1 . Thanks to its harsh environment, Antarctica remained largely untouched by humans for many millennia, allowing a thriving (旺盛的) ecosystem to evolve. However, since the 1990s, the last true wilderness on the planet is becoming an increasingly popular destination for adventure-seeking tourists. Now, a new study declares that the visitors may be leaving behind harmful bacteria which could devastate the area’s native bird population.
Humans can infect animals with illnesses such as the flu. Researchers, however, believed that the Antarctic animals were immune to the danger due to the continent’s extreme weather. However, microbiologist Marta Cerda-Cuellar was not convinced.
She and some colleagues decided to examine waste samples from Antarctic birds for evidence of human bacteria. To ensure the waste was not polluted, the scientists had to collect it from the birds themselves.
The results of their study revealed the presence of several types of human bacteria in the bird waste. This included a common strain (品种) of bacteria that causes food poisoning in humans. The researchers say the bacteria strains were resistant to commonly-used human antibiotics (抗生素),indicating they were brought in by the visitors, rather than migratory birds (候鸟).
“These strains, which are a common cause for infections in humans and livestock, do not usually cause death outbreaks in wild animals,” says Gonzalez-Solis. “However, the emerging or invasive pathogens (病原体) that arrive to highly sensitive populations could have severe consequences and cause the local collapse and extinction of some populations. “The researcher also fears the presence of these bugs could foreshadow the arrival of other, more deadly, pathogens as the number of tourists people increases.
Experts believe the only way to prevent the mass destruction of the birds is to impose stricter regulations or, at least, put the ones already in place into effect. For example, while the Antarctica Treaty requires visitors to carry their waste back home to safeguard the pristine environment, the regulation is rarely enforced. Nowadays, some officials are taking steps to save the vulnerable birds before it’s too late.
1. What problem is Antarctica facing according to Paragraph 1&2?A.The increasing number of tourists. |
B.The worsening wilderness. |
C.The replaced native bird population. |
D.The spread of infectious illnesses. |
A.To treat their illness. | B.To get their waste. |
C.To raise them as pets. | D.To study their lifestyles. |
A.Bacteria can be killed by human antibiotics. |
B.Extreme weather keeps Antarctic animals healthy. |
C.Humans bring bacteria to Antarctica. |
D.Antarctic animals are immune to human bacteria. |
A.Indifferent. | B.Doubtful. | C.negative. | D.Optimistic. |
2 . Tips for Green Travel with Kids
Travelling doesn’t mean letting go of all the eco-friendly choices we work so hard to achieve in our daily life. Here are a few tips for green travel with kids.
Booking nonstop flights whenever possible will reduce carbon emissions (碳排放). If the closest local airport doesn’t have nonstop flights to a certain place, check with other local airports to see if nonstop flights are available.
It’s easy when travelling to pull in to fast food restaurants for snacks.
A.Walking is good for your health. |
B.Try to cut back to save water and energy. |
C.But you can pack healthy food from home. |
D.Travelling is a great chance to introduce your kids to the world. |
E.Reusable water bottles are easy to bring along wherever you travel. |
F.Save energy by turning off the hotel room lights when you head out for the day. |
G.You might have to drive a bit farther, but saving on carbon emissions makes it worthwhile. |
3 . Do you know that the oldest tree is a 5, 000-year old bristlecone pine (狐尾松) located in the forests of Nevada? Unfortunately, many of these precious old-growth trees are starting to disappear from our planet. The term old-growth refers to trees that are 150 years or older. This means that many of the trees on the Earth today are younger, smaller, and have shorter lifespans.
As the Earth’s temperature warms up due to climate change, it is having unintended effects on the world’s forests. When temperatures rise, trees close their pores (气孔) to prevent the loss of moisture, and this, in turn, slows down the process of photosynthesis (光合作用). As a result, these trees are shorter and grow slowly, as well as have a high deathrate. Climate change also increases the possibility of droughts and wildfires. After wildfires, it takes a while for the forest ecosystems to recover, and in some cases, the forests are lost permanently. Trees that are stressed are also susceptible (易受影响的) to attacks by bacteria (细菌). Finally, humans have changed the forest landscape through logging (伐木).
