1 . People tend to use trees for papermaking. But maybe electronics (电子) engineers are missing out on something here. “It turns out that two major building blocks of wood have a lot of electrical qualities,” says Magnus Berggren, a professor at Linköping University.
His team has been working to make parts for electronics from the forest. Right now, they’re focusing on two materials of trees. The first material is cellulose, which can make energy. Lignin, the second material, can store that energy, just as a battery does. The team has found when pressed, cellulose can produce electricity.
Some device must then store the electricity until it’s needed. Batteries can do this. But batteries aren’t very green. They have harmful materials. That’s where lignin comes in.
Batteries cause electrons to flow from one place to another, which can produce electricity. In a typical battery, one material must give electrons. The other must accept them. Lignin can do both. A weak acid (酸) encourages lignin to produce electrons. “With a metal wire (金属线) to guide those electrons, you’ll have electricity,” says Berggren.
Berggren’s team use this quality to create its new lignin-based battery. Typical batteries use a metal wire as a path to guide the flow of electrons into or out of the device. But since Berggren wants to make a battery of the forest, he looks for a natural way. Once again, he turns to cellulose.
This natural material can serve as a wire-like path for electrons. To make it work well, Berggren lines them with another chemical known as PEDOT, which isn’t from a tree. But when PEDOT is added to cellulose, they can conduct electricity like a wire. “With a weak acid, now you have a battery,” Berggren says. “And two of its three materials come from the forest.”
Berggren can imagine one day having mobile phone batteries made largely from forest products. Tree-based electronics might also be useful in lighting.
1. What is cellulose used to do in the study?| A．Act as a weak acid. | B．Collect rainwater. |
| C．Produce electricity. | D．Make quality paper. |
| A．Well-received. | B．Eco-friendly. | C．Harmful. | D．Heavy. |
| A．They may change farming practices. | B．They might save a lot of wood. |
| C．They would serve the elderly. | D．They could light the rooms. |
| A．A Green Way to Make and Store Energy | B．An Attempt to Raise Power Production |
| C．Practical Suggestions on Planting Trees | D．Recent Advances in Mobile Phones |
2 . Our two-year investigation into caged (关在笼中) tigers in America sent us through 32 US states—with some truly shocking experiences. But as the deadline neared, I still needed a powerful and hopeful image.
When we began our reporting in 2017—Sharon, writing; me taking photos; and our son, NickRuggia, filming—more tigers likely lived in cages in the US than remained in the wild. The number ranged from 5,000 to 10,000, but without strict government oversight, no one knew for sure.
Roadside zoos that allowed tourists to take pictures of young tigers were the main cause of what’s been called a US tiger crisis (危机). Caged cats often ended up in the illegal wildlife trade. Young tigers, parted from their mothers at birth, were fed poorly and touched by hundreds of people. When they grew too big and dangerous to pet at around 12 weeks, young tigers were put on show, or simply disappeared.
While we documented the unpleasant part of this industry, we also wanted to show the good life these impressive animals could have. With two weeks left before my deadline, I headed to the Wild Animal Sanctuary near Denver, where well-cared cats walked freely in their habitat.
There I met Clay, Daniel, and Enzo, three of 39 tigers rescued from an animal park in Oklahoma. These nearly grown cats raced beside our car, which I’d seen only in the wild. It was a hot July day and soon two of the cats jumped into a pool to cool off. The third rested beside them on the ground. I crossed the road to take a picture of them. Then quietly, I came up close, trying not to disturb (打扰) them. I had the shot.
1. Why did the author start her reporting?| A．To dig out the dark truth of caged tigers. | B．To explore the amazing land in the country. |
| C．To tell people that baby tigers are harmless. | D．To share the happy moment during the trip. |
| A．Forest fires. | B．Climate change. | C．Roadside zoos. | D．Water pollution. |
| A．They prefer to stay indoors. | B．They are badly treated. |
| C．They get used to the changes. | D．They are traded legally. |
| A．To praise her family for their effort. | B．To explain what the animals suffered. |
| C．To introduce a special kind of tigers. | D．To show some tigers lead an easy life. |
3 . Leah Brown aged 36 fell several hundred feet from Oregon’s highest mountain right before the eyes of a group of volunteer rescue workers who rushed to her aid and helped save her life.
