel through a set of standard （）. They request services to be provided by the kernel. Such services would include accessing a file: open close, read, write, link, or execute a file; starting or（）accounting records; changing ownership of a file or （） ; changing to a new directory; creating, （） , or killing a process; enabling access to hardware devices; and setting limits on system resources. Unix is a multi -user, multi -tasking operating system. You can have many users logged into a system simultaneously, each running many programs. It’s the kernel’s job to keep each process and user separate and to regulate access to （） , including cpu, memory, disk and other L/O devices. changing ownership of a file or （）
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People buy things with it.
For years, smokers have been exhorted to take the initiative and quit: use a nicotine patch, chew nicotine gum, take a prescription medication that can help, call a help line, just say no. But a new study finds that stopping is seldom an individual decision. Smokers tend to quit in groups, the study finds, which means smoking cessation programs should work best if they focus on groups rather than individuals. It also means that people may help many more than just themselves by quitting: quitting can have a ripple effect prompting an entire social network to break the habit. The study, by Dr. Nicholas Christakis of Harvard Medical School and James Fowler of the University of California, San Diego, followed thousands of smokers and nonsmokers for 32 years, from 1971 until 2003, studying them as part of a large network of relatives, co-workers, neighbors, friends and friends of friends. It was a time when the percentage of adult smokers in the United States fell to 21 percent from 45 percent. As the investigators watched the smokers and their social networks, they saw what they said was a striking effect—smokers had formed little social clusters and, as the years went by, entire clusters of smokers were stopping en masse. So were clusters of clusters that were only loosely connected. Dr. Christakis described watching the vanishing clusters as like lying on your back in a field, looking up at stars that were burning out. "It’s not like one little star turning off at a time," he said,"Whole constellations are blinking off at once. " As cluster after cluster of smokers disappeared, those that remained were pushed to the margins of society, isolated, with fewer friends, fewer social connections. "Smokers used to be the center of the party," Dr. Fowler said, "but now they’ve become wallflowers." "We’ve known smoking was bad for your physical health," he said,"But this shows it also is bad for your social health. Smokers are likely to drive friends away. " "There is an essential public health message," said Richard Suzman, director of the office of behavioral and social research at the National Institute on Aging, which financed the study. "Obviously, people have to take responsibility for their behavior," Mr. Suzman said. "But a social environment," he added, "can just overpower free will. " With smoking, that can be a good thing, researchers noted. But there also is a sad side. As Dr. Steven Sehroeder of the University of California, San Francisco, pointed out in an editorial accompanying the paper, "a risk of the marginalization of smoking is that it further isolates the group of people with the highest rate of smoking—persons with mental illness, problems with substance abuse, or both. \ Which of the following would be the best title for the text
案例分析题User programs interact with the kernel through a set of standard （）. They request services to be provided by the kernel. Such services would include accessing a file: open close, read, write, link, or execute a file; starting or（）accounting records; changing ownership of a file or （） ; changing to a new directory; creating, （） , or killing a process; enabling access to hardware devices; and setting limits on system resources. Unix is a multi -user, multi -tasking operating system. You can have many users logged into a system simultaneously, each running many programs. It’s the kernel’s job to keep each process and user separate and to regulate access to （） , including cpu, memory, disk and other L/O devices. It’s the kernel’s job to keep each process and user separate and to regulate access to （）
Largely for "spiritual reasons", Nancy Manos started home-schooling her children five years ago and has studiously avoided public schools ever since. Yet last week, she was enthusiastically enrolling her 8-year-old daughter, Olivia, in sign language and modern dance classes at Eagleridge Enrichment—a program run by the Mesa, Ariz. , public schools and taught by district teachers. Manos still wants to handle the basics, but likes that Eagleridge offers the extras, "things I couldn’t teach. " One doubt, though, lingers in her mind. why would the public school system want to offer home-school families anything A big part of the answer is economics. The number of home-schooled kids nationwide has risen to as many as 1.9 million from an estimated 345,000 in 1994, and school districts that get state and local dollars per child are beginning to suffer. In Maricopa County, which includes Mesa, the number of home-schooled kids has more than doubled during that period to 7,526, at about $ 4,500 a child, that’s nearly $ 34 million a year in lost revenue. Not everyone’s happy with these innovations. Some states have taken the opposite tack. Like about half the states, West Virginia refuses to allow home-schooled kids to play public-school sports. And in Arizona, some complain that their tax dollars are being used to create programs for families who, essentially, eschew participation in public life. "That makes my teeth grit," says Daphne Atkeson, whose 10-year-old son attends public school in Paradise Valley. Even some committed home-schoolers question the new programs, given their central irony., they turn home-schoolers into public-school students, says Bob Parsons, president of the Alaska Private and Home Educators Association. "We’ve lost about one third of our members to those programs. They’re so enticing. " Mesa started Eagleridge four years ago, when it saw how much money it was losing from home schoolers—and how unprepared some students were when they re-entered the schools. Since it began, the program’s enrollment has nearly doubled to 397, and last year the district moved Eagleridge to a strip mall (between a pizza joint and a laser-tag arcade). Parents typically drop off their kids once a week; because most of the children qualify as quarter-time students, the district collects $ 911 per child. "It’s like getting a taste of what real school is like," says 10-year-old Chad Lucas, who’s learning computer animation and creative writing. Other school districts are also experimenting with novel ways to court home schoolers. The town of Galena, Alaska, (pop. 600) has just 178 students. But in 1997, its school administrators figured they could reach beyond their borders. Under the program, the district gives home-schooling families free computers and Internet service for correspondence classes. In return, the district gets $ 3,100 per student enrolled in the program—$ 9.6 million a year, which it has used partly for a new vocational school. Such alternatives just might appeal to other districts. Ernest Felty, head of Hardin County schools in southern Illinois, has 10 home-schooled pupils. That may not sound like much— except that he has a staff of 68, and at $ 4,500 a child, "that’s probably a teacher’s salary," Fehy says. With the right robotics or art class, though, he could take the home out of home schooling. The statement "That makes my teeth grit," (Line 4, Paragraph 3) implies that______.
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