1 . People often recommend planting trees to make cities greener, cleaner and healthier. But during heat waves, city trees can actually increase air pollution. Indeed, a new study has found, up to 60 percent of the smoggy ozone in a city’s air on hot days may trace to chemicals emitted by trees. Galina Churkina, who works at Humboldt University of Berlin, and her team have confirmed it.
The findings might seem the opposite of what you would expect, notes Robert Young, an expert in city planting at the University of Texas at Austin. Indeed, he says, “Everything has multiple effects.” The new findings do not mean cities should discourage tree planting. Instead, cities may need stricter controls on other sources of pollution, such as tailpipeemissions from cars and trucks.
City trees soak up carbon dioxide, and at the same time they release oxygen into the air. But oxygen is far from the only gas that trees and certain other green plants release into the air. One of these chemicals is a hydrocarbon known as isoprene(异戊二烯). It can react with combustion(燃烧)pollutants, such as nitrogen oxides(氮氧化物)emitted by cars and trucks in cities. The result is the formation of ozone, a component of smog, which can irritate the lungs and cause airway diseases.
Churkina says her team is not surprised to see the seemingly contrary relationship between plants and pollution. She adds that its importance is quite amazing. “The results,” Churkina says, “suggest that city tree planting programs should not ignore the role this greenery may play in aggravating summer air pollution.” “Adding more trees will improve quality of life only if those cities also undertake plans to sharply cut vehicle pollution in summer and to increase their reliance on clean energy sources for electric power,” she says.
1. What does the new study find about city trees on hot days?| A．City trees can reduce the smoggy ozone. |
| B．City trees may easily absorb heat waves. |
| C．City trees may cause more air pollution. |
| D．More city trees can make a city far better. |
| A．The harm ozone does to people in cities. |
| B．The way trees help the formation of ozone. |
| C．The chemicals green plants release into the air. |
| D．The benefits trees bring to the city environment. |
| A．Worsening. | B．Decreasing. | C．Improving. | D．Releasing. |
| A．Planting more trees in cities. |
| B．Advocating using clean energy. |
| C．Improving people’s quality of life. |
| D．Banning vehicle pollution in summer. |
2 . Natural selection is the process by which one type of animal within a species grows or develops well because of certain features that make it more likely(可能的) to live than others in its group. The history of the peppered moth (灰蛾) is an example of the natural selection process.
In nineteenth-century England, certain types of peppered moths were able to better blend (融合) into their surroundings. During that time period, great changes were happening in Great Britain. The Industrial Revolution was part of this change, and with it came air pollution. Natural selection often takes hundreds or even thousands of years to happen. For the peppered moth, this process happened comparatively(相对地) quickly.
At the beginning of the Industrial Age, most peppered moths in England were light-colored and covered with black markings, although a few moths had dark-colored wings. Because the light-colored moths blended into the light-colored bark on the trees, they could not be easily seen by birds that would eat them. As the air grew more polluted, however, tree trunks became covered with soot (煤烟) and became darker. The light-colored moths became easy for birds to see against the dark tree trunks. Since the dark-colored moths now had the advantage, their numbers grew. Within 50 years, the peppered moth went from being mostly light-colored to being mostly dark-colored.
In the twentieth century, the air cleared up, and the peppered moth population changed again. As tree trunks lightened because of less soot in the air, light-colored moths once again had an advantage. Their numbers increased as soot levels dropped. Depending on their environment, the coloration of the moths helped them to be “naturally selected” to survive(生存).
1. What do we know about the peppered moth’s natural selection process?| A．It was a good example of environmental protection. |
| B．The soot levels in England did not affect it. |
| C．This type of color change was typical for moths. |
| D．The length of time was unusual. |
| A．Both kinds of moths preferred the dark-colored trees. |
| B．Birds failed to see light-colored moths. |
| C．There were more light-colored moths than dark-colored moths in the beginning. |
| D．The color of moths was unimportant. |
| A．Birds would eat fewer moths. |
| B．Light-colored moths would disturb people’s life. |
| C．Moths would not be able to stay alive. |
| D．The population of dark-colored moths would increase. |
| A．the surrounding environment may affect some peppered moths’ survival |
| B．birds preferred to eat dark-colored moths than to light-colored ones |
| C．different types of peppered moths liked different kinds of tree trunk |
| D．birds were dangerously affected by the soot levels |
3 . There is an “environmental silver lining” as a result of the corona virus (冠状病毒) —carbon emissions have been reduced by more than 4%, many wildlife markets around the world have been closed and air quality in some places has slightly improved, Dave Ford, founder of the environmental literacy organization Soul Buffalo, says.