There are some who claim that increased greenhouse gas emission is helping trees grow faster because CO2, is needed for photosynthesis. While some younger trees may benefit from this, we are seeing significantly more loss of forests than gain.
Old-growth forests are a storehouse of carbon, and when they die, the stored CO2, is released into the air worsening the greenhouse effect. Older forests have higher biodiversity, which is beneficial as each organism has a role to play and there is a wide variety of species. As these forests disappear, species that once called them “home” are forced to relocate, affecting the biodiversity of those ecosystems. Unfortunately, some endangered species are unable to adapt and go extinct.
With trees dying continuously, will future generations miss out on the wonders of forests?
1. What is the main idea of the second paragraph?A.Why bacteria may attack old trees. | B.What leads to the rising temperatures. |
C.Why old-growth forests are disappearing. | D.How global warming causes natural disasters. |
A.Species. | B.Older forests. | C.Organisms. | D.Roles organisms play. |
A.a doubt | B.a warning | C.a blame | D.a suggestion |
A.To urge people to reduce gas emission. | B.To explain the greenhouse effect on trees. |
C.To introduce the process of photosynthesis. | D.To call on people to protect old-growth trees. |
There comes a time when the old must give way to the new. Finding and
In the 1950s, the Egyptian government wanted to build a new dam across the Nile
After listening to the experts’ opinion, the government turned to the United Nations for help. Then a committee
5 . Used electronics are piing up fast: they are filling up landfills with dangerous pieces of waste. Some e-waste is relatively large, such as air conditioners; other e-waste is more unnoticed, such as smart labels that contain disposable batteries and other equipment.
“It’s these small batteries that are big problems,” says University of California, Irvine, public health scientist Dele Ogunseitan, who is a green technology researcher and adviser for major tech companies and was not involved in developing the battery. “Nobody really pays attention to where they end up.” Researchers at the Cellulose & Wood Materials Laboratory at the Swiss Federal Laboratories for Materials Science and Technology are working to address this problem. Their new paper describes a water-activated paper battery developed from environmentally friendly materials that could eventually present a sustainable alternative to the more harmful batteries common in low-power devices.
The paper battery has the same key components as standard batteries but packages them differently. Like a typical chemical battery, it has a positively charged side and a negatively charged side. A traditional battery’s components are covered in plastic and metal; in the new battery, however, the positively and negatively charged sides are inks printed onto the front and back of a piece of paper. That paper is filled with salt, which dissolves (溶解) when the paper becomes wet. When the paper is dry, the battery is shelf-stable. Once the paper is wet, the battery starts working within 20 seconds. The new battery’s operating performance declines as the paper dries. When the scientists rewet the paper during testing, the battery regained function and lasted an hour before beginning to dry out again.
That future may not be so far off. It is hard to predict a time line for manufacturing such items at scale, but the head of the study says he is in contact with potential industry partners and believes these batteries could make their way into products within the next two to five years.
1. Why is e-waste mentioned in paragraph 1?A.To introduce the topic. | B.To give people warning. |
C.To show the seriousness of it. | D.To call on people to take action. |
A.Objective. | B.Carefree. | C.Indifferent. | D.Concerned. |
A.The difference between the paper battery and the traditional battery. |
B.The working principle of the paper battery. |
C.The problem of the paper battery. |
D.The advantage of the paper battery. |
A.Paper battery: Is it far off? |
B.Paper can work wonders. |
C.Paper battery: A creative way to reduce e-waste. |
D.Let’s work together to fight e-waste. |
6 . The endangered pandas in the Qinling Mountains might face a new threat: the loss of their food, bamboo, which makes up 99% of their meals.
