1 . How to Go Green

The idea of “going green” means that you’ll try to reduce your impact on the environment. It’s a great way to improve the planet.     1    .

Walk or bike to places if you live close enough.

    2    , so they’re not a friend to the environment. Walking or biking instead of using a car is a great way to save natural resources while saving you money. When possible, walk or bike to work, school or shops.

    3    .

Communicate digitally whenever possible, and only print out items when you absolutely must. When you do use paper, recycle it or save it to reuse the other side of it.

Buy second-hand products or borrow items instead of buying something new.

Buying things produces more waste and pollution, so try not to buy things you don’t need. When you do need something, shop at local second-hand market or use online resale shops.    4    .

Skip products that have a lot of packaging.

Products that come with a lot of packaging are bad for the environment because the packaging is waste. Even if you recycle the package, it’s still an unnecessary waste of resources.    5    . This can keep more trash out of landfills and save natural resources.

A．Cars use up a lot of gas

B．Limit your use of paper

C．Use reusable bags while you’re shopping

D．If you’re ready to go green, start from the following good habits

E．Do your best to pick products that have as little packaging as possible

F．In order to save money, cut down on the cost of paper you’re using

G．If you can, borrow items that you don’t use often, like tools, from a friend

2 . While waste within the convenience economy should certainly be solved, it is neither realistic nor sustainable to work towards the complete abandonment of plastics for packaging and other convenience items. Plastics play a crucial role in preserving products both physically and from the effects of water, oxygen and other things. Further, we cannot over-rely on recycling when we consider weak market interest in low-grade materials.

What we need is a strong focus on improving the sustainability of the plastics that we will continue to need. For these plastics, the clear goal should be to stop the use of oil. We must turn to materials based on natural, renewable resources and produce plastics that have minimal impact on the environment after multiple use. Several of these products are already available on the market, but the key to challenging the dominance of oil-based plastics is extending and developing the capacity and range of such products with new material science.

Industrial biotechnology is becoming a cornerstone of the bio-economy. It involves working with natural processes to extend biochemical pathways that can be used in manufacturing (制造业). It has the potential to improve how we manufacture materials and allow us to produce entirely new materials, at the same time protecting the environment and reducing costs.

At Biome Bio-plastics, for example, our industrial biotechnology development programme has already successfully produced bio-based chemicals at sufficient scale (规模) for industrial testing from lignin, the woody material in plants and other renewable carbon sources. Availability of these chemicals could-completely transform the bio-plastics market, creating natural polymers (聚合物) that can compete with oil-based polymers on both cost and functionality. We believe that our product can deliver important changes across the materials industry and provide a critical tool in the fight against plastic pollution.

1. What does paragraph 1 mainly focus on concerning plastics?

A．Their source materials.	B．Their vital importance.
C．The problems they cause.	D．The methods to abandon them

2. What does the author think of future plastics?

A．They should be eco-friendly.	B．They could be a bit expensive.
C．They could be replaced by plant products	D．They should be made from used things.

3. What makes it possible for Biome Bio-plastics to create their competitive polymers?

A．The high cost of carbon sources.

B．The wide variety of their products.

C．The low availability of oil-based polymers.

D．The application of industrial biotechnology

4. Who is the author most probably?

A．A newspaper journalist.	B．A government officer.
C．A company manager.	D．A university researcher

4 . Have you ever observed how a family runs smoothly? It’s the balance that plays a role in a family. But a family where there is too much chaos (混乱), argument, and one-sided communication has no balance. As a result, such a chaotic family suffers consequences like divorced parents, distances between children.

In the same way, nature needs balance, harmony and protection. You are already aware of the phrase — too much of everything is bad. That’s why the sensibility to bring balance in nature is every human’s responsibility.

The community of living species interacts with the environment’s non-living components in a healthy ecosystem. Rainfall, temperature, sunlight, soil, and water chemistry are the main examples of abiotic (无生命的) aspects of ecosystems that need to be in a stable manner.

       To survive, plants need a certain combination of temperature, moisture, and soil chemistry. Protecting plants is also important because it provides food for the animals. 

What you see above are the natural phenomena that have been happening since the beginning of the universe. That’s how nature has been functioning. But indulgent human activities in using natural resources has created poor habitation in the natural environment. In fact, here are the human actions that have broken the balance in nature for so many years now.

      People cut down trees to make space for new companies owing to an increase in population, which has decreased the amount of oxygen in the air. Global warming has resulted in the melting of the ice caps, leading to rising sea levels and other natural disasters like cyclones and tsunamis. As a result of habitat loss, it is getting harder for species to survive.  

To bring the Earth to its original form is impossible. But there is always a potential for bringing awareness. Hence, if the above human activities are lessened or changed with recycling activities, the next generation can still live a healthy life.

