1 . Most solar panels acquire sunlight from only one side, meaning they can acquire more or less of it depending on where the sun is in the sky. In recent years, they’ve become far more effective typically turning around 22 percent of the light they acquire into energy. In a new study published in the journal Joule on Tuesday, scientists put forth a way to increase that percentage even higher: double-sided solar panels that can move to follow the sun.
Basically, these panels can acquire sun from not only their sun-facing side but also from the light reflected off the ground onto their dark undersides. At the same time, a GPS allows them to move on an axis from east to west in order to always be pointed at a best angle to acquire the sun’s rays. Though double-sided solar panels and sun-following solar panels are both in use currently, models that combine the two technologies aren’t widely available for commercial use, Solar experts predict explosive growth in the market soon, though.
The study authors determined that these two-sided sun-tracking panels produce an average of 35 percent more energy than immobile single-panel systems, and are 16 percent more cost-efficient. That holds true even when accounting for changes in weather conditions.
“This means that investing in double-sided and tracking systems should be a safe bet for the foreseeable future, Carlos Rodriguez-Gallegos,” the study’s lead author said.
The same warnings for solar panels and their effect on the local environment apply to the double-sided, moving systems as well, if not more so. Lead used in solar panels can be one source of local pollution, and Dustin Mulvaney, an associate professor of environmental studies, told Earther in an email double-sided panels could mean “twice as much lead” as traditional solar systems.
Since these new panels are more energy efficient, they could save not only money but also land. That would require restructuring how solar contracts currently work.
1. What does most solar panels rely on to acquire sunlight?| A．The amount of sunlight. | B．The location of the sun. |
| C．The quality of solar panels. | D．The size of solar panels. |
| A．The sun’s rays. | B．The panels’ undersides. |
| C．The double-sided panels | D．The panels’ sun-facing sides. |
| A．Uncertain. | B．Supportive. | C．Doubtful. | D．Subjective. |
| A．Double-Sided Solar Panels that Follow the Sun | B．Advantages of the Double-Sided Solar Panels |
| C．Application of the Double-Sided Solar Panels | D．New Trends of Double-Sided Solar Panels |
2 . The icy beauty of the Arctic attracts thousands of visitors every year to see its wonderful wildlife, landscape and local cultures. Visitors can take ships on a voyage along the Arctic Ocean or take flights to cities along the Arctic edge. No matter how one gets there, they should wear warm clothes and get ready to take in the attractions.
“Travelling to the Arctic leaves an unforgettable impression on the visitor. Its vast expanse and the fragility of its environment are two things that really blow away people,” said Cheryl Rosa, the director of the US Arctic Research Commission.
Visitors to the Arctic Circle will have a lot of activities to choose from if they want to see all that the region has to offer. Hiking with snowshoes, dog sledding and kayaking are common activities. Visitors with sharp eyes are likely to spot polar bears. To get even closer to the animals of the sea, visitors can go polar snorkeling with seals. Of course, Arctic adventures aren't complete without viewing the wonders of the Arctic Circle's large glaciers and icebergs as well.
One of the most impressive attractions and maybe the most difficult to see is the Northern Lights, one of the seven natural wonders of the world. They are natural lights that glow a brilliant green and light up the horizon. Sometimes they appear as waves that dance across the sky in different colors.
The best places to view the Northern Lights are in Northern Norway, Sweden's Abisko National Park , Iceland, America's Alaska or Canada's Yukon, according to space.com. Charles Deehr, an expert at the University of Alaska Fairbanks' Geophysical Institute , recommended planning a trip between winter and spring, especially when there is a new moon.
Even though the Arctic is a popular tourist destination, don't forget that people live here too. “It is recommended that visitors go with tour groups that are respectful of Arctic residents (居民) and their culture,” said Rosa. “Too many people can disturb the small villages. Finding tour groups that work with local communities is important.”
