【正文】 than 350 climbers have successfully reached the peak. And they have plained about waiting for hours in the bottlenecks (狹窄路段 ) on the way to the peak, a situation that isn’t just unfortable — it’s cold and windy up there — but downright dangerous. If bad weather strikes, climbers can and do die. As a matter of fact, the dangerous crowds aren’t the only problem on Qomolangma. All those climbers need to bring a lot of gear— and much of them ends up being left on the mountain, sometimes even the peak itself. Mount Qomolangma is being the world’s largest dump. Here’s mountaineer Mark Jenkins writing in National Geographic about the state of Qomolangma: “The two standard routes, the Northeast Ridge and the Southeast Ridge, are disgustingly polluted with oxygen cans and torn tents everywhere.” But the good news is that some mountaineers are taking it upon themselves to clean up Qomolangma. Mountianeer Paul Thelen and his friend Eberhard Schaaf are part of the annual Eco Everest Expedition, which has been cleaning up rubbish from base camps to the peak since 2020. So far they’ve collected over 13 tons of garbage. Some of that rubbish is even being used for a higher purpose. As part of the Mount Everest 8844 Art Project, a group of 15 artists from Nepal collected tons of garbage brought down the mountain by climbers. They’ve transformed the cans and oxygen tanks— and in one case, part of the remains of a helicopter— into 74 pieces of art that have already gone on exhibition in Nepal’s capital. Part of the profit from sales will go to the Everest Peakers Association, which has helped collect tons of rubbish on the slopes of the mountain. 25. What does the underlined word “gear” mean? A. Equipment for climbing mountains. B.. The food climbers brought onto the mountain. C. Some important machines used for the bottlenecks. D. Some rubbish found on the mountain. 26. The group of 15 Nepali artists_________. A. created works of art using rubbish from Qomolangma B. were employed by the Everest Peakeers Association C. climbed Qomolangma and collected tons of trash D. painted 74 beautiful pictures of Mount Qomolangma’s peak 27． What can be the best title for the text? A. Eco Everest Expedition Proves Successful B. Qomolangma Has Bee A Huge Mess C. Test Yourself Against Qomolangma D. Recycle Rubbish On Qomolangma C The bed should be reserved as a place for sleep, but people tend to read an iPad a lot in bed before they go to sleep. Charles Czeisler, a professor at Harvard Medical School, and his colleagues got a small group of people for an experiment. For five days in a row, the people read either a paper book or an iPad for four hours before sleep. Their sleep patterns were monitored all night. Before and after each trial period, the people took hourly blood tests to paint a daylong picture of just how much melatonin (褪黑激素 ) was in their blood at any given time. When subjects read on the iPad as pared to the paper books, they reported feeling less sleepy at night and less active the following morning. People also took longer to fall asleep on the iPad nights, and the blood tests showed that their melatonin secretion (分泌 ) was delayed by an hour and a half. The researchers conclude in today39。s journal article that given the rise of ereaders and the increasingly widespread use of ethings among children and adolescents, more research into the longterm consequences of these devices on health and safety is urgently needed. Czeisler and colleagues go on, in the research paper, to note： “Reading an iPad in bed may increase cancer risk.” However, software has been developed that can reduce some of the blue light from the screens of phones and puters according to time of day, and there are also glasses that are made to filter (過濾 ) short wavelengths. While they seem like a logical solution for the nighttime tech users, it needs more research. 28. In Charles Czeislers experiment, all the subjects were asked to______. A. sit in a row and receive the strict tests B. have their sleep patterns observed all night C. read a paper book and an iPad at the same time D. have their blood tested per hour during the trial 29 The third paragraph tells us the iPad readers were likely to____________. A. feel less sleepy and tired in the day B. fall asleep more easily after reading C. bee less energetic the next morning D. have a lot more melatonin secretion 30. The special software recently developed can______. A. remove the blue light from your devices pletely B. help prevent eyes being harmed by short wavelength C. weaken the harm done by doing nighttime ereading D. be used in all the ethings widely and safely 31. Which of the following can be the best title for the text? A. No ereading in bed before sleep B. New software for night ereaders C. Wrong behaviors before bedtime D. No games on iPad in bed D See a cellphone cover that you like on Taobao? Fet about placing an order, paying the bill online and waiting for days for it to be delivered to you. In the near future, you39。ll be able to get it in minutes just by hitting “print” on your puter. You might find it hard to believe that you could actually “print” an object like you would a picture. But it is not that hard to understand how it would work. Just as a traditional printer sprays ink onto paper line by line, modern 3D printers spread material onto a surface layer by layer, from the bottom to the top, gradually building up a shape. Instead of ink, the materials the 3D printer uses are mainly plastic, resin(樹脂 ) and certain metals. The thinner each layer is— from a millimetre to less than the width of a hair— the smoother and finer the object will be. This may sound like a pletely new technology