Adult pandas spend most part of the day eating bamboo and have to take in at least 40 pounds a day to stay healthy. However, a new study published in Nature Climate Change warned that they may soon find their food gone because most of the bamboo in the Qinling Mountains might disappear by the end of the century as a result of rising temperature worldwide.
A team made up of researchers from Michigan State University and the Chinese Academy of Sciences has studied the effects of climate change on the bamboo in the Qinling Mountains. They have found that bamboo is very sensitive to climate changes. “80% to 100% of the bamboo would be gone if the average temperature rises 3.5 degrees worldwide by the end of the century,” said Liu Jianguo, one of the report’s authors.
He added, “This is how much the temperature would rise by 2100 even if all countries will keep their promises in the Paris Agreement. But you know what is happening all around the world.”
In recent years, China has been trying its best to protect the endangered pandas by setting up more and bigger natural reserves.
“But it is far from enough and the endangered pandas need cooperation from the rest of the world, because their future is not just in the hands of the Chinese,” said Shirley Martin from the World Wildlife Fund but not a member of the team.
The Qinling Mountains, in the southwest of China, are home to about 260 pandas. That is about 13% of China’s wild panda population. In addition, about 375 are living in research centers and zoos in China.
1. How many wild pandas are there in China?A.About 260. | B.About 635. |
C.About 2,635. | D.About 2,000. |
A.China needs more help from the World Wildlife Fund. |
B.It is difficult to control the temperature rise within 3.5℃. |
C.Bamboo is sensitive to the changes of temperature. |
D.China is making great efforts to protect the pandas. |
A.The Qinling Mountains can provide enough bamboo for the pandas. |
B.Pandas in the Qinling Mountains are only threatened by the loss of food. |
C.Lots of the bamboo in the Qinling Mountains will probably disappear. |
D.Pandas have already eaten 99% of the bamboo in the Qinling Mountains. |
A.The Disappearance of Bamboo |
B.Necessity to Change Pandas’ Food |
C.A New Threat Faced by the Pandas |
D.Efforts Made to Save Pandas |
7 . Since the show of the first Lion King film, nearly half of all lions have been lost. These big cats are now believed to be locally extinct in 16 African nations where they once lived, and it may not be long before we have no lions left. Environmentalists recognize a world connection between ecosystems and the biodiversity (生物多样性) they support. Lions depend upon many more living things than just lions. They are not considered separately.
The story of the decease and re-appearance of North America’s gray wolves in Yellowstone National Park serves as a reminder of what can happen when we keep our eye on animals’ broader connections to the world. After people killed off wolves in Yellowstone in the early 1900s, the deer population increased, greatly reducing the number of willow tees, which the deer fed on. This in tum forced beavers that relied on the willows to move out. Without the beavers building dams, the whole system changed, lowering the water table, which affected all the other species that had adapted to live in this system.
When wolves were introduced again in 1995, we gained a special view into this connection. The wolves killed deer, which allowed the willows to grow. Beavers returned, building new dams that helped fish, birds and so on to increase as well. This shows that ecosystems have great ability to return to normal after the changes like serious weather events, droughts, fires and so on.
In Africa, the relation between lions and the larger landscapes shows the greatest challenge. One recent study suggests that if we want lions to recover to levels similar to those when the first Lion King movie was produced, it will take about a billion dollars a year, mainly to better manage the national parks and other protected areas where lions survive.
1. What does the underlined part in Paragraph l probably mean?A.Lions also make friends with other animals. |
B.Lions need various living things to satisfy their hunger. |
C.The survival of lions is closely related to other species. |
D.The number of lions is smaller than that of other creatures, |
A.The water table was lifted to a higher level. |
B.The local creatures’ living ability had increased. |
C.The greening area of the park was well protected. |
D.The ecological balance of the park was destroyed. |
A.Each animal has its own unique charm. |
B.The ecosystem has strong ability to repair itself. |
C.Proper measures can make the damaged ecosystem recover. |
D.The balance of the ecosystem has a great influence on humans. |
A.They are badly in need of enough living space. |
B.Increasing their population is challenging work. |
C.Their living conditions are well shown in Lion King. |
D.A lot of money has been spent to build protected areas for them. |
Litter is everywhere, doing great harm to the environment and life on our planet. Jeff Kirschner, who wants to build a litter-free world, started a global community named Litterati
The story began with his 6-year-old daughter. One day they were going on a hike
Jeff started to take action. He created Litterati, an app that makes it fun to pick up litter. The idea is
Litterati is more than an app,
9 . Garbage sorting (分类) has become a hot topic around China, especially after Shanghai began carrying out a regulation (规章) on July 1.
