1 . In the endless sky, the unaided human eye should be able to perceive several thousand stars on a clear, dark night. Unfortunately, growing light pollution has impeded people from the nightly view.
New citizen-science-based research throws alarming light on the problem of “sky glow”-the diffuse illumination (漫射照明) of the night sky that is a form of light pollution. The data came from crowd-sourced observations collected from around the world as part of Globe at Night, a program developed by astronomer Connie Walker.
Light pollution has harmful effects on the practice of astronomy but also on human health and wildlife, since it disturbs the cycle from sunlight to starlight that biological systems have evolved alongside. Furthermore, the loss of visible stars is a great loss of human cultural heritage. Until relatively recently, humans throughout history had an impressive view of the starry night sky, and the effect of this nighty spectacle (壮观) is evident in ancient cultures.
Globe at Night has been gathering data on star visibility since 2006. Anyone can submit observations through the Globe at Night web application. Participants record which one best matches what they can see in the sky without any telescopes or other instruments.
Researchers find that the loss of visible stars indicates an increase in sky brightness of 9.6% per year while roughly 2% is measured by satellites. Existing satellites are not well suited to measuring sky glow as it appears to humans, because they can not detect wavelengths shorter than 500 nanometers (纳米). White LEDs, with shorter wavelengths under 500 nanometers, now are increasingly commonly used in outdoor lighting. But human eyes are more sensitive to these shorter wavelengths at nighttime. Space-based instruments do not measure light from windows, either. But these sources are significant contributors to sky glow us seen from the ground.
“The increase in sky glow over the past decade underlines the importance of redoubling our efforts and developing new strategies to protect dark skies,” said Walker. “The Globe at Night dataset is necessary in our ongoing evaluation of changes in sky glow, and we encourage whoever can to get involved to help protect the starry night sky.”
1. What does the underlined word “impeded” in the first paragraph mean?| A．separated. | B．disabled. | C．demanded. | D．protected. |
| A．Poorer human health. | B．Fewer wildlife species. |
| C．More delicate biological systems. | D．Less nightly culture elements of the sky. |
| A．Crowd sourced data are invaluable | B．Shorter wavelengths are hard to detect. |
| C．Satellites play a vital role. | D．White LEDs are widely used. |
| A．Their consistent efforts pay off. | B．The dataset needs to be updated. |
| C．The sky glow has been over-emphasized. | D．More participants are expected to join in. |
2 . Many news reports focus on climate change these days. Extreme heat, wildfires, floods, homeless polar bears... How do you feel when reading worrying news about climate change? You may believe that people are becoming insensitive to the warming planet, accepting that it is only getting worse.
A research team at Pennsylvania State University, US, reported otherwise. To record how the news can impact people’s emotions, participants were first exposed to negative news stories about climate change for three days. They then continued to read negative news headlines for seven days. In the first three days, the participants experienced greater fear and less hope, which can potentially hurt an audience’s belief that they can do anything to tackle the problem.
However, during the seven-day-long exposure, the fear peaked and then held steady (稳定的). “We saw the opposite pattern in our second study. The more exposure people had to these threatening news stories each day, the more likely they are to think that they can make a difference in tackling climate change,” Christofer Skurka, the paper’s lead author told the Pennsylvania State University website.
According to the researchers, one possibility is that when the public hears about climate change threats, they may convince themselves that they have control over the situation. They will then believe that their actions may make a difference.
Knowing that everyone is able to help is only the first step. According to a study that analyzed information from 430 different studies, what motivates people the most to change their behavior is social comparison. For example, if a person’s neighbors follow a low-carbon lifestyle, such as driving electric cars, the person may feel social pressure and become more likely to follow this behavior. This happens because people usually judge their own behavior and follow social norms (规范). Another effective motivation is providing financial rewards to consumers, helping them save money.
“There are so many routes to our goals,” Matthew Goldberg, the co-author of the study, told Scientific American. As Goldberg pointed out, future research like this can help policymakers decide how best to encourage people to ward more climate-friendly habits.
1. How did the participants react to negative news in the second study?| A．They found the news unbelievable. |
| B．They lost hope in tackling climate change. |
| C．They experienced greater fear for the future. |
| D．They felt a strong sense of social responsibility. |
| A．Effective policy. | B．Healthy lifestyle. |
| C．Social influence. | D．Financial support. |
| A．Responses to climate change education. |
| B．T he effectiveness of community initiatives. |
| C．T he impact of social norms on environment. |
| D．Ways to encourage climate-friendly behavior. |
| A．Doubtful. | B．Optimistic. | C．Objective. | D．Indifferent. |
3 . On Christmas Eve, a team of reindeer (驯鹿) will help Santa Claus deliver gifts to children all around the world. The reindeer, led by their fearless leader Rudolph, won’t be the only ones doing something special. Back in the highest Arctic, their cousins have a remarkable ability changing their eye color.
During the summer months, when the days are long and the sun is bright, reindeer’s tapetum lucidum (荧光膜), a mirror-like layer at the back of their eye, appears golden, which helps bounce the majority of light off the eyes, effectively acting like a pair of natural sunglasses. As winter comes, and the days become shorter and darker, the tapetum lucidum turns blue to absorb more light, allowing reindeer to improve their night vision and see clear in low light conditions.
