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 . As an astronomer(天文学家)，I am accustomed to observing the universe in quiet places. I observe galaxies in the deep universe-places so far away that their light takes billions of years to reach our eyes.
Sometimes I wonder what our own galaxy looked like billions of years ago, before solar system was born. I often stare at the Hubble Deep Field(哈勃深空区)searching for clues∶galaxies colliding(碰撞)，stars exploding，and stellar nurseries. Can looking to the stars bring us closer together?
A couple of months ago，Betelgeuse，a bright star in the Orion constellation(猎户座) started to get dimmer and dimmer. Astronomers all over the world thought this might be a signal that the star was about to explode. Though it might not happen for another 1000 years or more, still I went outside every night to check it out. I was hoping that it would explode. Imagine seeing a star shining as bright as the full moon even during the day.
I started dreaming about using such an event to remind everyone that stars produce nearly all of the chemical elements in the universe, which came directly out of the Big Bang. Everything we breathe, touch and see was made inside of stars. The iron in our blood, calcium bones, and almost the entire periodic table are products of stellar evolution.
Betelgeuse did not explode, and more recent observations note that it is actually returning to normal. But nothing is normal here on Earth now. I am beginning to realize that we did not need a star to explode to unite us. All we needed was a common problem.
I am hoping that everyone on the planet is saving some time to contemplate（凝视，沉思)the universe and to realize we are not alone. No matter where we are or who we are, we are on this planet together. Since we are all made of stars, looking up at the night sky gives us a glimpse of our past and our future, and we can contemplate both together.
1. Why does the author write this article?| A．To advise others to stare at a potentially exploding star recently. |
| B．To research into the scientific mystery in the universe with readers. |
| C．To discuss the proper relationship between human and the universe. |
| D．To suggest us thinking about the way human beings live in this world. |
| A．is a star the author tracked for years |
| B．will produce chemical elements if it explodes |
| C．is a normal star which is disappearing |
| D．will explode in ten thousand years |
| A．Betelgeuse's potential explosion |
| B．Betelgeuse's getting dimmer and dimmer |
| C．the author's checking out every night |
| D．a star's shining as bright as the sun |
| A．What should an astronomer do? |
| B．Should we know more about the universe? |
| C．Looking to the stars can bring us closer together. |
| D．Getting united is a problem impossible to solve. |
3 . While I was growing up, I often heard my teachers say, “Oh, Tina is gifted in algebra.” While watching the Olympics, my parents would say, “These gymnasts are born with such ability.” Statements like these made me believe people were born with certain talents and if they didn't have a particular one at birth, then they never would. Therefore, I rarely focused on algebra. Nobody told me that if you keep trying and trying, one day a difficult task will seem easy.
Actually, I learnt this from my young daughter, Samaya. One day, I was finishing some paperwork and I said, “Oh no, how could I have made that mistake!” Samaya instantly said, “Mum, don't worry. Mistakes make your brain grow bigger.”
Actually, we all need to be reminded that mistakes or failures are just fine and that they are a huge part of growth and success. However, the regular belief is the opposite. We must correct this with our children. We must encourage them to make mistakes because that means they are trying out new ideas.
Billionaire Sara Blakely, founder of the shapewear business Spanx, has seen many failures. She made a living by selling fax machines for seven years. Knocking on many doors and making a lot of mistakes was a journey she calls educational. Sara Blakely owes her risk-taking skills to the weekend talk she had with her father.
As a child, her father would ask her the same question every weekend. "What did you fail at this week, Sara?" He did not care how high her scores were. He wanted to know what she had tried but failed at. When she told him about her failures and mistakes, he would give her a high five. He was reprogramming her mind to believe that mistakes and failures are fine.
So go ahead and ask yourself and your children, “What did we fail at this week?”
1. What discouraged the author from efforts in algebra?| A．She wasn't interested in it. | B．She thought she was not gifted. |
| C．She thought it was useless. | D．She was not allowed to learn it. |
| A．Keep trying is necessary. | B．Failure is a path to success. |
| C．Mistakes are not acceptable. | D．Encouragement is significant. |
| A．To rebuild her mindset. | B．To keep her from failures. |
| C．To know what she hadn't tried. | D．To prevent her getting high scores. |
| A．A Secret to Success | B．A Method of Education |
| C．The Magic of Mistakes | D．The Power of a Fixed Mindset |
4 . Gold mining has rapidly increased across the Amazon in recent years, especially along the Guiana Shield, where it is responsible for as much as 90% of total deforestation (森林砍伐). Now, an international study has provided detailed information on the regeneration (再生) of forests in Guyana after gold mining.
The team found that forest recovery rates on abandoned mines are amongst the lowest ever recorded for tropical forests. At some sites there was nearly no tree regeneration even after three to four years since mining had stopped.