The woman was coming down a popular path (小路) on Mt. Hood, about 70 miles east of Portland, on Saturday morning, according to the local police. Mt. Hood is the highest in Oregon, standing at around11.240 feet.
The fall was seen by members of Portland Mountain Rescue (PMR), a volunteer organization focused on helping people in mountainous areas. The group called 911 and rushed to the woman, providing medical care. They helped keep the woman warm for seven hours as the police worked to get her off the mountain safely. Finally, the woman was evacuated (转移) to a parking lot at 9:30 pm and taken to a hospital.
The climber, Leah Brown, said she didn’t know what caused her fall. “I can only guess it was either an ice tool or a crampon (冰爪) that didn’t land and stick like it should have, so I became detached from the mountain,” Brown said. “The thing I’d like to most stress is my appreciation for the members of PMR who evacuated me and took good care of me the whole time,” Brown added. “They saved my life. ”
In a statement after the rescue, PMR warned of the dangerous winter conditions at the mountain. “The short days and lower temperatures mean that the snow tends to be very hard and icy, and the conditions tend to be much steeper. Climbing the mountain in icy conditions is much more difficult,” the group said.
1. What happened to Brown on Saturday morning?| A．She lost her way in a forest. | B．She hurt her eye unexpectedly. |
| C．She failed to call her family. | D．She fell down on a downhill path. |
| A．Different. | B．Hidden. | C．Separated. | D．Tired. |
| A．Thankful. | B．Regretful. | C．Surprised. | D．Concerned. |
| A．Climbing requires teamwork. | B．Climbing in winter is too risky. |
| C．We must remain positive in hard times. | D．We can admire the view on sunny days. |
4 . While doing homework, Seoyoung Jun closed one eye and successfully picked up her pencil holder. She realized that directing herself in a 3D space didn’t require both eyes. This surprised her so much that she did some research. And she learned the brain can process 3D information with poor vision (视力) or even without any vision. Then the idea for Mind Beacon was born.
It uses a thin line of light to gather 3D information about the placement of walls, furniture and other things. Then the light sends that information back to Mind Beacon,which then raises little pins (大头针) to show where those obstacles (障碍物) are. Then blind people can “read” the position of those pins to understand the positions of structures and objects ahead and walk around them.
When the invention worked for the first time, Seoyoung didn’t believe it. She’d been up all night working on it. To be sure there wasn’t a mistake, she shut it off and started it up. It had been seven long months of research and testing. Now this tool can help disabled people create a mental image of their surroundings.
The heart of Mind Beacon is a 3D depth sensor that’s connected to a computer. That computer can control motors that are lined up in three rows of three. Each motor controls a pin that can move up and down. When the sensor finds an obstacle, the pin rises. It can rise to three different heights. Each height roughly represents the height of the obstacle. Someone who runs their hand over the nine pins can tell where the obstacle is and its general height.
Mind Beacon won Seoyoung a place at the world’s high school research competition, Right now, she wants to ameliorate it. She imagines in the future it can be connected to a smartphone, with more little pins to show the exact height of the obstacle. It would feel like a little map showing the location and size of the obstacle ahead.
1. What inspired Seoyoung to invent Mind Beacon?| A．The desire to win a competition. | B．The blind’s good sense of touch. |
| C．Her wish to bring convenience to the disabled. | D．Her ability to locate an object without full vision. |
| A．By informing them of the obstacles in advance. |
| B．By teaching them to describe dangerous objects. |
| C．By making them have easy access to the Internet. |
| D．By training them to remember maps of their living areas. |
| A．The limitations of Mind Beacon pins. | B．The working process of Mind Beacon. |
| C．The role of computers in Mind Beacon. | D．The effect of Mind Beacon on the blind. |
| A．Keep. | B．Spread | C．Improve. | D．Control. |
5 . Student newspapers across the US are facing a dark reality. As they are free to read, they are making less money than ever, meaning that such newspapers are finding it hard to survive.
