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Human beings are animals. We breathe, cat end digest, and reproduce-the same life{{U}} (71) {{/U}}common to all animals. In a biological laboratory, rats, monkeys, and humans seem very much the same. However, biological understanding is not enough:{{U}} (72) {{/U}}itself, it can never tell us what human beings are. {{U}} (73) {{/U}}to our physical equipment—the naked human body—we are not an{{U}} (74) {{/U}}animal. We are tropical creatures, {{U}} (75) {{/U}}hairless and sensitive to colD、We are not fast and have neither claws nor sharp teeth to defend ourselves. We need a lot of food but have almost no physical equipment to help us get it. In the purely physical{{U}} (76) {{/U}}, our species seems a poor{{U}} (77) {{/U}}for survival. But we have survived—survived and multiplied and{{U}} (78) {{/U}}the earth. Some day we will have a{{U}} (79) {{/U}}living on the moon, a place with neither air nor water and with temperatures that turn gases into solids. How can we have done all these things Part of the answer is physical. {{U}} (80) {{/U}}its limitations, our physical equipment has some important{{U}} (81) {{/U}}. We have excellent vision and hands that can{{U}} (82) {{/U}}objects with a precision unmatched by any other{{U}} (83) {{/U}}. Most importantly, we have a large brain with an almost{{U}} (84) {{/U}}number of neural{{U}} (85) {{/U}}. We have used this physical equipment to create culture, the key to our survival and success. If we live in theArctiC、we supply the warmth our tropical bodies need{{U}} (86) {{/U}}clothing, shelter, and{{U}} (87) {{/U}}heat. If a million people want to live in a desert that supplies natural food for only a few hundred, we find water to grow food and{{U}} (88) {{/U}}deficits by transporting supplies from distant places. Inhabitants of our eventual moon colony will bring their own food and oxygen and then create an artificial earth environment to supply necessities. With culture, we can overcome our natural limitations. It was not always{{U}} (89) {{/U}}. 0ur distant ancestors were just animals, faced with the limits of their physical equipment. They had no{{U}} (90) {{/U}}and lacked the physical capacity to use it. |
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One key question for the next century is how we will provide energy in an environmentally sound way. As living standards rise in the developing world, energy consumption will increase.As a result, many countries are now opening the door for private investment in a sector that used to be solely the preserve of government. In the developed world too, the move is towards the deregulation end privatization of electricity generation and distribution. There is also a trend towards locally-generated energy, particularly in the developing worlD、Factories and shopping centers may one day have their own power sources. Progress is also being made in minimising the environmental impact of energy production and consumption.A、motor car today puts out perhaps 5 percent of the pollution a new car did in 1970. We can produce clean power too— but it costs, so to some extent, in the new millennium(一千年) we’re going to have the environment we can afforD、 The spectre of scarce or impossibly expensive energy is no longer with us. thanks to a combination of opening up new regions of the world and new technologies. Shortage is very unlikely.Environmental considerations mean there is a seriousness too about alternative energy sources that wasn’t there ten years ago. Right now the fuel cell is at the top of the list of alternative technologies.Advances in turbine transportation mean that natural gas is going to have an ever-increasing role. Nuclear power may prove competitive enough to have a much longer life than many expect, but until there’s a major change in public sentiment, I don’t expect m see much new nuclear construction. Will the grip of oil on personal transportation continue Sport-utility vehicles like Land Rovers and Jeeps are hardly the perfect means of urban transport.But people have become very attached to their automobiles. So until we get around to technology where we beam ourselves arounD、I suspect we’ll continue to have them. One area which is certainly not clear is the impact of the Internet on transportation. On the one hand, you will be able to accomplish by sitting in front of a screen what you used to have to go to the airport for: on the other, increased knowledge may well fuel a rising demand for travel. We are only at the beginning of a revolution that is already being called a bigger revolution than the internal combustion engine (内燃机). |
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Most people who develop Lyme disease, a tick-borne infection that’s endemic in parts of the Northeast and Midwest, are easily cured by taking an antibiotic like doxycycline for a couple of weeks.But for years a debate has raged over what to do about patients whose symptoms (fatigue, mental confusion, joint pain) never seem to clear up. One small but vocal group of doctors and patient advocates believes that Lyme’s corkscrew-shaped spirochetes have tunneled deep into their victims’ bodies and can be eradicated only with intensive antibiotic treatment over many months.Another group believes, just as adamantly, that the bacteria are long gone, making further treatment with powerful antibiotics—which can lead to potentially fatal infections or blood clots—positively dangerous. Now comes word of two studies in the NewEngland Journal of Medicine that show that long-term antibiotic treatment is no better than a placebo for folks with chronic Lyme disease. Originally scheduled for publication in July, the research is part of a group of findings made public last week -just in time for the peak Lyme months of June and July. If confirmed by another major study that’s looking at chronic Lyme and antibiotics from a slightly different perspective, the results would seem to settle the question once and for all. Researchers fromBoston, New Haven,Conn., and Valhalla, N. Y., followed 129 patients who had previously been treated for well-documented eases of Lyme disease. Sixty-four were given antibiotics directly into their veins for a month, followed by two months of oral antibiotics. The others received dummy medications.A、third of the chronic Lyme patients got better while taking the antibiotics.But so did a third of those on the placebo. Indeed, the results were so similar that a monitoring board decided to cut the trials short rather than add more subjects to the test groups. Unfortunately, the debate over chronic Lyme has become so heated that no one expects the controversy to go away.But both sides may take comfort in the other findings that were released by the NewEngland Journal last week.After studying 482 subjects bitten by deer ticks in a part of New York with a lot of Lyme disease, researchers concluded that a singly 200-rug dose of doxycycline dramatically cut the risk of contracting the disease. That good news is tempered somewhat by the fact that 80% of patients who develop the infection don’t remember ever being bitten by a tick. (The bugs inject an anesthetic into the skin to mask the pain and in their nymph stage are so small—about the size of a poppy seed--that they are easily overlookeD、) There’s still plenty you can do to protect yourself in a Lyme-infested neighborhood: tuck your pants in your socks, sprayDEET on your clothing, check yourself and your kids for ticks.And if you develop a spreading red rash—particularly if it’s accompanied by joint pain, chills or confusion—make sure you see a doctor right away. The tick, as always, is to be vigilant without overreacting. |
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