The study shows that tropical forests are strongly affected by mining activities, and have very little capacity to re-establish themselves. The mining process has removed almost all nitrogen from the soil, a critical component to forest recovery, and in many cases directly contributed to the presence of mercury (汞) within neighbouring forests and rivers. Active mining sites have on average 250 times more mercury concentrations than abandoned sites.
Not only does this have serious consequences for our battle against global warming by limiting Amazonian forests' ability to capture and store carbon, but there is also a larger implication of polluting food sources especially for local communities who rely on rivers.
Active management and enforcement of laws is clearly needed to ensure recovery and to safeguard communities. However, the current economic crisis is significantly increasing the demand for gold, given its role as an economic stabiliser. With current gold price estimated to rise in the coming months, many miners are already rapidly responding to this increase in pricing. And the weakening of environmental laws and policies is also leading to further deforestation.
The study analyzed soil samples to determine recovery and chemical changes caused by mining. Their results suggest that forest recovery is strongly limited by severe mining-induced depletion (损耗) of soil nutrients, especially nitrogen, rather than by mercury contamination. The high rate of mercury, however, does have serious implications for negative impacts on food security, water supply and local biodiversity.
Mr Gavin Agard, Commissioner of the Guyana Forestry Commission (GFC)said: “This scientific work will greatly improve Guyana's baseline and understanding of the forest degradation impacts of mining. The findings and recommendations from this study will significantly impact policy and management strategies for forest restoration and rehabilitation in mined-out areas.”
1. What does the underlined word “this” in paragraph 4 refer to?| A．The mining process. | B．The presence of mercury. |
| C．The mining-related deforestation. | D．The lack of nitrogen. |
| A．The rise of gold price. | B．Good economic situation. |
| C．Mercury pollution. | D．The strengthening of environmental laws. |
| A．Ambiguous. | B．Opposed. | C．Supportive. | D．Cautious. |
| A．Approaches to recovering forests on mined lands |
| B．Gold mining restricts Amazon rainforest recovery |
| C．Reasons for the poor rainforest recovery in Guyana |
| D．Strict environmental laws ensure rainforest recovery |
The Dutch research is one of three human studies that give strong scientific support to the long held belief that eating fish can provide health benefits, particularly to the heart.
Heart disease is the number-one killer in the United States, with more than 550,000 deaths occurring from heart attacks each year. But previous research has shown that the level of heart disease is lower in cultures that consume more fish than Americans do. There are fewer heart disease deaths, for example, among the Eskimos of Greenland, who consume about 14 ounces of fish a day, and among the Japanese, whose daily fish consumption averages more than 3 ounces.
For 20 years, the Dutch study followed 852 middle-aged men, 20 percent of whom ate no fish. At the start of the study, average fish consumption was about two-thirds of an ounce each day, with more men eating lean fish than fatty fish.
During the next two decades, 78 of the men died from heart disease. The fewest deaths were among the group who regularly ate fish, even at levels far lower than those of the Japanese or Eskimos.This relationship was true regardless of other factors such as age, high blood pressure, or blood cholesterol（胆固醇）levels.
1. In which section of a newspaper can we read this passage?
| A．Ads | B．Movies |
| C．Briefs | D．Health and Diet |
| A．the high incidence of heart disease in some countries |
| B．the changes in people’s diet |
| C．the effect of fish eating on people’s health |
| D．the daily fish consumption of people in different cultures |
| A．the amount of fish eaten | B．regular fish-eating |
| C．the kind of fish eaten | D．people of different areas |
| A．a heart doctor | B．a science researcher |
| C．a supporter of healthy eating | D．a university student |
6 . From the moment you open your eyes in the morning, you can feel sweat (汗水)running down your body, even if you’re barely moving at all. That’s what most people in China felt like this summer. In fact, the entire northern hemisphere(半球 )saw high temperatures in July. The Arctic Circle(北极圈) was no exception(例外). Temperatures in the city of Norilsk, which is in the Arctic Circle, reached a record high of 32 ℃, The Atlantic reported. Temperatures there are usually just 10 ℃ at this time of the year.
The heat wave in the Arctic is mainly a long-term result of global warming, according to the Chinese Academy of Meteorological Sciences. In fact, while the whole world is getting warmer, the Arctic is warming twice as fast as the rest of the planet. This is called the polar amplification effect(极地放大效应).
The most direct impact(影响) of Arctic warming is the melting of Arctic ice. According to NASA, Arctic sea ice is now disappearing at a rate of 13. 2 percent every 10 years. NASA said that if this continues, the Arctic will have no ice by the year 2040. This has put some Arctic animals, like polar bears, in danger. The ice that the bears live on has shrunk(缩小), the Toronto Star reported.
Melting ice can also cause sea levels to rise in the long term. Since 1993, sea levels have risen at a rate of 3. 2 cm every 10 years, the Guardian reported. Some countries, such as Tuvalu(图瓦卢) in the South Pacific Ocean and Maldives(马尔代夫) in the Indian Ocean, are at risk of disappearing into the sea.
