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For the first time in decades, doctors have begun making major changes in the treatment of lung cancer, based on research proving that chemotherapy can significantly lengthen life for many patients for whom it was previously thought to be useless.The shift in care applies to about 50,000 people a year in the United States who have early cases of the most common form of the disease, non-small-cell lung cancer, and whose tumors are removed by surgery. (46) Many of these patients, who just a few years ago would have been treated with surgery alone, are now being given chemotherapy as well, just as it is routinely given after surgery for breast or colon (结肠)cancer. The new approach has brightened a picture that was often bleak."The benefit is at least as good, and maybe better than in the other cancers," said Dr. John Minna, a lung cancer expert and research director at the University of Texas Southwestern Medical Center in Dallas. He said new discoveries were helping to eliminate doctors’ "nihilistic" attitudes about chemotherapy for lung cancer."The standard of care has changed," said Dr. Christopher G. Azzoli, a lung cancer specialist at Memorial Sloan-Kettering Cancer Center in New York.(47) A major impetus for the change came a year ago, when two studies presented at a cancer conference showed marked increases in survival in patients who received adjuvant (辅助的)chemotherapy, meaning the drugs were given after surgery. In one study of 482 patients in Canada and the United States, led by Dr. Timothy Winton, a surgeon from the University of Alberta, 69 percent of patients who had surgery and chemotherapy were still alive five years later, as compared with 54 percent who had just surgery. The patients were given a combination of two drugs, cisplatin and vinorelbine, once a week for 16 weeks.In the world of lung cancer research, a survival difference of 15 percentage points is enormous. (48) Overall, the patients given chemotherapy lived 94 months, versus 73 months in those who had only surgery--also a huge difference in a field in which a treatment is hailed as a success if it gives patients even three or four extra months.A second study, also announced at the conference last year, had similar findings, and so did a third, presented just a month ago at the annual meeting of the same cancer group, the American Society of Clinical Oncology,At major medical centers, doctors quickly began to put the results into practice.(49) "The findings were so stunning from these studies a year ago that they began to change the standard of care," said Dr. Pasi Janne, a lung cancer specialist at the-Dana Farber Cancer Institute in Boston. "Over the last year, the number of patients we’ve had referred here for adjuvant chemotherapy has gone up steadily."(50) But some doctors hesitated to make changes, Dr. Winton said, wanting first to see the studies published in a medical journal, which would mean the data had stood up to the scrutiny(仔细的检查) of editors and expert reviewers.Now, his study has become the first of the three to pass that test. It is being published today in The New England Journal of Medicine, along with an editorial by Dr. Katherine M. S. Pisters, a lung cancer specialist at the M. D. Anderson Cancer Center in Houston. Many of these patients, who just a few years ago would have been treated with surgery alone, are now being given chemotherapy as well, just as it is routinely given after surgery for breast or colon (结肠)cancer.
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[案例描述] 某大学食堂有男生200人，女生180人，26～49岁男性教师30人，女性教师10人；50～60岁教师男性5人，女性3人；一日三餐在学校集体用餐，实行包伙制。 请根据上述案例回答以下问题。 请问该人群的能量需要如何计算。
Success, it is often said, has many fathers--and one of the many fathers of computing, that most successful of industries, was Charles Babbage, a 19th-century British mathematician. Exasperated by errors in the mathematical tables that were widely used as calculation aids at the time, Babbage dreamed of building a mechanical engine that could produce flawless tables automatically. But his attempts to make such a machine in the 1920s failed, and the significance of his work was only rediscovered this century. Next year, at last, the first set of printed tables should emerge from a calculating "difference engine" built to Babbage’s design. Babbage will have been vindicated. But the realization of his dream will also underscore the extent to which he was a man born ahead of his time. The effort to prove that Babbage’s designs were logically and practically sound began in 1985, when a team of researchers at the Science Museum in London set out to build a difference engine in time for the 200th anniversary of Babbage’s birth in 1992. The team, led by the museum’s curator of computing, Doron Swade, constructed a monstrous device of bronze, iron and steel. It was 11 feet long, seven feet tall, weighed three tons, cost around $500 000 and took a year to piece together. And it worked perfectly, cranking out successive values of seventh-order polynomial equations to :31 significant figures. But it was incomplete. To save money, an entire section of the machine, the printer, was omitted. To Babbage, the printer was a vital part of design. Even if the engine produced the