However, because of an increase in pandemic-related, non-recyclable materials such as take-out plastic containers and masks, 30% more waste has entered our oceans, he notes. “There's 129 billion facemasks being made every month—enough that you could cover the entire country of Switzerland with facemasks at the end of this year if trends continue,” he says. “And a lot of these masks are ending up in the water.” The masks look like jellyfish—in other words, food—to turtles and other wildlife creatures, thus, attractive to those animals and then endangering them, he says.
Very little of the plastic we use is actually recyclable. Sharon Lerner of The Intercept told Here & Now last year that "the vast majority of plastic that has ever been produced—79%—has actually ended up in landfills or burned, but not remade into new products." Even if the plastics we have can be reused, Ford says recycling programs across the globe are facing severe budget cuts.
“We're starting to see recycling programs stopped, waste picking communities operating at 50% or actually shutting down. They are the last line of defense between plastic and the environment,” he says.
Last year, Unilever planned to cut its use of non-recycled plastics in half by 2025. In an interview with Here & Now, Richard Slater, Unilever's chief research and development officer, drew on the industry argument that plastic packaging is lighter, which means less shipping and therefore fewer dangerous emissions that cause climate change.
Yes, plastics are lightweight and can cut down on fuel spending. But on the other hand, plastic waste is being found in every aspect of life—even in the deepest ocean.
1. What does “environmental silver lining” in Paragraph 1 refer to?| A．An environmental organization. |
| B．The closure of some wildlife markets. |
| C．Benefits on environment from the corona virus. |
| D．The decrease of carbon dioxide emissions. |
| A．There is a continuous shortage of food in the ocean. |
| B．They contain certain unique chemicals. |
| C．Many sea creatures like to chase plastic by nature. |
| D．They look like the sea creatures' food. |
| A．The majority of it is buried or burned. |
| B．Most of it is recycled into new products. |
| C．129 billion facemasks end up in the ocean. |
| D．There is enough budget for plastic recycling. |
| A．Plastic can cut down fuel spending |
| B．The corona virus has caused more ocean plastic |
| C．Recycling programs are shutting down |
| D．Solutions to ocean plastic pollution are being explored |
Air pollution is no doubt a major concern in many big cities across the world. More than 80% of people living in urban areas
“Urban air pollution continues to rise at
In the past two years, the number of cities monitoring air pollution
The report also showed that low-and middle income countries
5 . Hardware in general,and smartphones in particular,have become a huge environmental and health problem in the Global South's landfill sites(垃圾填埋场).
Electronic waste(e-waste) currently takes up 5 percent of all global waste,and it is set to increase rapidly as more of us own more than one smartphone,laptop and power bank They end up in places like Agbogbloshie on the outskirts of Ghana's capital,Accra. It is the biggest e-waste dump in the world,where 10,000 informal workers walk through tons of abandoned goods as part of an informal recycling process.They risk their health searching for the precious metals that are found in abandoned smartphones.
But Agbogbloshie should not exist.The Basel Convention,a 1989 treaty,aims to prevent developed nations from unauthorized dumping of e-waste in less developed countries.The e-waste industry,however,circumvents regulations by exporting e-waste labelled as "secondhand goods' to poor countries like Ghana,knowing full well hat it is heading for a landfill site.
A recent report found Agbogbloshie contained some of the most dangerous chemicals.This is not surprising: smartphones contain chemicals like mercury（水银）,lead and even arsenic(砷).Reportedly, one egg from a free-range chicken in Agbogbloshie contained a certain
chemical which can cause cancer and damage the immune system at a level that's about 220 times greater than a limit set by the European Food Safety Authority(EFSA).Most worryingly,these poisonous chemicals are free to pollute the broader soil and water system.This should concern us all, since some of Ghana's top exports are cocoa and nuts.