1. Which of the following is true?| A．Some countries in the ocean will disappear in 10 years. |
| B．China is the hottest in the northern hemisphere this summer. |
| C．The temperatures in Norilsk used to be lower than this summer. |
| D．The world gets warmer because of the heat wave in the Arctic. |
| A．The heat wave in the Arctic. |
| B．The result of global warming. |
| C．Getting warmer in the world. |
| D．The Arctic getting warm faster. |
| A．The polar will become dangerous. |
| B．Sea levels rise in the long term. |
| C．There will be an end of water shortage. |
| D．There will be no ice in the world by 2040. |
| A．Heat hits Arctic. |
| B．Arctic animals are in danger. |
| C．The world became hotter than before. |
| D．Some countries may disappear into the sea. |
7 . If there was a subject at school that made me anxious, it was science. Maybe that’s because in my tenth grade, I couldn't understand my physics teacher's instructions, causing me to accidentally set fire to the classroom. So, when my husband and I decided to home-school our daughters, we made a deal: he would teach science, while I would handle everything else. But that’s not how things have been going these past few weeks, since my husband has been too busy to teach the girls.
Recently, while out on my morning hike before starting lessons, I noticed that the sky was a beautiful blue, and the air was filled with the sweet smell of flowers. That s why I decided that the day’s lessons would be taught outside, although I remembered that my daughters hadn't had any science classes from my husband for a while.
I returned to the house to get the girls ready. We headed up into the forest, settling ourselves by a pond that rarely has any visitors. My daughter Saoirse started to pick up pond weeds and catch frogs, while my other daughter Ula looked at me, waiting to be instructed. I handed her a drawing board and colored pencils. "We wait, "I told her, " and see if something comes along. In the meantime, just draw what's around you.”
We worked for more than an hour, hardly speaking. A bird flew across the water, and then settled in a front of a fallen tree. I quickly told Ula, worried that she’d not seen the creature. But she had, and she started drawing it. An hour later, she’d not finished her picture and I stared down at it. She drew the bird on her paper with amazing accuracy. But there was one other interesting fact about this drawing: she also drew me, sitting beside her.
I realized, as I stared at this child's drawing of us watching a bird, how I'd lived for 40 years, gathered 10 years of higher education, and never understood the foundation of science before this moment. The foundation of science is a sense of wonder; it isn't about accurately reciting words from a textbook. It is first and foremost about stepping outside our busy lives and amazing at the world around us.
1. How did the author feel about science when in school?| A．She was nervous about it. | B．She was fond of it. |
| C．She was confused about it. | D．She was eager for it. |
| A．the fallen tree | B．the forest |
| C．the bird | D．the picture |
| A．She's very outgoing. | B．She's good at observing. |
| C．She's very hard-working. | D．She shares interests with her sister. |
| A．Attention to accuracy. |
| B．Curiosity about the outside world. |
| C．Determination to find out the truth. |
| D．Ability to understand teachers' instructions. |
8 . Throughout the past few years, I have tried lo give myself to others. I have bounced around to find where I truly fit in, I found my place while I stayed in Guatemala, an orphanage (孤儿院) with the children living there. Through hearing many stories of their lives. I was moved to tears and started question my living ways and gave up everything that wasn’t essential: makeup and any other sort of luxury (奢侈品). I lived like they did. It was the most relaxing feeling in the world.
When at Nuestros Pequenos Hermanos, we were given the task of creating a pig pen(猪圈). At first, I thought it should be easy. After arriving at the area where the pig pen should he, we saw a hill. We were told to uproot the weeds as well as level the entire area. Looking at it we felt it would be impossible. On my own faith journey, I have felt this type of doubt before. The "hoe” , as we referred to, is a symbol of my faith journey. It appeared to be an obstacle I could not overcome, but in the end completed it with efforts. I feel this pig pen wasn’t easy to create but was so rewarding to give.
I've always struggled to be on a journey of faith, but I’ve never completely stepped foot onto the path until Guatemala. I’ve always tried to open my heart to everyone around me and give them my love, I feel as though I cut open my heart and share every bit of love I had with these orphans, There is one orphan named Ceto who will always remain very close to my heart, In Guatemala, I sponsor with thirty dollars a month, hat it doesn’t seem enough. I'll return there next summer and give more of my love for a whole month.
When it was time to leave. I looked out of the window and saw not just ordinary children. Over all, the most significant accomplishment I m in Guatemala was stepping towards my own faith journey and not looking back.
1. What resulted in the author ’s decision to live a new life?| A．Desire to help others | B．Decrease in his income |
| C．A knowledge of the orphans' life. | D．Awareness of the difficulty in his life |
| A．Removing the doubt | B．Uprooting the weed. |
| C．Starting the faith journey | D．Creating the pig pen |
| A．It was regretful | B．It was meaningful |
| C．It was interesting. | D．it was frightening |
| A．A Step into a New World | B．An Awful Faith Journey |
| C．A Great Success in Life | D．A Return of Confidence |
