Since the first factories began manufacturing polyester (聚酯) in the 1950s, humans have produced about 9. 1 billion tons of plastic. And about 12 percent has been burnt, releasing harmful gases into the air. Most of the rest has ended up in landfills and in the natural environment. Plastic inhabits the oceans, cities and national parks, in large or tiny pieces.
Carbios is among the companies that are attempting to commercialize a type of chemical recycling, which breaks down polymers into their fundamental moleculars, called monomers (单体). Those monomers can then be recombined into polymers that are as good as new.
But some experts warn that chemical recycling may face many of the same issues that already plague the recycling industry, including competition from cheap plastics made from the raw materials. For the past several years, Carbios has been improving a method that uses an enzyme (酶) found in a microorganism to convert polyethylene terephthalate (PET), a common ingredient in plastic bottles, into its monomers.
Enzymatic recycling’s promise isn’t limited to PET: the approach can be applied to other plastics. In early experiments, it took weeks for enzymes to process just a part of a batch of PET. In 2020, Alain Marty, chief science officer at Carbios, announced they’d developed an enzyme that could stand warmer temperatures and change nearly an entire batch of PET into monomers in a matter of hours.
Most PET produced globally is used for textile fibers, which, because they often contain mixed materials, are rarely recycled. Mats Linder, leader of Stena Recycling in Sweden, said he’d like to see recycling technologies focus on these and other parts of the recycling industry where conventional recycling is coming up short.
As it happens, Carbios is working to do just that. Gregg Beckham, a senior research fellow at the National Renewable Energy Laboratory, believes the global plastic problem will call for a diverse mix of technological solutions. He thinks enzymatic recycling and other recycling technologies are advancing rapidly, and he’s optimistic that they’ll have a role to play.
1. What can be inferred from the first paragraph?A.Polyester has been made for a century. | B.Most plastic is not recycled. |
C.People should stop using plastic. | D.Most plastic is buried in landfills. |
A.Trouble. | B.Inspire. | C.Influence. | D.Determine. |
A.Many companies have been using this method. |
B.Enzymatic recycling can only be used to break down PET. |
C.It was Carbios that invented enzymatic recycling. |
D.Great progress has been made in enzymatic recycling. |
A.Enzymatic recycling is costly but effective. |
B.Carbios is the pioneer in recycling plastic. |
C.Enzymatic recycling has a bright future. |
D.Chemical recycling technologies are limited. |
相似题推荐
【推荐1】More than 2,600 enterprises gathered and presented their advanced products at the China International Import Expo (CIIE). And many innovative products have made their world premiere. Let’s have a look at three of them.
Quick corona-virus test machine
Nucleic acid testing could be faster in the future. King Fisher Apex, made by the Finnish tech company Thermo Fisher Scientific,can complete the extraction of 96 nucleic acid samples in just 15 minutes. The tester can purify nucleic acid and protein automatically to save researchers’ time spent on additional steps, significantly improving nucleic acid test efficiency. Also, the system eliminates manual intervention. The risk of exposure to harmful re-agents or biological samples, such as blood,is greatly reduced for medical staff.
Myopic (近视) prevention glasses
Here comes a lifesaver for teenagers with poor eyesight — a myopic control lens. Whether it’s a classroom blackboard or a tablet,an outdoor activity or a mobile phone game, the Stellest lens from Essilor, a French company, keeps the same control effect, with changeable viewing angles and constant visual clarity. The lens can create a beam in front of the retina that will slow down the increase of the eye axis. Therefore, the development of myopia can be contained.
Portable kayak
A folding,portable,18-kilogram“backpack”can be inflated into a kayak. The safe, lightweight ITIWIT X500 Kayak,made by Decathlon,a French sports goods group, makes kayak racing accessible to the majority. It consists of five“air chambers”, so even if two of them don’t work, the inflatable kayak will help passengers safely return to land.To solve long-standing problems in the kayak industry — from lack of durability to overall insufficient performance — the company applied a special metal processing technology to its product. The ITIWITX500 Kayak’s V-shaped bottom makes this product long-lasting and tough.
1. Whose safety is largely guaranteed by King Fisher Apex?A.The tester. | B.Researchers. |
C.Medical staff. | D.The COVID-19 infected. |
A.It is designed for people with poor eyesight. |
B.It can be a cure for adolescent myopia. |
C.Its control effect is mainly determined by viewing angles. |
D.It may keep teenagers from developing high myopia. |
A.Its air chambers. | B.Its V-shaped bottom. |
C.Its light weight. | D.Its portable feature. |
【推荐2】Imagine Hying over the city in an electric powered aircraft that has no pilot but can take you from point A to point B in minutes. Sounds like science fiction, right? Well, not anymore. China-based Ehang has become the world’s first company to receive official approval to fly passengers in its pilotless air taxis.
