The availability to occupations depends also on shifts in the national economy and increasingly on economic developments worldwide. There are several ways to measure these effects, including the rate of unemployment, the international balance of trade, and the productivity of American workers. The unemployment rate is a standard measure of joblessness in a community, state, or nation as a whole. Computed by standards set by the United States Department of Labor, the measure is made by taking a random sample of households in an area. It is an estimate of the percentage of people who are not working but are looking for work. The unemployment rate has been said to under-represent the actual unemployed because those who have stopped looking for work are not counted. It is a comparable statistic from state to state, however, because it is computed in the same manner. Traditionally an unemployment rate of 4 percent is considered full employment because people quit, change jobs, or are fired regardless of the relative health of the economy. In contrast the national unemployment rate reached as high as 25 percent during the Great Depression of the 1930s. When unemployment is low, people work and receive payment. They in turn buy goods and services that keep the work force employed and growing. This is an expanding economy. When unemployment is high, there is less money to purchase goods and services because fewer people are working. Fewer goods are sold, and businesses lose money and reduce the number of workers. This is a contracting economy. The United States government has many safeguards for the economy. It cannot, however, prevent dislocations due to technological change. A manufacturing process can suddenly become obsolete when a new technology is developed. Economic hardship may occur in a region even though the same goods are still being produced. An example is the industrial Midwest in the early 1980s. Increasingly manufacturers, both in the United States and abroad, were using foreign steel to make products. More finished products were also being imported, replacing American-made goods. Many workers were laid off, causing disruption of normal economic activities. Meanwhile high-tech manufacturing processes were developing elsewhere. California’s so-called Silicon Valley, south of San Francisco, became famous for its computer-related goods and computer-assisted design amid manufacturing processes. This was of little benefit to workers displaced by the obsolescence of traditional manufacturing. Because of a lack of transferable skills, many could not make the change. Some workers were laid-off indefinitely, forcing them to accept jobs that paid less or imposing upon them essentially permanent unemployment. Leaders of American business and education are sensitive to these issues. Increasingly concerned with the productivity of the individual worker, business people and educators have formed alliances to save local jobs by improving the work force and by redesigning the curricula of schools and training centers to encourage the development of useful skills. Business people and educators in the United States
A. are mainly responsible for the health of the national economy.
B. are concerned more with the productivity of the individual worker.
C. are sensitive to the unemployment rate.
D. are concerned with the development of useful skills.
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Questions 21 to 22 are based on the following news. At the end of the news item, you will be given 10 seconds to answer the questions. Now, listen to the news. How many overseas visitors traveled to New York City in 20077
A. 6 million.
B. 8.5 million.
C. 46 million.
D. 28 million.
The availability to occupations depends also on shifts in the national economy and increasingly on economic developments worldwide. There are several ways to measure these effects, including the rate of unemployment, the international balance of trade, and the productivity of American workers. The unemployment rate is a standard measure of joblessness in a community, state, or nation as a whole. Computed by standards set by the United States Department of Labor, the measure is made by taking a random sample of households in an area. It is an estimate of the percentage of people who are not working but are looking for work. The unemployment rate has been said to under-represent the actual unemployed because those who have stopped looking for work are not counted. It is a comparable statistic from state to state, however, because it is computed in the same manner. Traditionally an unemployment rate of 4 percent is considered full employment because people quit, change jobs, or are fired regardless of the relative health of the economy. In contrast the national unemployment rate reached as high as 25 percent during the Great Depression of the 1930s. When unemployment is low, people work and receive payment. They in turn buy goods and services that keep the work force employed and growing. This is an expanding economy. When unemployment is high, there is less money to purchase goods and services because fewer people are working. Fewer goods are sold, and businesses lose money and reduce the number of workers. This is a contracting economy. The United States government has many safeguards for the economy. It cannot, however, prevent dislocations due to technological change. A manufacturing process can suddenly become obsolete when a new technology is developed. Economic hardship may occur in a region even though the same goods are still being produced. An example is the industrial Midwest in the early 1980s. Increasingly manufacturers, both in the United States and abroad, were using foreign steel to make products. More finished products were also being imported, replacing American-made goods. Many workers were laid off, causing disruption of normal economic activities. Meanwhile high-tech manufacturing processes were developing elsewhere. California’s so-called Silicon Valley, south of San Francisco, became famous for its computer-related goods and computer-assisted design amid manufacturing processes. This was of little benefit to workers displaced by the obsolescence of traditional manufacturing. Because of a lack of transferable skills, many could not make the change. Some workers were laid-off indefinitely, forcing them to accept jobs that paid less or imposing upon them essentially permanent unemployment. Leaders of American business and education are sensitive to these issues. Increasingly concerned with the productivity of the individual worker, business people and educators have formed alliances to save local jobs by improving the work force and by redesigning the curricula of schools and training centers to encourage the development of useful skills. Which of the following can be used as the best title of this passage
