单选题What is the author's attitude to the prospect of the lakes' environment?

单选题Which benefits have to be demanded'?______

单选题The writer develops his ideas in the three-paragraph passage by means of

单选题There is no question that some "greenwashing" is going on in the corporate world. Bayernwerk, a Bavarian utility, began selling "Aqua Power" last year when Germany began to let customers choose their electricity supplier. Bayernwerk markets Aqua Power as 100% green, renewable, hydroelectric energy. But any customer who signs up gets power from the same mix of sources as before: hydro, gas, coal and nuclear. Nothing changes except some accounting, and there is no net benefit to the environment. There is a benefit, though, to Bayernwerk, which charges more for Aqua Power and has been swamped with orders for it. Greenwashing takes many forms. "Companies often advertise themselves as environmentally friendly even though they might have some pretty hideous environmental records," says Jill Johnson of the group Earth Day 2000. California's PG&E, the utility that settled out of court after the real Erin Brockovich accused it of polluting groundwater, runs pro-environmental ads. But PG&E is due in court in November on charges of polluting wells in a second California town. "PG&E has a very good environmental track record," says spokesman Greg Pruett, citing recycling and waste reduction. Weyerhaeuser, the timber company, cuts old-growth trees in Canada but trumpets the 100 million tree seedlings it will plant this year. Overall, the greening of corporate America is real and has not been as hard to achieve as some environmental activists imagined. That is especially true for greenhouse gases and climate change, the focus of Earth Day 2000. "Now there is more recognition by companies that there may be an economic advantage to reducing emissions of greenhouse gases," says Paul Portney, president of the think tank Resources for the Future. More and more companies are changing the way they heat and light their buildings and design their factories to reduce greenhouse gas emissions as well as their energy bills. (Energy-efficiency upgrades can save a company roughly $1 per square foot of office or factory space every year. ) The reductions often exceed those called for in the 1997 international agreement on greenhouse warming called Kyoto Treaty, whose goal of reducing greenhouse emissions 7% from their 2000 levels is deemed so threatening to the economy by many oil, coal and chemicals companies that the White House does not dare to submit it to the Senate for ratification.

单选题That low moaning sound in the background just might be the Founding Fathers protesting from beyond the grave. They have been doing it when George Bush, at a breakfast of religious leaders, scorched the Democrats for failing to mention God in their platform and declaimed that a President needs to believe in the Almighty. What about the constitutional ban on "religious test(s)" for public office? the Founding Fathers would want to know. What about Tom Jefferson's conviction that it is possible for a nonbeliever to be a moral person, "find (ing) incitements to virtue in the comfort and pleasantness you feel in its exercise"? Even George Washington must shudder in his sleep to hear the constant emphasis on "Judeo- Christian values." It was he who wrote, "We have abundant reason to rejoice that in this Land ... every person may here worship God according to the dictates of his own heart." George Bush should know better than to encourage the theocratic ambitions of the Christian right. The "wall of separation" the Founding Fathers built between church and state is one of the best defenses freedom has ever had. Or have we already forgotten why the Founding Fathers put it up? They had seen enough religious intolerance in the colonies: Quaker women were burned at the stake in Puritan Massachusetts; Virginians could be jailed for denying the Bible's authority. No wonder John Adams once described the Judeo-Christian tradition as "the most bloody religion that ever existed," and that the Founding Fathers took such pains to keep the hand that holds the musket separate from the one that carries the cross. There was another reason for the separation of church and state, which no amount of pious ranting can expunge: not all the Founding Fathers believed in the same God, or in any God at all. Jefferson was a renowned doubter, urging his nephew to "question with boldness even the existence of a God." John Adams was at least a skeptic, as were of course the revolutionary firebrands Tom Paine and Ethan Allen. Naturally, they designed a republic in which they themselves would have a place. Yet another reason argues for the separation of church and state. If the Founding Fathers had one overarching aim, it was to limit the power not of the churches but of the state. They were deeply concerned, as Adams wrote, that "government shall be considered as having in it nothing more mysterious or divine than other arts or sciences.' Surely the Republicans, committed as they are to "limited government," ought to honor the secular spirit that has limited our government from the moment of its birth.