1. The underlined part “blow away” in Paragraph 2 probably means “________”.| A．defeat | B．affect | C．move | D．impress |
| A．They only produce green light at night. |
| B．They are natural lights and hard to see. |
| C．They seldom occur between winter and spring. |
| D．The best time to view them is when there is a full moon. |
| A．Tour groups are not welcome among Arctic residents. |
| B．The Arctic's population has been rising in recent years. |
| C．Visitors should choose suitable tour groups when visiting. |
| D．Tour groups should get permission from local communities. |
| A．To inform visitors of local culture. |
| B．To recommend some activities to visitors. |
| C．To introduce a popular tourist destination. |
| D．To share a travel experience in the Arctic. |
3 . When he was two years old, Ben stopped seeing out of his left eye. His mother took him to the doctor and soon discovered he had cancer in both eyes. After possible treatments failed, doctors removed both his eyes. For Ben, vision was gone forever.
But by the time he was seven years old, he had developed a technique for feeling the world around him: he clicked with his mouth and listened for the returning echoes. This method enabled Ben to determine the locations of open doorways, people, parked cars, garbage cans, and so on. He was echolocating: bouncing his sound waves off objects in the environment and catching the reflections to build a mental model of his surroundings.
Echolocation may sound like an improbable feat for a human, but thousands of blind people have perfected this skill, just like Ben did. The event has been written about since at least the 1940s, when the word ''echolocation" was first invented in a science article titled “Echolocation by Blind Men , Bats, and Radar.”
How could blindness give rise to the amazing ability to understand the surroundings with one's ears? The answer lies in a gift on the brain; huge adaptability.
Mother Nature filled our brains with flexibility to adapt to circumstances. Just as sharp teeth and fast legs are useful for survival, so is the brain's ability to reset, which allows for learning, memory, and die ability to develop new skills.
In Ben's case, his brain's flexible wiring repurposed his visual cortex for processing sound. As a result, Ben had more neurons available to deal with listening information, and this increased processing power allowed Ben to interpret soundwaves in shocking detail. Ben's super-hearing proves a more general rule: the more brain area a particular sense has, the better it performs.
1. How did Ben “see” after he had his eyes removed?| A．By using a walking stick. | B．By asking others for help. |
| C．By inventing a new system. | D．By echolocating surroundings. |
| A．Skill. | B．Task. | C．Sense. | D．Invention. |
| A．He laughs best who laughs last. | B．Actions speak louder than words. |
| C．God shuts one door but he opens another. | D．Man becomes learned by asking questions. |
| A．Culture Shock. | B．Human Biology. |
| C．Scientific Technology. | D．Environmental Protection. |
4 . At every turn in the Netherlands, the future of sustainable(可持续的) agriculture is taking shape—not in the meeting rooms of big companies but on thousands of modest family farms.
You can see it vividly on the farm run by Ted Duijvestijn and his brothers. At the Duijvestjns' 36-acre greenhouse near the old city of Delf, visitors wander among the deep green tomato plants, 20 feet tall. Rooted not in soil but in materials made from leaves and stalks, the plants are heavy with tomatoes—15 varieties in all—to suit the taste of the most demanding customers.
Since 2004, the Duijvestijns have declared resource independence on every front. The farm produces all of its own energy and fertilizer and even some of the packaging materials necessary for the crop's distribution and sale. The growing environment is kept at perfect temperatures year-round by geothermal heat(地热) that can be found under at least half of the Netherlands. Only rainwater is used for irrigation. Each kilogram of tomatoes from their plants requires less than 15 kilograms of water, compared with 61 kilograms for plants in open fields. Once each year the entire crop is regrown from seeds, and the old plants are processed to make packaging materials. The few pests that manage to enter the greenhouse are greeted by an army of fierce insects that shows no interest in tomatoes. The nutrition in the soil can be improved by growing plants that work with certain bacteria to produce their own fertilizer. In short. it's an entirely self-contained food system.
“Look at the island of Bali in Indonesia!” Ted explains. “For at least a thousand years, its farmers have raised ducks and fish within the same rice field. It's irrigated by the canal systems sculpted by human hands along mountains. They are our model.”