Most college papers have reduced their print editions (版本). Last year, the Daily Tar Heel printed a paper four days a week. This year, it prints a paper every three days. And while it used to produce around 22,000 newspapers each time, it only makes around: 10,000 now, said Erica Perel, general manager.
Increasingly, student journalists have turned their focus to digital versions of their newspapers, and the new ways that social media allows them to tell stories. They’ve adapted their skills to mirror what’s going on in the professional journalism world.
“I think we’re adapting very well…in moving away from that print edition. But it’s challenging.” said Jonathan Carter, a student at North Carolina State University. So what should student newspapers do? LoMonte said the best solution would be for universities to financially (财经的) support student journalism. University leaders like to talk about producing responsible students, he said, and journalism is a part of that.
In the meantime, campus newspapers are figuring out their financial models as they go along. Bruce dePyssler, adviser to North Carolina Central University’s Campus Echo Newspaper, said his students post one story a day online. The best stories are put together for a once-a-semester print edition.
And even if student journalists don’t go into media jobs, Perel said, “They’ve still had a great education.” “The number one thing that we teach is critical thinking (批判思考) and how to be a lifelong learner, ” she said, “The ones who are living through this transition (过渡) are the ones that are going to be a lot stronger for it in the end.”
1. What do most college newspapers do to face the dark reality?| A．Improve printing quality. | B．Reduce print editions. |
| C．Lower advertising fees. | D．Increase paper price. |
| A．Ask colleges for money. | B．Continue with paper versions. |
| C．Publish more digital editions. | D．Create their own financial models. |
| A．Jonathan Carter. | B．LoMonte. |
| C．Bruce dePyssler. | D．Perel. |
| A．The proud history of the Daily Tar Heel. | B．Student newspapers are adapting well. |
| C．School newspapers are under pressure. | D．How to refresh traditional newspapers. |
6 . Endangered polar bears are breeding (繁殖) with grizzly bears (灰熊), creating “pizzly” bears, which is being driven by climate change, scientists say.
As the world warms and Arctic sea ice thins, starving polar bears are being forced ever further south, where they meet grizzlies, whose ranges are expanding northwards. And with that growing contact between the two come increasing hybrids (杂交种).
With characteristics that could give the hybrids an advantage in warming northern habitats, some scientists guess that they could be here to stay. “Usually, hybrids aren’t better suited to their environments than their parents, but these hybrids are able to search for a broader range of food sources,” Larisa DeSantis, an associate professor of biological sciences at Vanderbilt University, told Live Science.
The rise of “pizzly” bears appears with polar bears’ decline: their numbers are estimated to decrease by more than 30% in the next 30 years. This sudden fall is linked partly to “pizzly” bears taking up polar bears’ ranges, where they outcompete them, but also to polar bears’ highly specialized diets.
“Polar bears mainly consumed soft foods even during the Medieval Warm Period, a previous period of rapid warming,” DeSantis said, referring to fat meals such as seals. “Although all of these starving polar bears are trying to find alternative food sources, like seabird eggs, it could be a tipping point for their survival.” Actually, the calories they gain from these sources do not balance out those they burn from searching for them. This could result in a habitat ready for the hybrids to move in and take over, leading to a loss in biodiversity if polar bears are replaced.
“We’re having massive impacts with climate change on species,” DeSantis said. “The polar bear is telling us how bad things are. In some sense, “pizzly” bears could be a sad but necessary compromise given current warming trends.”