A. Employment and the Economy.
B. Unemployment and the Economy.
C. The National Economy of the U.S.
D. Unemployment Rate.
设f(x)在[a,b]上连续,在(a,b)内可导(a>0),f(a)=f(b)=1.证明:存在ξ,η∈(a,b),使得 abeη-ξ=η2[f(η)-f’(η)].
Just as Roman gladiators drank the blood of foes to gain strength, modem Olympians have infused the blood of their own to gain endurance. Blood doping, which tainted the triumphs of some Olympians, has at last been banned. Blood doping, in short, means withdrawal of one unit of a little more of blood from an athlete’s system about four to six weeks before a competition. The blood is then stored in a frozen state while the body replenished the lost blood through natural processes. The extracted blood is unfrozen and then pumped back into the athlete’s system just before the competition. This increases the body’s hemoglobin count, hereby increasing the capacity for oxygen delivery and raising the level of endurance. A recent colloquium on the ethics of blood doping, summarized in The Physician and Sports Medicine, cited eases of runners getting blood transfusions so they could run fast enough to qualify for Boston Marathon and of blood doping in dog and horse racing. Blood doping may be surprisingly common among world-class endurance athletes, especially cyclists and runners. Blood doping is cheating and it is now banned by the International Olympic Committee, but it is still impossible to test, and till sure checks are found, one can only count on the personal ethics of the sportspersons concerned. Does blood doping really work Buick et al. and Williams et al. have made some studies in the laboratory. In one study, 11 highly trained male track athletes underwent extensive treadmill testing before and alter phlebotomy with re-infusion of 900mi of antilogous freeze-preserved red cells. The blood doping increased the mean hemoglobin concentration 8% (from 15.1% to 16.3% gnm/100ml) , maximal oxygen consumption 5% , and running time to exhaustion 35%. In another study, 12 experienced male distance runners who received 920ml of antilogous blood had a mean 7% increase in hemoglobin concentration and a mean 45-second improvement in time on a 5-mile treadmill run, compared with results after they received 920m1 saline. In the third study, 9 male college students who received two units antilogous blood had a significant increase in hemoglobin concentration and maximal oxygen consumption on a cycle ergo-meter. It is reasonable to conclude that blood doping does work when properly performed in the laboratory. But does it work in the field The problem in determining if blood doping works in the field is that almost all the reports are anecdotal. Whether it works or not, blood doping as it was done for the U.S. Olympic cyclists is to be condemned. Three of the cyclists developed flu-like symptoms 36 hours after transfusion, and one of them, when asked about blood doping, said, "Yeah, I did it. I got sick and it ruined me for the Olympics." To be sure, some of the cyclists who blood-doped won medals, but so did some who refused blood doping. Likewise, not all Olympians who admitted to blood doping were medal winners: an Italian runner who blood-doped for the marathon said he ran poorly and the national cross-country team alleged to have blood-doped ran poorly. In short, one cannot tell from anecdotal reports whether or not blood doping works in the field. Blood doping increases the capacity for oxygen delivery by
A. enlarging muscle fibers.
B. increasing blood flow.
C. raising hemoglobin count.
D. making an athlete’s mind active.