1. Why is a chaotic family mentioned in paragraph 1?

A．To bring up a new topic.

B．To come to a conclusion.

C．To complain about family chaos.

D．To admire the balance of a family.

2. How do we keep the balance of nature?

A．Limit human activities to the fullest.

B．Control a certain amount of everything.

C．Don’t cut down trees for new companies.

D．Don’t use energy for economic development.

3. Which does the underlined word “indulgent” in paragraph 5 probably mean?

A．Responsible.

B．Controlled.

C．Romantic.

D．Unlimited.

4. What’s the author’s attitude towards the future of the Earth?

A．Worried.

B．Doubtful.

C．Confident.

D．Uncertain.

5 . The Federal Communications Commission of the US recently issued the first-ever fine for space junk, against the Dish Network. The satellite television company failed to properly deal with one of its satellites, leaving it at a lower orbit than it promised when securing its license.

Some space junk was discarded during missions — maybe an astronaut dropped his lucky penny, or released an instrument’s camera cover after it was no longer needed. Other junk, however, is the result of collisions: Even that lucky penny, traveling at 15 times the speed of a bullet, can cause huge damage — ending a satellite’s mission or, worse, breaking that satellite into pieces.

That’s obviously bad news for satellites. The solution isn’t to demand the launch of fewer satellites; these bring real benefits to people on the Earth.

And while traffic management is certainly necessary, pieces of garbage are never going to be able to follow even the most sensible rules of the orbital road. That means two things need to happen: People need to stop littering, and they need to take out some trash.

The professionals, unsurprisingly, have more carefully considered names for these processes — mitigation (减轻) and remediation (补救). Any time a company wants to put a satellite in the sky, it should have a clear plan for the instrument’s end of life. For objects in very high geostationary orbit (地球同步轨道), this usually involves sending the item to the out-of-the-way “graveyard” orbit. For objects lower down, it tends instead to involve moving them lower still, so that they will bum up upon reentering the atmosphere.

Active removal of garbage that has failed to get out of the way is technically tricky, but at least for large objects, remediation is possible.

Encouragingly, some countries are beginning to try. No nation, however, can save space on its own. A global convention (协定) to set a 21^st-century code of conduct for space is in order.

1. What does the underlined word “discarded” in paragraph 2 mean?

A．Collected up.	B．Thrown away.
C．Produced.	D．Ignored.

2. Why can’t we reduce the number of satellites launched every year?

A．The satellites benefit our life a lot.

B．We need new satellites to replace old ones.

C．Countries are using satellites to occupy space.

D．We must make a deeper exploration into the universe.

3. Which of the following are the measures of stop littering?
① Sending satellites to the “graveyard” orbit.
② Moving objects lower still.
③ Active removal of debris.

A．①②

B．②③

C．①③

D．①②③

4. What’s the author’s purpose in writing the text?

A．To provide solutions to space junk.

B．To explain the damage of space junk.

C．To call upon countries to fine companies making space junk.

D．To appeal to nations for the protection off space environment.

7 . For uncounted generations, trillions of coral polyps (珊瑚虫) have lived and died, leaving behind a material called limestone. Throughout History, limestone was used to construct the Great Pyramid of Egypt, as well as many churches and castles.       1    . We can call them reefs (礁体). They can be even larger in scale than the most impressive buildings and structures made by humans.

    2    

Indeed, a living coral reef is remarkable, a “city beneath the sea” filled with a rich variety of life. Most coral reefs can be found in warm, shallow oceans. They occupy just a small part of the ocean floor, but host 25 percent of all ocean life. Each reef is full of colorful fish as well as coral that forms wonderful patterns. In addition to their beauty, the reefs are an important food source for fish, and for. humans.

Threats to coral reefs

    3    . For example, reefs can be damaged when the coral is taken for use in building materials or jewelry-making. Illegal fishing methods also harm reefs. These methods can help fishermen get a good catch, but their negative effects on the reefs are significant. Blast fishing involves setting off bombs in the water to kill as many fish as possible.     4     In addition, global warming has caused many reefs to become sick. A 2018 UN Report predicted that up to 99 percent of the world’s coral reefs may decline if global warming continues.   

Reasons for hope

These threats to coral reefs are very serious, but there is reason to hope that they will survive. If we take steps toward coral reef conservation, it is likely that these tiny creatures — which survived natural threats for millions of years — will be able to rebuild. As conservationist Robert Richmond says, “    5    . ”

A．A diversity of life

B．A city above the sea

C．Given a chance, they can come back

D．Yet the greatest limestone structures in the world are built underwater

E．Various human activities can cause great harm to the world’s coral reefs

F．As a result, the fish became stunned, which makes them easy to collet.