1. What can we learn about the Duijvestijns' tomatoes?| A．Their color is deep green. | B．There are 15 on each plant. |
| C．They are very tasty. | D．They grow in rich natural soil. |
| A．does not have insects | B．is heated by solar energy |
| C．produces its own chemical fertilizer | D．consumes much less water |
| A．Independent. | B．Reliable. |
| C．Satisfying | D．Separated. |
| A．He is attracted to its canal systems. | B．He will also raise ducks in his farm. |
| C．He wants to see the beautiful island. | D．He appreciates its farming methods. |
5 . If you're British or live in a Commonwealth nation, Christmas doesn't end on December 25.The day after Christmas is known as Boxing Day, and the relaxing holiday is a chance to allow the celebration for one more restful day.
But its name has nothing to do with the sport of boxing, and unlike the popular idea, did not appear from a need to return unwanted gifts or clean up trash produced by Christmas gifting.
There are several theories as to how that charitable tradition became known as "boxing".Some historians link the use of the term to boxes of donations that were laid in churches during the pre-Christmas season of Advent in the early days of Christianity during the second and third centuries A.D.The day after Christmas, the boxes were opened and the money was given away to the poor.
Another possible story for Boxing Day has to do with a tradition that formed in 19th century Victorian England, where servants sacrificed（牺牲）time with their own families to cater to their employers on Christmas.On the day after Christmas, employers would give the servants a rare day off and send them home with leftovers from the family's Christmas feast for their service.
Though the reasons are lost to history, Boxing Day charity eventually fell out of tradition---and was replaced with physical and material pleasures.Today, the holiday is linked with sports, with major football rugby, and cricket matches and horse races taking place on December 26.
December 26 is also a big shopping day throughout the UK and the Commonwealth.The holiday kicks off what is known as " Boxing Week" , during which retailers（零售商）try to move old stock and shoppers compete for one last bargain of the year.In recent years, though, the American tradition of Black Friday---massive sales that take place the day after Thanksgiving each November---has become popular in the United Kingdom and has largely overshadowed Boxing Week.
1. What kind of festival was Boxing Day probably in the beginning?| A．A charitable festival. | B．A religious festival. |
| C．A sports festival. | D．A business festival. |
| A．Take care of. | B．Depend on. |
| C．Put up with. | D．Pick up. |
| A．It has become an online shopping day. |
| B．It has been replaced by Black Friday. |
| C．It only covers popular sports events. |
| D．It has become less important than before. |
| A．When Did Boxing Day Come into Being? | B．Why Did People Celebrate Boxing Day? |
| C．How Is Black Friday Celebrated in the UK? | D．Why Is Black Friday Popular in the UK? |
6 . I saw in my rearview mirror that a large SUV headed straight for my car at a breakneck speed. My heart and mind started racing, and panic (恐慌)instantly set in.
With fear in my voice, I started saying out loud, "Oh my goodness! Oh my goodness!", making my friend who was with me immediately scared and puzzled. I was sure that within mere seconds, we were going to be knocked from behind by a careless vehicle clearly going over 100 miles per hour in heavy traffic.
Unable to change lanes or speed up because of cars on all sides, I just prepared myself for the impact. But thank goodness, the driver missed hitting my car by an inch as he went into the lane beside me, nearly hitting another vehicle, tires screeching (刺耳声)and burning, filling the air with clouds of smoke. He continued dashing in and out of traffic, causing more near-collisions, and then quickly disappeared into the distance.
As I sat there surprised, loosening my fingers from the steering wheel, my friend and I began to talk about what if we had been hit. How life could have been changed in an instant(瞬间)or even ended.
I thought about my precious children, my husband, my family and things undone. I wondered whether I would have regrets if that had been my last day. I began to consider if I was truly enjoying and embracing(拥抱) my life, even if it hadn't turned out the way I thought it would or should. I couldn't help but ask myself if I was by accident taking for granted the pure blessing of waking up every morning and being given another day, and if I was spending time being unhappy because of difficult circumstances instead of living with joy.
1. Why was the author stuck in panic?| A．The road was too crowded. | B．A rude driver attacked her. |
| C．She drove at too high a speed. | D．An accident seemed to happen. |
| A．She took no action. | B．She sped up her car. |
| C．She gave others a warning. | D．She drove into another lane. |
| A．That day. | B．That car. |
| C．The author's life. | D．The author's family. |
| A．Behind bad luck comes good luck. | B．Love me, love my dog. |
| C．Live in the present moment. | D．Value our friends and family. |
7 . Granada is Spain’s most visited city, drawing tourists from all over the world, most of whom are eager to see the famous world heritage sites. Also, some people can enjoy the wonderful music and dance festivals there. Located in Spain’s most southern region, you are guaranteed lovely hot weather during the summer. However, as it is set at the foot of the Sierra Nevada Mountains, there is skiing during the winter, making it a popular destination all year round.