With these adaptations, reindeer can adapt and thrive in one of the harshest environments on Earth. Unlike humans, reindeer can see well into the shorter Ultra Violet (UV) range. This UV vision enables them to spot food and predators more effectively in the snowy landscape. Lichens, a key part of their winter diet, absorb UV, so they show up dark against UV-reflecting white snow. Wolf and polar bear fur also absorb UV, so instead of disappearing against snow they pop out in high contrast, allowing reindeer to spot potential threats from a distance.
Reindeer change their eyes by adjusting their tapetum lucidum, which is made of collagen fibers. In winter, the collagen fibers become packed tighter, causing the tapetum lucidum to mainly reflect blue light. This change happens when reindeer dilate their pupils (瞳孔). In summer, the reindeer’s pupils return to a smaller size, which helps reindeer reduce the amount of light entering the eye.
But their unique adaptation may hurt them. Today, the increasing use of artificial lighting, especially during the winter months, poses a potential threat to their sensitive eyes. It can make reindeer lose their way, affecting their ability to survive in their challenging environment. So it is crucial for us to be mindful of our use of electricity and make efforts to minimize light pollution to ensure the well-being and survival of these magnificent creatures.
1. What do we know from paragraph 2?| A．The shape of reindeer’s eyes varies with seasons. |
| B．It is difficult for reindeer to live in low light conditions. |
| C．The tapetum lucidum helps reindeer adapt to seasonal changes. |
| D．Reindeer’s eyes appear golden in winter while blue in summer. |
| A．To help them see clear in dark nights. |
| B．To distinguish food of different colors quickly. |
| C．To protect their eyes from harsh sunlight in summer. |
| D．To better locate food and enemies during snowy days. |
| A．Relax. | B．Expand. | C．Narrow. | D．Hide. |
| A．To call on people to protect reindeer from light pollution. |
| B．To show the reasons for the decline in reindeer population. |
| C．To present humans’ great efforts to reduce artificial lighting. |
| D．To prove reindeer’s strong adaptability to harsh environments. |
4 . The world’s oceans will likely lose about one-sixth of their fish and other creatures within 100 years if climate change continues on its current path. Every degree Celsius that the world’s oceans warm, their biomass is expected to drop five percent, a study found.
The study predicts that if there is no change in the rate of worldwide greenhouse gas production, there will be a 17-percent loss of biomass by the year 2100. But, if the world reduces carbon pollution, biomass losses could be limited to only about 5 percent.
Warming temperatures are the biggest issue. But climate change also produces oceans that are more acidic and have less oxygen. This also harms sea life. Much of the world depends on the oceans for food or work.
The findings make sense and the possible effects of the predicted losses of animal life are huge. “Climate change has the potential to cause serious new conflicts over ocean resource use as the human population continues to grow,” said scientists.
Marine biologist Boris Worm, who helped run the study, added that the “building blocks of marine life—plankton and bacteria—may decline less heavily.”
“Those marine animals that we use directly, and care about most deeply, are predicted to suffer the most,” said Worm. He works at Canada’s Dalhousie University.
Scientists had already believed climate change would likely reduce future ocean life. But past computer-based studies looked at only part of the picture or used only one model. The latest study used six different computer models to give the best picture look yet, William Cheung said.
University of Georgia marine biologist Samantha Joye was not part of the research. But she praised the study as well researched and extremely detailed, and called it “an urgent call for action”.
1. What does the underlined word “biomass” in paragraph 1 refer to?| A．Ocean temperature. | B．Total marine life. |
| C．Sea condition. | D．Ocean level. |
| A．It may reduce the sea resource. | B．It leads to the extinction of marine life. |
| C．It pollutes the environment of the ocean. | D．It may increase the world population. |
| A．The largest ones. | B．The ones in deep oceans. |
| C．The bacteria on sea surface. | D．Those we humans need most. |
5 . Around the world, people are realizing the significant problems caused by plastic waste. In the last 65 years, we have become increasingly dependent on plastic. It’s easy to understand why: it’s cheap to produce, light — therefore easy and cheap to transport — and incredibly strong and durable.
One popular solution to the problem is to prohibit single use plastics. In the British supermarkets, shoppers are encouraged to make more environmentally-friendly choices in packing and transporting their food.
However, such plans may not be beneficial to eliminate (消除) the use of single-use plastic altogether.
Another issue is that alternative materials to plastic are often more environmentally harmful than plastic. Take paper bags, for example.
Clearly there is a need to reduce plastic waste and its impact on the environment.
| A．But it’s these advantages that also make it so harmful. |
| B．They are very fragile and rarely reusable, unlike plastic. |
| C．One of the fields where single-use plastic has a vital role is medicine. |
| D．However, simply banning their single use may not be the best option. |
| E．It also boosts the local economy and save costs in managing littering and waste. |
| F．Bans on single-use plastic items like drinking straws are also coming into place. |
| G．According to a research, they require four times more energy when produced than a plastic bag. |