G．This kills most living things nearby and causes damage to the reef’s structure

8 . Whales are celebrated for being the largest and most intelligent creatures in the ocean. Now, biologists have discovered that they also capture (捕获) tons of carbon from the atmosphere, a service with an economic value of US $1 trillion for all the great whales, according to a new study published by the International Monetary Fund. The study points out that protecting whales, normally viewed as a human good, also has a monetary motivation.

“The carbon capture potential of whales is truly incredible,” said the report. “Our conservative estimates put the value of the average great whale at more than US $2 million, and easily over US $1 trillion for the current stock of great whales.” Whales absorb carbon in their bodies during their long lives, some of which stretch to 200 years. When they die, they sink to the bottom of the ocean, taking the carbon with them. According to the study, each great whale traps around 33 tons of carbon dioxide on average. A tree during the same period only contributes to 3 percent of the carbon absorption of the whale.

Whale populations are today a smidgen of what they once were. It is estimated that there are slightly more than 1.3 million whales in the ocean, a quarter of their pre-whaling number of 4 to 5 million. Some species in particular, like the blue whale, are only 3 percent of what they used to be. “We can create financial methods to promote the restoration of the world’s whale populations,” said the report’s authors. “Rewards could help those who pay significant costs as a result of whale protection.”

With the Paris Agreement coming into force next year and the effects of climate change ever more widespread, we must prevent the harm to whales. Researchers analyzed that unless new methods are put forward, it would take over 30 years to double the number of current whales, and several generations to return them to their pre-whaling numbers. “Society and our own survival can’t afford to wait this long,” they said.

1. What does the new study reveal about whales?

A．They are money-makers for good.	B．Their intelligence is unquestionable.
C．They are a natural climate solution.	D．Their survival is threatened by carbon.

2. Why is a whale compared with a tree in paragraph 2?

A．To indicate all matter regarding green efforts.	B．To illustrate whales are friendly to the oceans.
C．To highlight whales’ carbon capture potential.	D．To emphasize the importance of tree planting.

3. What can be inferred from what researchers said in paragraph 4?

A．Climate change intensifies.	B．Whale populations stay low.
C．Our survival is endangered.	D．Whale protection is a priority.

4. What is the most suitable title for the article?

A．Protect whales to protect the planet	B．How to restore whale populations
C．Live in harmony with ocean giants	D．Whales can guarantee our survival

10 . Despite the difficulties, the California coastal ecosystem is improving, largely thanks to the huge appetite sea otters (海獭) have for crabs. In a creative study, scientists revealed the return of otters to their former habitat in a Central California river mouth has slowed the decrease of the area’s river banks by up to 90%. “It would cost tens of millions of dollars for humans to rebuild these stream banks and restore these rivers. The otters are stabilizing them for free, in exchange for an all-you-can-eat crab feast,” said biology professor Brian Silliman, Ph. D. at Duke University.

Like many California river mouths, Elkhorn once was a habitat for otters, which need to eat around 20 to 25 pounds of food every day, with crabs being one of their favorite meals. But after fur traders hunted the local otter population nearly to extinction, the number of crabs exploded over the next century. Crabs dig into salt river soil, and over time can cause a salt river to wear away and collapse. Today, years after the otters returned, rivers and stream banks became more stable.

Angelini, one of the study’s authors, said that tool is an encouraging sign for her team as they face similar threats to Florida’s coastlines from sea level rise, storms, and extra nutrients overflowing into coastal waters. “All these seem unsurmountable,” Angelini said. “However, this study shows that, if we truly understand the ecosystem and know what tools to use, we can see significant benefits to the health and stability of these systems.”

The research team conducted large-scale surveys across 13 tidal (潮汐的) streams, as well as small-scale field experiments at five locations around the river mouth over a six-year period. Otters were not included in some lest sites but allowed to be used in others, using a caging system designed by Angelini.

“And all these years later, we now see these amazing results. It’s an inspiring story about the benefits of conservation and persistent, long-term research,” Angelini said.

1. What does Brian Silliman think of the function of sea otters?

A．It’s complex.	B．It’s expensive.
C．It’s effective.	D．It’s inefficient.

2. What made the sea otters in Elkhorn nearly die out?

A．The collapse of salt rivers.

B．The hunting for their fur.

C．The decrease of the sea crabs.

D．The pollution of their habitat.

3. What does the underlined word “unsurmountable” probably mean?

A．Hard to understand.	B．Difficult to deal with.
C．Impossible to avoid.	D．Dangerous to settle.

4. What is Paragraph 4 mainly about?

A．The process of the research.

B．The purpose of the research.

C．The limitation of the research.

D．The discovery of the research.