1. Why do polar bears move further south?| A．To create hybrids. | B．To expand territory. |
| C．To relieve hunger. | D．To contact grizzlies. |
| A．Broader habitats. | B．More food options. |
| C．Climate preference. | D．Improved breeding ability. |
| A．A rare chance. | B．A critical stage. |
| C．A positive factor. | D．A constant change. |
| A．Polar bears are changing diets for climate change. |
| B．Polar bears have already adjusted to climate change. |
| C．“Pizzly” bears are on the rise because of global warming. |
| D．“Pizzly”bears have replaced polar bears for global warming. |
7 . What makes people so special? Tool use, self-consciousness, language, and culture are high on the list, but in fact all of these characteristics can be found elsewhere in the animal kingdom. Humans and apes are close relatives, so it is perhaps not surprising that chimpanzees use tools or that gorillas (大猩猩) have a sense of fair play, even rejecting carrots (which they normally accept) when they see their neighbors getting grapes. But the qualities that we often think of as uniquely human exist not just on land, but in the ocean as well.
Among the invertebrates, octopuses (八爪鱼) are known for their intelligence, even exhibiting evidence of playfulness, tool use, and personality. But these skilled predators live alone and consequently lack culture. Dolphins, on the other hand, are large-brained, long-living, social- group-based predators, and it is here that we find the greatest similarity to human-like culture and awareness.
Culture depends on the ability of animals to pass on things they have learned to others. Many animals have culture in this sense, but what sets dolphins apart is what they pass on. Some bottlenose dolphins hold sponges in their mouths that they use as tools to sweep for fish hiding on the ocean floor. This ability is handed down through generations (especially in females), with some families — grandmother, mother, and daughter — all feeding in this highly specialized way.
Another characteristic that dolphins share with humans is their ability to recognize themselves in a mirror. When facing a mirror, most animals behave as though they are interacting with another individual. Even in humans, the ability to recognize that the image in a mirror is oneself does not occur before the age of 18 months. Dolphins not only recognize themselves, but if a black mark is put on the body of a dolphin, it will spend extra time at the mirror to look at the mark.
1. The example of gorillas rejecting carrots shows they ________.| A．are not easy to fool | B．prefer fruit to vegetables |
| C．have a special taste for food | D．have an awareness of equality |
| A．Cooperation. | B．Intelligence. |
| C．Tool using ability. | D．Fun-loving spirits. |
| A．They tend to hunt in groups. |
| B．Their hunting skills are passed down. |
| C．Their learning environment is favourable. |
| D．Their families are typically female-controlled. |
| A．Dolphins enjoy looking at their own reflection in the mirror. |
| B．Dolphins are as intelligent as a typical 18-month-old human baby. |
| C．Dolphins are generally regarded as the most advanced non-human species. |
| D．Dolphins’ ability to recognize their own reflection is a higher-order mental skill. |
8 . My dad is easy-going and has a gift for chatting. He
One Saturday, we went
Dad said, “Hi, how are you today? This is my son. I have a restaurant, and we
Back in the car, Dad said to me, “The cashier was obviously
| A．owns | B．describes | C．visits | D．recommends |
| A．supermarket | B．hospital | C．restaurant | D．company |
| A．hiking | B．camping | C．exploring | D．shopping |
| A．imagined | B．believed | C．noticed | D．remembered |
| A．beautiful | B．unhappy | C．professional | D．polite |
| A．received | B．needed | C．avoided | D．offered |
| A．suitable | B．frightening | C．special | D．friendly |
| A．helped | B．refused | C．waited | D．forgot |
| A．problem | B．idea | C．hope | D．experience |
| A．talking to | B．looking after | C．going after | D．laughing at |
| A．work | B．play | C．tour | D．exercise |
| A．drive | B．tie | C．treat | D．lead |
| A．quitted | B．finished | C．missed | D．regretted |
| A．in peace | B．in danger | C．in a hurry | D．in low spirits |
| A．warmly | B．immediately | C．secretly | D．comfortably |
9 . Animals, including humans, feel sound as well as hear it, and some of the most meaningful communication happens at frequencies (频率) that people can’t hear. Elephants, for example, use these low-frequency sounds to, among other things, find family or a mate across long distances. Whales do it, too.