Centuries ago, Granada was once a city filled with hundreds of public baths. One of the few that remains undamaged dates back to(始于) the 11th century. However, Granada’s most popular attraction is the Alhambra. The name Alhambra means “red castle” because of the color of the stone, which is particularly beautiful at sunset. As you walk through its narrow streets and beautiful gardens, you will be able to experience the charm of this particular region.
Within the Alhambra is the Parador(旅馆) Granada, which is one of Spain’s most popular hotels. It was originally part of a palace and later turned into a convent(女修道院), it’s a place where you can calm your mind. Its tranquil courtyard and lovely views are some of the reasons why so many guests enjoy their stay.
Located on the hill not far from the Alhambra is Albaicin. This used to be an Arab silk market, but today the small streets are filled with shops selling local handicrafts. From Albaicin, there is a steep walk up to a church, but it’s well worth the effort. With the mountains in the background, you will be able to get a beautiful view.
Granada has its own airport with flights from London and Stansted, so flying out for a long weekend couldn’t be easier. Why not discover for yourself why so many people around the world love coming to this charming city ?
1. Why do so many tourists travel to Granada ?| A．To enjoy the famous festivals. | B．To visit the world heritage sites. |
| C．To learn about its old culture. | D．To experience the exciting skiing. |
| A．Because of the stones’ color. | B．Because of its heavy pollution. |
| C．Because of its government. | D．Because of its special position. |
| A．Broad. | B．splendid. | C．amazing. | D．Quiet. |
| A．To entertain readers. | B．To share experiences. |
| C．To advertise Granada. | D．To offer tour service. |
8 . There are many therapies (疗法) for depression, including medical treatment, psychotherapy and talk therapy. Having a range of treatment choices is a good idea because no single treatment works equally well for each of millions of sufferers. Choosing the most suitable treatment is important to them. Now researchers say a new therapy proven to relieve depression should be added to the established treatments. It's called nature therapy. "Interacting with nature can have positive effects on those with depression," says Ethan Kross, PhD, an expert who has studied the nature depression link.
A little exposure to nature helps all of us get our energy back, and it may have special benefit for those who are depressed.“It seems that, from our work, the restorative effect of nature seems to be stronger for individuals with depression," says Marc Berman, PhD, an assistant professor of psychology at the University of Chicago. That might be because they feel mentally exhausted, and being in nature re energizes them. However, Dr Berman has a strong warning. “We're not arguing that interacting with nature should replace clinically proven treatments for depression," he says, “Nor should those with clinical depression try to treat themselves.”
However, Berman and others say, interactions with nature could serve as a very effective supplementary treatment. Compared to adults with depression walking for 50 minutes in an urban setting, those who took a 50 minute walk in a natural setting were less depressed and had better memory skills.
Why does nature hold this special effect? Berman says, “In a natural environment, we can choose to think or not, and this choice is believed to help us rest our brains. You can then pay attention later, when you need to.”He adds, “It gives people more ability to concentrate, which is a big problem for those with depression. ”Nature provides an effective setting for resting our brains, unlike urban setting. Even in the most peaceful urban environment, you have to pay attention to such things as traffic and stoplights.
1. What can we learn about depression therapies from paragraph 1?| A．They focus on physical activity. |
| B．They pay no attention to interactions. |
| C．They mainly depend on natural environment. |
| D．They need to be tailored to different patients. |
| A．By making them feel energetic. | B．By reminding them to rest in time. |
| C．By taking the place of clinic treatment. | D．By covering up their mental problems. |
| A．Additional. | B．Traditional. | C．Controversial. | D．Essential. |
| A．An urban setting of restoring energy. |
| B．The positive role of nature in treating depression. |
| C．The popularity of using multiple ways to treat diseases. |
| D．An effective replacement of clinical therapy for depression. |