Some governments have started to take responsibility for their consumers' waste.For example,Germany has started a project that includes a sustainable recycling system at Agbogbloshie,along with a health clinic for workers.However,governments cannot solve the problem alone, as there is an almost limitless consumer demand for hardware,especially when governments' green policies are focused on issues like climate change.
Only the manufacturers can fix this.A more economically sustainable and politically possible solution is through encouraging hardware manufacturers to make the repair, reuse and recycling of hardware profitable,or at least cost-neutral
1. What can we infer from Paragraph 2?| A．Electronic waste requires more landfill sites across Ghana. |
| B．Electronic waste is too complex to get fully recycle |
| C．Electronic products need to be improved urgently |
| D．Electronic pollution is a burning question in Agbogbloshie |
| A．Abolishes | B．Tightens |
| C．Brings in | D．Gets around |
| A．The thread of polluted food around the world |
| B．The damage of chicken’s immune system |
| C．The lack of diversity in Ghana's exports |
| D．The violation of EFSA's standards |
| A．Manufacturers' developing a sustainable hardware economy |
| B．Governments’ adjusting their green policies about e-waste. |
| C．Reducing customers' demands for electronic products |
| D．Manufacturers’ urging the government to make effective policies to ensure more profit. |
6 . Rain is vital to life on Earth. However, rain isn’t just made of water anymore—it’s partly made of plastic.
Millions of tiny pieces of plastic, called microplastics, are wandering around Earth’s atmosphere and traveling across entire continents, according to a study published in the journal Proceedings of the National Academy of Sciences on April 12. Another study, published in the journal Science in June 2020, has revealed that every year more than 1,000 tons of the particles (颗粒)—equivalent to over 120 million plastic bottles—fall in rain.
Microplastics are plastic particles less than 5 millimeters in diameter (直径) and come from a number of sources. Plastic bags and bottles released into the environment break down into smaller and smaller bits. Some microplastics are manufactured deliberately to provide abrasion (研磨) in a host of products, such as toothpaste and cleansers, according to the Daily Mail. Another major source is your washing machine. When you wash synthetic (合成的) clothing, tiny microfibers get flushed (冲掉) away with the wastewater. Even though the water is treated by a wastewater plant, the microplastics remain, and they are released into the sea, according to American magazine Wired.
Plastic rain may remind people of acid rain, but the former is far more widespread and harder to deal with. The tiny particles, too small to be seen with the naked eye, are collected by the wind from the ground. They are so light that they stay in the air to be blown around the globe. As they climb into the atmosphere, they are thought to act as nuclei (核心) around which water vapor (水蒸气) condenses (凝结) to form clouds. Some of the dust falls back to land in dry conditions, while the rest comes down as rain, according to the Daily Mail.
Microplastics have been found everywhere you can imagine. From fish and frogs to mice and mosquitoes, their bodies have been found, on average, to contain 40 pieces of microplastic, reported Daily Mail. As the top of the food chain, humans are exposed to microplastics, too. “We live on a ball inside a bubble,” microplastic researcher Steve Allen at University of Strathclyde, Scotland, told Wired. “There are no borders, there are no edges. It (plastic rain) raining on the land and then getting blown back up into the air again, to move somewhere else. There’s no stopping it once it’s out.”
1. What does paragraph 3 mainly talk about?| A．How microplastics should be handled. | B．How microplastics are used widely. |
| C．How microplastics pollute water. | D．How microplastics come into being. |
| A．They are light and can be easily dealt with. |
| B．They result in both acid rain and plastic rain. |
| C．They have a diameter of at least 5 millimeters. |
| D．They have nearly affected the whole food chain. |
| A．No place is safe from microplastic pollution. |
| B．The atmosphere possesses the capacity to self-cleanse. |
| C．Countries should work together to fight plastic pollution. |
| D．It is important to remove microplastics somewhere else. |
| A．To compare acid rain and plastic rain. |
| B．To warn people of the dangers of microplastics. |
| C．To call on people to reduce using plastic products. |
| D．To introduce the sources and effects of microplastics. |
7 . Air pollution may be causing baldness, scientists have shown for the first time. A new study found that fine particulate matter emitted by cars would damage the skin that holds hair follicles in place. A series of laboratory tests on human cells showed that levels of the crucial proteins needed for hair to grow and be retained decreased when they were exposed to pollution particles. While there is a growing body of evidence showing how these tiny particles can damage internal health, including by entering the bloodstream through the lungs, this is the first to demonstrate such a risk to the surface of the body.