But you don’t have to weigh a ton to make a sound. In fact, you don’t have to be bigger than a pea. Consider, for example, the tree-hopper, a curious little animal that lives on the stems (茎) of the leaves. University of Missouri biologist Rex Cocroft has spent much of his time listening closely to tree-hoppers with his team.
The team discovers that all the sounds being heard from tree-hoppers are produced by males. They do it by vibrating (振动) their abdomens (腹部) to make a wide variety of strange sounds. There is almost no airborne sound produced with these vibrational sounds. Cocroft explained, “If a tree-hopper were to stand on your finger and produce a sound, you would feel the vibration but hear no sound.”
They showed that some sounds, not surprisingly, seem to be aimed at attracting females. And some are aimed at other males.
Cocroft explained, “When two males meet each other, or when they are mate-searching on a branch, we’re hearing ‘purring, bdddddrrrr…’ sounds that males give.” Normally, a person couldn’t hear any of this, because the sound travels along the stem, inside it. And that’s how other tree-hoppers detect it.
Cocroft said tree-hoppers have very sensitive legs. And they stand around on stems, which are good at spreading vibrations. So they just use what nature gives them to communicate with each other.
“They have so many different forms of social behavior and grouping,” Cocroft explained. “And once there are animals living in groups, then there will be all sorts of interesting possibilities for communication.”
1. What does Cocroft’s research focus on about tree-hoppers?| A．Their variety. | B．Their communication. |
| C．Their living areas. | D．Their numbers. |
| A．They sense sounds by legs. |
| B．They knock the stems to make sounds. |
| C．Their sounds can be easily heard by humans. |
| D．Females make sounds to meet each other |
| A．It is key to their survival. |
| B．It drives an increase in their numbers. |
| C．It often leads to communication. |
| D．It contributes much to the division of animal types. |
| A．A Magic Moment in Nature | B．A Journey to the Wildlife |
| C．Learning From Nature | D．Communication Sounds Among Animals |
10 . Every year the start of the Atlantic hurricane season is another reminder for Margarite August that she still doesn’t have a roof.
The 70-year-old retired teacher’s home on the small Caribbean island nation of Dominica was mostly wiped out by hurricane Maria six years ago.
Six years after hurricane Maria, Dominicans like Margarite August still haven’t been able to rehabilitate their homes.
August is not alone. Since Maria, the government of Dominica has built 7,000 new homes—about a quarter of its housing stock-with materials to fight another Category 5 hurricane. They’ve also relocated two communities. But an untold number of the island’s 70,000 or so residents are like August, rebuilding their homes in any way they can afford.
Hurricane Maria is often referred to as a once-in-a-lifetime disaster. Scientists put much of the blame on warming ocean temperatures that could make frequent (频繁的) storms like it.
Maria damaged a terrible 95% of Dominica’s housing stock and 226% of the nation’s GDP. Before the storm, the country’s economy had long struggled since its independence from Great Britain in 1978. Unlike its more famous touristy neighbors along the chain of eastern Caribbean islands it lies on, Dominica is more known for its rugged mountains and jungles (丛林) than white sandy beaches.
The jungle mountains that crash down to the coast are beautiful but disasters visit easily. “I don’t think anybody ever got over Maria,” says Christine John of the Dominica Red Cross. “There are a lot of persons today—if it just starts to rain outside, they get anxious.”
1. What does the underlined word “rehabilitate” in paragraph 3 mean?| A．Rebuild. | B．Leave. | C．Decorate. | D．Buy. |
| A．Over-farming. | B．Loss of the land. |
| C．The disappearance of the forests. | D．Climate change. |
| A．Its good economy. | B．Its architecture. |
| C．Its mountains and jungles. | D．Its sandy beaches. |
| A．They have to stay bored at home. | B．Their houses are easy to take in water. |
| C．They don’t know how to make umbrellas. | D．They are afraid of another disaster like Maria. |
