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1、2007年12月大学英语六级考试试题及参考答案Part I Writing (30 minutes)The digital age1. 如今，数字化产品越来越多，如2. 使用数字化产品对于人们学习工作和生活的影响。Part II Reading Comprehension (Skimming and Scanning) (15 minutes) Seven way to Save the World Forget the old idea that conserving energy is a form of self-denialriding bicycles, dimming the li
2、ghts, and taking fewer showers. These days conservation is all about efficiency: getting the sameor betterresults from just a fraction of the energy. When a slump in business travel forced Ulrich Ramer to cut costs at his familyowned hotel in Germany, he replaced hundreds of the hotels wasteful ligh
3、t bulbs, getting the same light for 80 percent less power. He bought a new water boiler with a digitally controlled pump, and wrapped insulation around the pipes. Spending about 100,000 on these and other improvements, he slashed his 90,000 fuel and power bill by 60,000. As a bonus, the hotels lower
4、 energy needs have reduced its annual carbon emissions by more than 200 metric tons. “For us, saving energy has been very, very profitable,” he says. “And most importantly, were not giving up a single comfort for our guests.” Efficiency is also a great way to lower carbon emissions and help slow glo
5、bal warming. But the best argument for efficiency is its costor, more precisely, its profitability. Thats because quickly growing energy demand requires immense investment in new supply, not to mention the drain of rising energy prices. No wonder efficiency has moved to the top of the political agen
6、da. On Jan. 10, the European Union unveiled a plan to cut energy use across the continent by 20 percent by 2020. Last March, China imposed a 20 percent increase in energy efficiency by 2020. Even George W. Bush, the Texas oilman, is expected to talk about energy conservation in his State of the Unio
7、n speech this week.The good news is that the world is full of proven, cheap ways to save energy. Here are the seven that could have the biggest impact.InsulateSpace heating and cooling eats up 36 percent of all the worlds energy. Theres virtually no limit to how much of that can be saved, as prototy
8、pe “zero-energy homes” in Switzerland and Germany have shown. Theres been a surge in new ways of keeping heat in and cold out (or vice versa). The most advanced insulation follows the law of increasing returns: if you add enough you can scale down or even eliminate heating and air-conditioning equip
9、ment, lowering costs even before you start saving on utility bills. Studies have shown that green workplaces (ones that dont constantly need to have the heat or air-conditioner running) have higher worker productivity and lower sick rates.Change Bulbs Lighting eats up 20 percent of the worlds electr
10、icity, or the equivalent of roughly 600,000 tons of coal a day. Forty percent of that powers old-fashioned incandescent light bulbsa 19th-century technology that wastes most of the power it consumes on unwanted heat. Compact fluorescent lamps, or CFLS, not only use 75 to 80 percent less electricity
11、than incandescent bulbs to generate the same amount of light, but they also last 10 times longer. Phasing old bulbs out by 2030 would save the output of 650 power plants and avoid the release of 700 million tons of carbon into the atmosphere each year.Comfort Zone Water boilers, space heaters and ai
12、r conditioners have been notoriously inefficient. The heat pump has altered that equation. It removes heat from the air outside or the ground below and uses it to supply heat to a building or its water supply. In the summer, the system can be reversed to cool buildings as well.Most new residential b
13、uildings in Sweden are already heated with ground-source heat pumps. Such systems consume almost no conventional fuel at all. Several countries have used subsidies to jump-start the market, including Japan, where almost I million heat pumps have been installed in the past two years to heat water for
14、 showers and hot tubs.Remake Factories From steel mills to paper factories, industry eats up about a third of the worlds energy. The opportunities to save are vast. In Ludwigshafen, German chemicals giant BASF runs an interconnected complex of more than 200 chemical factories, where heat produced by
15、 one chemical process is used to power the next. At the Ludwigshafen site site alone, such recycling of heat and energy saves the company 200 million a year and almost half its CO2 emissions. Now BASF is doing the same for new plants in China. “Optimizing (优化) energy efficiency is a decisive competi
16、tive advantage,” says BASF CEO Jurgen Hambrecht.Green DrivingA quarter of the worlds energy-including two thirds of the annual production of oilis used for transportation. Some savings come free of charge: you can boost fuel efficiency by 6 percent simply by keeping your cars tires properly inflated (充气). Gasoline-electric hybrid(混合型的) models like the Toyota Prius improve mileage b
