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如果期货价格上升，则基差一定下降。( )
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构成四级医疗事故的情形是
Basically, there are three types of fatigue: physical, pathological (由疾病引起的), and psychological. As you might suspect, each differs significantly from the others.When you exercise your body you produce waste products. Muscles, for example, discard lactic acid (乳酸) into the blood; cells dump in carbon dioxide. When these wastes reach a certain level in the blood, the brain is notified and your activity level drops. Excess wastes in the muscles may produce soreness. If the blood of a physically fatigued animal is injected into a rested animal, it will produce fatigue. The solution to this type of fatigue is simple — rest. That should revive you; if it doesn’t, another cause should be sought.Have you ever become involved in so many activities that you had to be in two places at once This is what happens when your body has a disease. The cells are overtaxed and cannot keep up with both fighting the disease and keeping you active. The result is fatigue. Some communicable diseases like the flu and colds are notorious for draining your energy. Other non-communicable diseases, like anemia (贫血), drain you because you are lacking an important body ingredient. Being overweight can cause pathological fatigue. It should be obvious that this type of fatigue is not going to go away without treatment. In a way, pathological fatigue is a lifesaver. It lets you know something is wrong and that you need rest. Even a poor diet can produce pathological fatigue. Frequently, people who go on crash diets develop pathological fatigue, and if the diet is not improved, they may do physical harm to their bodies.Here is the most common type of fatigue. Almost everybody experiences it now and then. Often, the cause is an emotional war you are waging with yourself or those around you. Some of these familiar factors can bring on psychological fatigue: worries, stress, lack of exercise, boredom, depression. If you know someone with psychological fatigue, would you advise him to rest No way! That might be fine for our other types of fatigue, but for this one, it’s deadly. If you are ever going to be able to cope with stress, depression, or worry, you need oxygen in your cells and a more optimistic attitude. Get out of the chair and do something! Believe it or not, many people throw themselves into physical labor like cleaning or carpentry to "defatigue" themselves. If you find yourself in a particularly stressful situation that you can’t physically escape, escape mentally. When fatigue continues, maybe you need to get to the root of the problem. What is the main topic 0f this passage（）
期货价格是连续不断地反映供求关系及其变化趋势的一种价格。( )
Aging poses a serious challenge to OECD countries.And early retirement places an unsustainable burden on (62) financing. There is no easy (63) to this problem, but delaying retirement could help.Retiring early has become so ingrained (根深蒂固的) in OECD countries that these days it is almost an individual professional (64) . It is even possible to drum (65) economic arguments in its favor: retirees spend money (66) save it, for instance, and are valuable for such sectors as tourism. Retiring early, some argue, frees up jobs for younger recruits and helps to (67) productivity. To many, retirement is a hard-earned right, and (68) the earlier the better.All very well, but the reality is quite (69) . Early retirement may seem like a worthy individual goal, but it is a socially (70) one, and, as far as public pensions are concerned, quite unsustainable. The (71) reason is that more people are retiring early and living longer. That (72) more retirees depending on the funding of those in work for their income. The (73) is worrying. In the next 50 years, low fertility rates (出生率) and rising life expectancy (平均寿命) in OECD countries will cause this old-age dependency rate to rise 74 in size. Public pension payments, which pay 30-80% of total retirement incomes in OECD countries, are expected to rise, (75) average, by over 3% percentage points in GDP and by 8% points in some countries. Such is the (76) on pension funds that there is a danger of today’s workers not getting the pensions they (77) or felt they paid for.Action is needed, (78) simply aiming to reduce the generosity (and cost) of public pensions, or trying to augment (扩大) the role of privately funded pensions within the system, though necessary steps, may be insufficient to deal with the dependency (79) . After years of advancing early retirement schemes to (80) redundancies and higher unemployment, many governments are now looking at (81) people to stay in work until they are older. Surely, the thinking goes, if we are healthier now and jobs are physically less strenuous (费劲的) and unemployment is down, then perhaps the present rate should rise anew. 78（）
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