correct answers, there was still the risk that a transcription or typesetting error would result in the finished mathematical tables being inaccurate. The only way to guarantee error-free tables was to automate the printing process as well. So his plans included specifications for a printer almost as complicated as the calculating engine itself, with adjustable margins, two separate fonts, and the ability to print in two, three or four columns. In January, after years of searching for a sponsor for the printer, the Science Museum announced that a backer had been found. Nathan Myhrvold, the chief technology officer at Microsoft, agreed to pay for its construction (which is expected to cost $373 000 with one Proviso: that the Science Museum team would build him an identical calculating engine and printer to decorate his new home on Lake Washington, near Seattle). Construction of the printer will begin--in full view of the public--at the Science Museum later this month. The full machine will be completed next year. It is a nice irony that Babbage’s plans should be realized only thanks to an infusion of cash from a man who got rich in the computer revolution that Babbage helped to foment. More striking still, even using 20th-century manufacturing technology the engine will have cost over $830 000 to build. Allowing for inflation, this is roughly a third of what it might have cost to build in Babbage’s day-in contrast to the cost of electronic-computer technology, which halves in price every 18 months. That suggests that, even had Babbage succeeded, a Victorian computer revolution based on mechanical technology would not necessarily have followed. Which of the following statements is Not true
大豆油中的亚油酸含量大大高于α-亚麻酸。( )
For the first time in decades, doctors have begun making major changes in the treatment of lung cancer, based on research proving that chemotherapy can significantly lengthen life for many patients for whom it was previously thought to be useless.The shift in care applies to about 50,000 people a year in the United States who have early cases of the most common form of the disease, non-small-cell lung cancer, and whose tumors are removed by surgery. (46) Many of these patients, who just a few years ago would have been treated with surgery alone, are now being given chemotherapy as well, just as it is routinely given after surgery for breast or colon (结肠)cancer. The new approach has brightened a picture that was often bleak."The benefit is at least as good, and maybe better than in the other cancers," said Dr. John Minna, a lung cancer expert and research director at the University of Texas Southwestern Medical Center in Dallas. He said new discoveries were helping to eliminate doctors’ "nihilistic" attitudes about chemotherapy for lung cancer."The standard of care has changed," said Dr. Christopher G. Azzoli, a lung cancer specialist at Memorial Sloan-Kettering Cancer Center in New York.(47) A major impetus for the change came a year ago, when two studies presented at a cancer conference showed marked increases in survival in patients who received adjuvant (辅助的)chemotherapy, meaning the drugs were given after surgery. In one study of 482 patients in Canada and the United States, led by Dr. Timothy Winton, a surgeon from the University of Alberta, 69 percent of patients who had surgery and chemotherapy were still alive five years later, as compared with 54 percent who had just surgery. The patients were given a combination of two drugs, cisplatin and vinorelbine, once a week for 16 weeks.In the world of lung cancer research, a survival difference of 15 percentage points is enormous. (48) Overall, the patients given chemotherapy lived 94 months, versus 73 months in those who had only surgery--also a huge difference in a field in which a treatment is hailed as a success if it gives patients even three or four extra months.A second study, also announced at the conference last year, had similar findings, and so did a third, presented just a month ago at the annual meeting of the same cancer group, the American Society of Clinical Oncology,At major medical centers, doctors quickly began to put the results into practice.(49) "The findings were so stunning from these studies a year ago that they began to change the standard of care," said Dr. Pasi Janne, a lung cancer specialist at the-Dana Farber Cancer Institute in Boston. "Over the last year, the number of patients we’ve had referred here for adjuvant chemotherapy has gone up steadily."(50) But some doctors hesitated to make changes, Dr. Winton said, wanting first to see the studies published in a medical journal, which would mean the data had stood up to the scrutiny(仔细的检查) of editors and expert reviewers.Now, his study has become the first of the three to pass that test. It is being published today in The New England Journal of Medicine, along with an editorial by Dr. Katherine M. S. Pisters, a lung cancer specialist at the M. D. Anderson Cancer Center in Houston. A major impetus for the change came a year ago, when two studies presented at a cancer conference showed marked increases in survival in patients who received adjuvant (辅助的)chemotherapy, meaning the drugs were given after surgery
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