Ehang’s EH216-S air taxis are electric vertical (垂直的) takeoff and landing aircraft, also called eVToL for short. The air taris can carry up to wo passengers or about 270kg of goods. They can fly at speeds of up to 130kmb and distances of up to 28km. The air taris are controlled by a central command centre that monitor the light, routes and weather conditions.
Passengers can simply select their destination on a touchscreen inside the cabin and enjoy the ride without worrying about piloting the aircraft. The taxis do not require airports or runways. They can take off and land vertically from any flat surface.
The air taxis use electric power to reduce environmental harm caused by emissions. They can be fully charged in two hours and have bow nose levels. They also have backup batteries and emergency landing systems and parachutes in case anything goes wrong.
They could transform how we travel around big cities —imagine using them to avoid traffic jams, save time on the daily commute (通勤) to work or school, or get to places that are hard to reach by car or public transport. And beyond just moving people, the aircraft can be used for delivering goods, such as packages, medical supplies or food. During natural disasters such as bushfires or foods, air taxis could transport much-needed medical staff, equipment or medicines to the scene quickly and safely.
One big challenge will be gaining the trust of the public and convincing commuters they are safe while flying. To do this, Ehang will educate passengers about the benefits and risks of using its taxis while also addressing potential issues and concerns about noise levels, privacy and the environmental impact.
1. What do we know about EH216-S air taxis?A.They don’t make any noise. | B.They are environment-friendly. |
C.They are controlled by eVTOL. | D.They can carry 270kg of goods and two persons. |
A.A swimming pool. | B.An empty street. |
C.A crowded car park. | D.A woody valley. |
A.Where air taxis can work. | B.When air taxis function well. |
C.Why air taxis are needed. | D.How air taxis can be used. |
A.By providing a free tip for brave passengers. |
B.By rewarding the most reliable passengers. |
C.By explaining is taxis advantages and disadvantages. |
D.By stressing the importance of environmental protection. |
【推荐3】Don’t know how to take care of your plants? A little spider-like robot will go for the sunlight, run to shade, dance when it’s doing well and stomp (跺脚) when it needs to be watered.
It’s called the HEXA Plant, a six-legged machine created by Vincross, a technology company in Beijing, China.
The plant robot will go for sunlight when it needs sun, then will move around in order to absorb the sunlight on all sides. When it needs to cool off, it will look for shade. It also plays with humans and dances when it is happy, moving its legs up and down. But it gets “angry” when it’s thirsty by stomping around.
With six legs, the HEXA Plant can move anywhere. It’s nimble enough to go in any direction and around any objects in its path. It has a variety of “eyes”, including an infrared sensor (红外线传感器), a distance sensor and a 720p camera with night vision, which could be very handy if you want to send it out at night to check on any sudden noises. It has built-in WiFi as well as USB ports to expand its talents.
The inventor of the cute robot, Sun Tianqi, was inspired by a dead sunflower at a flower exhibition that had been sitting in the shade all day. That was when he had the idea for the walking plant robot. He wanted to allow plants to experience movement.
1. What can the HEXA Plant do?A.Sing and dance. | B.Drink water when it’s thirsty. |
C.Find a cool place when it feels hot. | D.Move the things in its path. |
A.Happy. | B.Smart. | C.Angry. | D.Lucky. |
A.A green plant. | B.A dead sunflower. | C.An intelligent robot. | D.A strange animal. |
A.In an advertisement. | B.In a novel. | C.In a science magazine. | D.In a storybook. |
【推荐1】“One person’s trash is another person’s treasure.” That’s a common expression, but the next time you throw something away, think about a twist on the old saying. What if your trash could become your own treasure? Many creative, thrifty, and environmentally minded people have come up with a way to make that happen. It’s called upcycling. Our world would be a better place if everyone would begin upcycling.
Upcycling is the practice of taking an unwanted item and turning it into something useful. For example, how about that pair of jeans with a hole in one knee? It could become a new pillow for your bedroom.
Upcycling is not the same as recycling. Upcycling is actually much better for the environment. Recycling takes an item made of glass, paper, metal, or plastic, breaks it down to its base material, and then uses that material to make another product. This requires a great deal of energy. On the other hand, when you choose to upcycle, the only energy you use is your own. And upcycling not only reduces the amount of trash that goes into our landfills, but it also protects natural resources, such as oil and gas. Recycling is good for the environment, but upcycling is even better.
Upcycling also makes a family’s budget stretch further. Of course, the idea of reusing items to save money is not new. During the Great Depression in the 1930s, many families lived on a tight budget. People had to use what they already had in order to meet their needs.
As responsible citizens, we should all be concerned with protecting our environment and budgeting our resources. Upcycling is a fun and creative way to help. The next time you go to toss something into the trash can, stop and think about what it could become. Chances are, there’s a brand-new item in your hand just waiting to be upcycled.