The study was conducted by exposing cells from the human follicle dermal papilla cells (HFDPCs) ,to various concentrations of PM10-like dust and diesel particles. After 24 hours the researchers performed a process, known as western blotting, to detect the levels of specific proteins in the cells.
The results showed that the presence of PM10 and diesel particles decreased levels of B-catenin, the protein responsible for hair growth. The study also revealed that the levels of three other proteins—cyclin DI, cyclin E and CDK2, which are responsible for hair growth and hair retention, were decreased by PM10-like dust and diesel particles in a "dose-dependent" manner.
Dr Hyuk Chul Kwon, who led the study at the Future Science Research Centre, said, “While the link between air pollution and serious diseases such as cancer and lung diseases is well established, there is little-to-no research on the effect of particulate matter exposure on the human skin and hair in particular. Our research explains the mode of action of air pollutants on HFDPCs, showing how the most common air pollutants lead to hair loss. ”
Sources of PM include the burning of fossil fuels--petrol and diesel, as well as other solid fuels, and other industrial activities such as building, mining and the manufacturing of building materials like bricks.
“While it is difficult to escape from the surrounding pollution, limiting the time for walking in busy streets, especially during rush hour, should help reduce exposure, ”said Dr Kwon. "If you are exercising outdoors, try to do so in areas that are less polluted and do not spend too much time waiting at traffic hot spots such as traffic lights. "
1. What did the new study find?| A．Air pollution can do great harm to our lungs. |
| B．The color of our skin can be influenced by air pollution. |
| C．Serious air pollution can probably prevent hair from growing. |
| D．Air pollution can affect hair growth by entering the bloodstream. |
| A．His new research is superior to previous research. |
| B．The research he conducted is really of great importance. |
| C．The results of his new research need to be further improved. |
| D．A link between air pollution and diseases needs to be established. |
| A．To do as much exercise as possible. | B．To take action to reduce air pollution. |
| C．To avoid being exposed to air pollution. | D．To take public transport to avoid traffic jams. |
The world itself is becoming much smaller by using modern traffic and modern communication means. Life today is much easier than it
Man has been polluting the earth. The more people, the more pollution. Many years ago, the problem was not so serious
Air pollution is still the most serious. It’s bad for all living things in the world. Water pollution kills our fish and pollutes our drinking water. Noise pollution
Many countries are making rules
9 . A ten-year-old sperm whale(抹香鲸）was found dead on a beach in Scotland.A necropsy(尸检）revealed that nearly 100 kilograms of plastic and other trash had formed clumps(硬块）in its digestive system.The tragedy quickly made headlines.Why would a top predator in the ocean eat gloves,rope,and plastic cups?
Conventional wisdom suggests that marine animals eat plastic because it is there and they don't know any better.It is true that plastic may smell like food to some of them.But that doesn't explain why only certain types of whales-deep-diving toothed whales,such as sperm whales and pilot whales-turn up dead on beaches with stomachs full of plastic.
It's possible,says Savoca,that plastic trash sounds like food to toothed whales.These species
hunt deep in the ocean,sometimes nearly 500 meters below the surface,where it's pitch black(漆黑）。They use echolocation(回声定位）to hunt for food,typically squid(乌贼）。
By contrast,baleen whales(须鲸），including humpbacks and blue whales,have natural filters(过滤器）for their food.Baleen,the brush-like filter-feeding system they have in place of teeth,as well as their narrow throats,keeping them from swallowing anything much larger than the krill(磷虾群）that forms the basis of their diet.That could help explain why baleen whales are not ending up with plastic filled stomachs.