单选题Aristotle believed that the heavens were perfect. If they ever were, they are no longer. The skies above Earth are now littered with the debris of dead satellites, bits of old rockets and the odd tools dropped by a spacewalking astronaut. Such is the extent of the detritus that the first accidental collision between two satellites has already taken place. It happened in February 2009, when a defunct Russian Cosmos smashed into a functioning American Iridium, destroying both and creating even more space junk. To stop this sort of thing happening again, Vaios Lappas of the University of Surrey, in England, has designed a system that will remove satellites from orbit at the end of their useful lives—and as a bonus will scour part of the sky clean as it does so. Dr. Lappas's satellite-removal system employs a solar sail. As light from the sun hits the sail, it imparts a minuscule but continuous acceleration. When a satellite is first launched, the sail is angled in a way that causes this acceleration to keep the satellite in orbit. (Orbits gradually decay as a result of collisions with the small number of air molecules found even at altitudes normally classified as "outer space". ) Solar sails have yet to be used widely to propel spacecraft in this way—several earlier versions came unstuck when the sails failed to unfurl properly—but doing so is not a novel idea in principle. The novelty Dr. Lappas envisages is to change the angle of the sail when the satellite has become defunct. Instead of keeping the derelict craft in orbit, it will, over the course of a couple of years, drag it into the atmosphere and thus to a fiery end. Not only that, but the sail will also act like a handkerchief, mopping up microscopic orbital detritus such as flecks of paint from previous launches: A fleck of paint may not sound dangerous, but if travelling at 27,000kph (17,0OOmph), as it would be in orbit, it could easily penetrate an astronaut's spacesuit. A prototype of Dr. Lappas's design, called CubeSail, will be launched late next year. It weighs just 3kg (71b) and, when folded up, measures 30cm (12 inches) by 10cm by 10cm. Once unfurled, however, the sail will have an area of 25 square metres. If this prototype, which is paid for by EADS, a European aerospace company, proves successful, solar sails might be added to many future satellites. That would enable them to be removed rapidly from orbit when they became useless and would restore to the skies some measure of Aristotelian perfection.

单选题The writer holds the opinion that fantasies ______.

单选题What does the word "they" (Para. 4) refer to?

单选题It is found that insulin

单选题Why does the author mention "there is wide-spread uneasiness and confusion" (Line 4, Par

单选题At this point, most of us generally have a clue about the basics of staying in good health--eat well, exercise, don't drink too much and don't smoke. And plenty of research has been dedicated to exploring how failing on any of those fronts, or even more than one at a time, can be detrimental to overall health. Yet, for many people, those bad habits have a way of accumulating. And, according to a new study published this week in the Archives of Internal Medicine, their cumulative impact can be pretty grim. In an analysis of nearly 5,000 adults tracked for two decades, researchers found that stacking up these four bad habits can work together to prematurely age you by as much as 12 years. Looked at independently, the risky behaviors included smoking, a sedentary lifestyle, little consumption of fruit and vegetables and regular drinking--an average of three drinks per day for men, or two for women. When compared to people who had the most healthy habits--those who never smoked, exercised at least two hours per week, ate plenty of fruits and vegetables and didn't drink at all, or drank more moderately, those with all four bad habits had an increased risk of death equivalent to being 12 years older. In fact, the study authors say that compared with practicing none of these bad habits, the combined effect of all four behaviors tripled or even quadrupled the risk of death. As the Associated Press points out: Overall, 314 people studied had all four unhealthy behaviors. Among them, 91 died during the study, or 29 percent. A- mong the 387 healthiest people with none of the four habits, only 32 died, or about 8 percent. Of course, while these findings are stark, the notion that individual unhealthy behaviors can join forces to have a cumulatively negative impact is not new. Responding to the findings, Dr. Walter Willett, the chair of the Department of Nutrition at the Harvard School of Public Health, pointed out similar findings in the large scale Nurses' Health Study. Still, Willet said that the simple, common sense steps that people can take to improve their overall health bear repeating, and studies that hammer home these correlations are indeed worthwhile. Re- ferring to the new findings published this week, he wrote in an email to TIME, the "conclusions are profoundly important and worth replicating: healthy lifestyle practices that are modest and simple--specifically, not smoking, getting regular physical activity, eating a good diet and avoiding excessive alcohol consumption--can profoundly affect our chances of living to an old age./