1. Why does the author mention an old saying in the first paragraph?A.To arise reader’s awareness of upcycling. |
B.To stress the importance of upcycling. |
C.To lead in the topic of upcycling. |
D.To show the idea of upcycling. |
A.An old ladder is transformed into a bookshelf. |
B.Old tin cans are transported to landfill. |
C.A broken wooden door is chopped up. |
D.Old cloth is made into a paper bed. |
A.Upcycling is much more creative. |
B.Recycling is much easier to achieve. |
C.Recycling is much more cost-saving. |
D.Upcycling is much more energy-efficient. |
A.Upcycling is popular at present. |
B.Upcycling is replacing recycling. |
C.Upcycling is worth recommending. |
D.Upcycling is a tradition in daily life. |
【推荐2】Last week the electricity in my flat went out.
So for me it was an early night,
How would we survive in a world without electricity? Our daily lives go around it. We wouldn’t be able to function.
A.Yet we know one day we will run out of it. |
B.Our over-use of electricity is a big problem. |
C.This left me in complete darkness the whole night. |
D.It is a real problem to cut down on the use of electricity. |
E.I know for sure I could cut down on my use of electricity. |
F.I couldn’t help but think, do we rely too much on electricity? |
G.I turn on the TV in the background even when Tm not watching it. |
【推荐3】McDonald’s customers are sharing their excitement over an eco-friendly change making its way to select US restaurants. McDonald’s eaters across the globe are used to collecting their burgers in paper wrapping, their fries in cardboard, and their drink in a plastic cup — even if they’re dining inside a McDonald’s restaurant. However, this may become a thing of the past. One American diner said there were reusable containers available at their local McDonald’s for dine-in meals only.
Plastic containers and cups have an environmental cost: Plastics are made using fossil fuels like oil and natural gas. And when these materials are heated to mould (浇铸) plastic, poisons are again released into the air.
According to the World Wide Fund for Nature, about 100 million tons of plastics are produced on an annual basis — releasing an estimated 850 million tons of greenhouse gases into the atmosphere. “Generally, when those plastics go to landfill, they take hundreds of years to break down and slowly release substances into the environment,” Dr. Thornton said.
It is reported in the industry research that about 27 percent of customers at fast food establishments eat at the restaurant. This means McDonald’s could potentially remove a quarter of its packaging waste through a reusable container system. “If you’re comparing the single-use with the reusable, the reusable take a lot more combined in terms of resources, and energy and water and so on. If you use them a sufficient number of times, that’s when they start to become better environmentally.”
Currently, most of the fast-food outlets use paper containers. But in order to truly be sustainable(可持续的), Dr. Thornton said these items should be made of recycled materials — and only distributed to customers on a need-to-use basis. “Don’t use new resources. That’s probably one of the most important things to say,” he said. “Close the loop in terms of recycling, and make sure that they only provide packaging or the amount of packaging as needed.”
1. What is the eco-friendly change in some of the US McDonald’s?A.Recycled plastic cups for drinks. |
B.Cardboard packagings for fries. |
C.Reusable containers for dine-in meals. |
D.Selected paper wrappings for burgers. |
A.25%. | B.50%. | C.75%. | D.100%. |
A.Use paper containers for dine-in meals. |
B.Reduce the food waste in their establishments. |
C.Make reusable containers out of new materials. |
D.Provide necessary recycled packaging to customers. |
A.The impact of McDonald’s on the environment. |
B.The cost of plastic containers and cups in McDonald’s. |
C.The disadvantage of plastic packaging in fast-food establishments. |
D.The significance of sustainable practices in the fast-food industry. |
【推荐1】Body awareness(身体意识) helps children understand how they can move their bodies and the concept of space and how it relates to their bodies.
There are many fun games and songs that teach children body awareness and encourage them to move their bodies.
“Simon Says” is a great example, as long as you allow all children to continue to play instead of removing children who do not follow the directions correctly. Children who do not follow the directions correctly are generally the very ones who need to play the game most.
Remember the game called “Statue”, or maybe you called it “Freeze”? The teacher plays music; and when the music stops, the children “freeze”. To add an element of learning about body parts, add this instruction: “If I call ‘Hands’, everyone should be frozen except for their hands, which should be moving.” Children love this change of the game, and it teaches them to listen and learn body parts.
Another classic song that teaches body awareness is “If You're Happy and You Know It”. Although the standard refrains(副歌) tell you to “clap your hands” and “stomp your feet”, you can try to “wiggle(摆动) your fingers”, “pull your ears”, “shake your head”, etc.
Children enjoy guessing games. Try giving clues(提示) about which body part you are describing. For example, “I am thinking about a body part that I smell with. It is right under my eyes and right over my mouth. What am I thinking about?” To help thinking and language skills, encourage children to make up the clues for a body part.