Fifty years ago,there was almost no plastic in the ocean.The lifespan of a large whale can be
twice that long.In the lifetime of a single whale,we went from an ocean with no plastic to hundreds of thousands of tons of it.Plastic comes on top of other factors affecting life in the ocean-climate change,overfishing,shipping traffic,and noise pollution."it's a real shame because their lives are challenging enough even without the additional pressure we put onto them,"says Savoca.
1. What does Paragraph 2 mainly talk about?
| A．That plastic smells like food to toothed whales. |
| B．That marine animals started to eat plastic decades ago. |
| C．That a number of toothed whales are found dead on beaches every year. |
| D．That conventional wisdom about why marine animals eat plastic doesn't apply to all whales. |
| A．They don't feed on krill. |
| B．They live in the dark depths of the ocean. |
| C．They are not born with brush-like filter-feeding systems. |
| D．They don't determine the location of their food with their eyes. |
| A．Whales have a longer lifespan than humans. |
| B．Plastic has a negative effect on climate change. |
| C．Great changes have taken place in the ocean in the past 50 years. |
| D．Plastic pollution has worsened already serious issues affecting marine life. |
| A．Different diets,different fates |
| B．Silent killers in the ocean |
| C．Plastic trash in-the ocean |
| D．Saving whales |
10 . Children exposed to “safe” levels of air pollution in the womb(子宫) develop brain damage that damages their concentration, a study has shown.
The research is the first too link common pollutants such as nitrogen(氮) dioxide and soot(油烟) to changes in the brains of unborn babies that mean they may struggle to focus at school in later life. The findings suggest that even comparatively clean city air could lead to worse academic performance and an increased risk of mental health problems such as addition or attention deficit hyperactivity disorder(缺陷多动障碍).
In recent years scientists have found that children who grow up surrounded by air pollution are more likely to have a broad range of “neuro(神经)developmental” difficulties, including autism and various kinds of cognitive(认知) damage. However, only a handful of studies have looked at the ways in which the poisonous gases and microscopic particles(微粒) that mothers and young children take in affect the brain during critical stages of its growth.
A group led by Monica Guxens, of the Barcelona Institute for Global Health, found that exposure to air pollution before birth appeared to have slowed the development of several brain regions that play an important role in people's capacity for selfdenial and sustained effort. This lack of inhibition could in turn cause “cognitive delays” when the children get older, the scientists argue in Biological Psychiatry.
“We need this function in our daily life，” Dr. Guxens said. “It controls our impulses(冲动) and our selective attention. Children need it to learn and for making decisions in later life. We're interested to see what will happen: is there going to be an impact on their academic work, are there going to be clinical implications? It might be that this will lead to problems later.”
The results were drawn from MRI scans of 873 children between the ages of six and ten in Rotterdam. Even though 99.5 percent of their mothers had lived with nanoparticle pollution levels well below EU legal limits while they were pregnant the pollution still appeared to have taken its toll(伤亡人数).
Children who had been exposed to more pollution in the womb did worse on a test of their ability to block out irrelevant stimuli(刺激). They also had thinner outer layers in the precuneus(楔前叶) and the rostral middle frontal regions of their brains, both of which are involved in cognitive inhibition, which refers to the mind's ability to tune out stimuli that are irrelevant to the task at hand or to the mind's current state.
Experiments on animals show that socalled fine particles are able to pass through the placenta and affect the brain of the fetus(胎儿). Dr Guxens said there were probably no such thing as a safe concentration of air pollution.
1. What is the main idea of the passage?| A．Children's brain growth slowed by “safe” pollution. |
| B．The safe level of air pollution for pregnant women. |
| C．Factors leading to children's poor academic performance. |
| D．The problems children have when surrounded by pollution. |
| A．Academic work. | B．The lack of inhibition. |
| C．Selective attention. | D．The ability for selfdial and sustained effort. |
| A．air pollution has claimed many lives of kids |
| B．people can't focus on air pollution enough |
| C．the majority of pregnant women are free from air pollution |
| D．kids exposed to more pollution have poorer cognitive inhibition |
