It may be worth investing in a season，monthly or annual ticket, rather than paying daily, or weekly, since it is usually cheaper than daily ticket.

A . re-adjust the discharge pressure B . clean the expansion valve screen C . add refrigerant D . adjust the expansion valve

A . Starting the disengaged windlass at high speed B . Rigging a bull rope to pull it out C . To grease the hawsepipe D . To pry it loose with a short piece of pipe

A . voip B . rfid tags C . data collection D . 802.11b and g client

A . to make something as good as human skin B . to produce drugs without side effects C . to transplant human organs D . to make artificial hearts and eyes

A . comb B . dumb C . numerous D . overcome

A . at close range B . at end on situation C . at head on situation D . at crossing situatio

A . doing B . make C . turn D . operating

A . capable B . payable C . reasonable D . probable

A . rot B . shrink C . stretch D . unlay

A . unburned carbon particles B . excess nitrogen C . a lack of oxygen D . excess hydroge

These who have a passion【C1】______climbing high and difficult mountains are often【C2】______with astonishment. Why are men and women【C3】______to suffer cold and hardship, and to【C4】______on high mountains？ This astonishment is caused, probably, by the difference between mountaineering and other forms of activity【C5】______which men give their leisure. Mountaineering is a sport and not a game. There are no man-made rules, as there are for【C6】______games as golf and football. There are, of course, rules of different kinds which it would be dangerous to【C7】______, but it is this freedom from man-made rules【C8】______makes mountaineering attractive to many people. Those who climb mountains are free to use their own【C9】______. If we【C10】______mountaineering with other more familiar sports, we might think that one big difference is【C11】______mountaineering is not a" team work". We should be mistaken in this. There are it is true , no" matches"【C12】______"teams" of climbers, but when climbers are on a rock face linked by a rope on which their lives may【C13】______, there is obviously teamwork. A mountain climber knows that he may have to fight forces that are stronger and more powerful than man. He has to fight【C14】______of nature. His sport requires high mental and【C15】______qualities. A mountain climber【C16】______to improve in skill year after year. A skier is probably past his best by the age of thirty, and most international tennis champions【C17】______in their early twenties. But it is not【C18】______for men of fifty or sixty to climb the highest mountains in the Alps. They may take more【C19】______than younger men, but they probably climb with more skill and less【C20】______of effort, and they certainly experience equal enjoyment. 【C1】 A．for B．in C．to D．of

A．high intelligence B．high prestige C．high operating ability D．high coordination ability

A．Islamic artists have had to create architectural decorations with images of flowers or geometric forms B．History teachers are more objective than general history C．It is more difficult to study art history than general history D．People and stories from the Bible were painted on churches and other buildings in order to popularize the Bible

Stephen Spindler and his colleagues from the University of California at Riverside have found that some of an elderly mouse's liver genes can be made to behave as they did when the mouse was young simply by limiting its food for four weeks. The genetic rejuvenation won't reverse other damage caused by time for the mouse, but could help its liver metabolize drugs or get rid of toxins. Spindler's team fed three mice a normal diet for their whole lives, and fed another three on half-rations. Three more mice were switched from the normal diet to half-feed for a month when they were 34 months old—equivalent to about 70 human years. The researchers checked the activity of 11,000 genes from the mouse livers, and found that 46 changed with age in the normally fed mice. The changes were associated with things like inflammation and free radical production—probably bad news for mouse health. In the mice that had dieted all their lives, 27 of those 46 genes continued to behave like young genes. But the most surprising finding was that the mice that only started dieting in old age also benefited from 70 percent of these gene changes. "This is the first indication that these effects kick in pretty quickly," says Huber Warner from the National Institute on Aging near Washington, D.C.. No one yet knows if calorie restriction works in people as it does in mice, but Spindler is hopeful. "There's attracting and tempting evidence out there that it will work," he says. If it does work in people, there might be good reasons for rejuvenating the liver. As we get older, our bodies are less efficient at metabolizing drugs, for example. A brief period of time of dieting, says Spindler, could be enough to make sure a drug is effective. But Spindler isn't sure the trade-off is worth it. "The mice get less disease, they live longer, but they're hungry," he says. "Even seeing what a diet does, it's still hard to go to a restaurant and say: 'I can only eat half of that'." Spindler hopes we soon won't need to diet at all. His company, Life Span Genetics in California, is looking for drugs that have the effects of calorie restriction. According to the passage, which of the following is NOT true？ A．Eating less than usual might make us live longer. B．If we go on a diet when old, we may keep healthy. C．Dieting might not be needed. ~ D．We have to begin dieting from childhood.

A．customer service in Israel is now improving B．wealthy Israeli customers are hard to please C．the tourist industry has brought chain stores to Israel D．Israeli customers prefer foreign products to domestic ones 此题为多项选择题。

A willful B wishful C hopeful D tactful

A．the trends which can be tracks B．the deployment of the blue line C．the overwhelming presence of criminals in London D．the number of the days of terrorist attacks

A．the coast was straight and unobstructed B．ships there had high masts C．coastal waters were safe D．the lighthouses were built on high places

A、hunter B、haunt C、predator D、editor