Children should enter school with a basic understanding of their bodies. Childcare programs can promote this understanding.
1. How many kinds of games are mentioned in the passage?A.3. | B.4. |
C.5. | D.6. |
A.always stupid | B.always clever |
C.of good body awareness | D.lacking in body awareness |
A.Listening to songs. | B.Guessing games. |
C.Simon says. | D.Statue or Freeze. |
A.To show the importance of body awareness for children. |
B.To tell us the best game for children's body awareness. |
C.To tell us how to help children learn before going to school. |
D.To introduce activities that are good for children's body awareness. |
【推荐2】The era of intelligent home is on the way... A smart pet-flap based on lift door technology that lets pets in — but keeps foxes out —has been made public at the world’s largest tech conference. The MyQ Pet Portal is the latest tool to promise to revolutionise petkeeping.
For $2,999 owners get a new door featuring sliding doors that are unnoticeable when closed. The family pet is equipped with a Bluetooth collar that sends a signal to the sensor hidden in the door which then informs the owner.
A smart phone app allows the owner to choose whether to open the door, with a video and audio stream (音频流) enabling the owner to see and talk to their pet. “ It is a solution for homeowners who want to keep the security and the appearance of their home in good condition while providing their pets with the freedom to play on demand,” the company claims. MyQ is owned by Chamberlain Group, a US company specialising in garage doors.
The door comes with an “auto-close and lock system” that triggers after the dog goes through to ensure that no other pets or foxes can use it. There is also the option to let a dog open the door automatically when it approaches, without the need for the owners’ approval.
Samsung revealed a robot called Bot Handy that can, it is claimed, pick up laundry, load the dishwasher, set the table, pour wine, and fetch drinks. There was also an app or voice-controlled bathtub from Kohler, a US maker of bathroom products, which attempts to make the spa experience at home possible. The tub, costing up to $8,700, can connect to voice assistants such as Alexa that will tell it to run the water, adjust the temperature or release scents.
1. What is the MyQ Pet Portal based on?A.The bluetooth technology. |
B.The lift door technology. |
C.The latest robot technology. |
D.The voice-controlled technology. |
A.By pushing the door itself. |
B.With a sensor in the collar. |
C.By sending a signal to its owner. |
D.With the auto-close and lock system. |
A.By comparing data. |
B.By analyzing the reasons. |
C.By giving typical examples. |
D.By presenting various ideas. |
A.The revolution of keeping pets. |
B.The advertisement for sliding doors. |
C.The application and promotion of a smart app. |
D.The introduction to home intelligent products. |
【推荐3】For many Chinese consumers, a satisfying breakfast is one that includes either hot porridge or steamed buns (馒头). Cold sandwiches, which are popular with Westerners, are probably one of the last options on their minds. But that is not to say that consumers, especially those in an international city like Shanghai, would avoid everything considered Western for breakfast. For instance, coffee, which has steadily grown in popularity in the country, is one drink that many cannot do without today.
To satisfy this growing demand for breakfast sets that combine elements from the East and the West, food companies have been rolling out (推出) a host of new offerings to attract the customer. One example is Shanghai Qiao Coffee, launched by local time-honored food company Qiaojiashan at the end of 2019. Apart from its traditional dim sum (点心), the store also sells various types of coffee.
According to Shen Yan, deputy manager of Qiaojiashan, the most popular breakfast set now is the steamed vegetable bun paired with black coffee. “The calories that one gets from a meal consisting of Chinese dim sum and coffee are less than those of a Western breakfast. Since a steamed bun has nearly 200 calories and a cup of black coffee barely has any calories, this combination can be considered healthy and delicious,” said Shen.
Even the smaller shoppers in the food scene are jumping on the East-West breakfast trend. Western food companies, too, have been rolling out Chinese breakfast options. “Consumers and even cultural heritage will also benefit from the increased competition. If not for the current trend which has revived interest in certain traditional dim sum, these foods could soon be lost to history,” Shen said.
1. What can we learn about breakfast in Shanghai in Paragraph 1?A.Coffee is a must for many people. |
B.Cold sandwiches are a popular choice. |
C.People avoid western food for breakfast. |
D.People prefer porridge and steamed buns. |
A.Because it’s traditional. |
B.Because it’s tasty and healthy. |
C.Because it’s newly created. |
D.Because it contains more vegetables. |
A.Western food companies dislike East-West breakfast. |
B.Big companies have the ability to seize the market share. |
C.The competition for breakfast sets is of no benefit to consumers. |
D.Some traditional foods may disappear without the combination trend. |
A.Chinese consumers show more interest in western food. |
B.Western breakfast is warmly welcomed by Shanghai people. |
C.The Chinese-Western breakfast set is becoming a hit in Shanghai. |
D.Shanghai Qiao Coffee has won great success for its breakfast sets. |