Beijing has been expected to do the same. At present the regulation gives garbage sorting responsibilities to government departments, property management groups and other organizations. It also gives rules for companies, explaining how they’re responsible for waste collection, transportation and treatment. Citizens are free of responsibilities for the moment.
The long-awaited revision will soon change the situation. “Taking out the trash without sorting it properly will be illegal,” said Sun Xinjun, director of the Beijing Commission of Urban Management. In Shanghai, violators (违背者) are now fined up to 200 yuan for trash-sorting violations. “The maximum fine in Beijing will not be less than that,” he said.
The Beijing city government first promoted garbage sorting in 2009. Authorities have since called on citizens to sort their household waste into four types—recyclable waste, kitchen trash, dangerous waste and others , and leave it in a colored dustbin or trash can. Blue-colored dustbins are for recyclable items, green for kitchen trash, red for dangerous materials and grey for other waste.
To promote the awareness of garbage sorting and expand the base of participants, authorities have employed workers to help citizens. With intelligent devices, those who throw in recyclable waste at given places will be rewarded with bonus points, which can be used to buy daily goods. At some communities, there are no color-coded dustbins. Instead, a scheduled garbage collection service is offered to help improve the environment. In other communities, workers offer a door-to-door service to collect recyclable or kitchen waste.
Beijing Environmental Sanitation Engineering Group has been promoting new garbage sorting facilities such as recycling cabinets and smart kitchen waste trash cans since 2016, Xinhua News Agency reported.
1. Which of the following shouldn’t be thrown into a blue dustbin?A.Coke cans. | B.Thrown-away batteries. |
C.Used books. | D.Broken iron pots. |
A.citizens are not responsible for garbage sorting in Beijing now |
B.recyclable waste like newspapers should be thrown in green dustbins. |
C.people sorting recyclable waste will be rewarded in Beijing |
D.Shanghai carried out garbage sorting later than Beijing |
A.An Example in Garbage Sorting in Shanghai |
B.Action to Be Taken to Sort Garbage in Shanghai |
C.New Garbage Sorting Regulation in Beijing |
D.Present Garbage Collection in Beijing |
A.A fashion magazine. | B.A science book. |
C.A newspaper. | D.A government report. |
10 . A Plastic Ocean is a film to make you think.Think,and then act.We need to take action on our dependence on plastic.We’ve been producing plastic in huge quantities.Drinking bottles,shopping bags and even clothes are made with plastic.
The film begins as a journey to film the largest animal on the planet,the blue whale.But during the journey the filmmakers make the shocking discovery of a huge,thick layer of plastic floating in the Indian Ocean.
In the film there are beautiful shots of the seas and marine life.
They present short-term and long-term solutions.These include avoiding plastic containers and recycling as much as you can.The filmmakers also stress the need for governments to work more on recycling programmes.
We make a shocking amount of plastic.Over 300 million tons of plastic are produced every year,and at least 8 million of those are dumped into the oceans.The results are disastrous,but it isn’t too late to change.
A.This causes them to travel around the world to look at other affected areas. |
B.Once you’ve seen the film,you’ll realize it is time to do our part. |
C.It has raised public concern all over the world. |
D.We live in a world full of plastic,and only a small amount is recycled. |
E.But the film doesn’t only present the negative side. |
F.In conclusion,we only have one earth to live on. |
G.These are contrasted with dumps of plastic rubbish. |