Microplastics (微塑料) pollute drinking water. Data now suggest all of us have microplastics in our bodies. Some plastics are harmful.
Menake Piyasena, a professor at the New Mexico Institute of Mining and Technology, and his team worked on a new process. In the past, Piyasena used ultrasound (超声波) to separate microbes and other cells from water. He recalls thinking: “What if we can use the same method to concentrate on microplastics?”
The researchers send polluted water down a tube. The tube’s water flows past a transducer, which turns electrical energy into sound energy. It makes ultrasound waves that travel from one side of the tube to the other. When they hit microplastics, these waves exert(施加)a force on the plastic bits.
What happens next depends on the size of those plastic bits. Ones less than about 180micrometers across will move to the center of the flow. Larger ones will interact with each other and create an additional force. This sends those larger ones toward the other end of flowing water.
The ultrasound treatment removed about four in every five plastic bits from the water. It took about 90 minutes to clean one liter. It cost only about 10 cents to do that. “We think our approach will be cost-effective and simple,” Piyasena says.
“Microplastics are a problem worldwide,” says a research chemist Souhail Al-Abed, who works for the US Environmental Protection Agency. In his opinion, this tech is not yet ready to be rolled out for widespread use. “I’d like to express praise for Piyasena’s team that are conducting this research,” Al-Abed adds. “Research does not have all the answers on day 1 or day 2 or day 100. But continuing work by these researchers may find a good solution for the future.”
1. Why did the researchers turn to ultrasound in the new study?A.They proved it was harmless to humans. |
B.They managed to apply it to other studies. |
C.It produced enough energy to heat water. |
D.It enabled them to focus on the experiment. |
A.It might waste plenty of water. |
B.It will serve every family soon. |
C.It could lead to safer drinking water. |
D.It has been the most effective approach. |
A.Hopeless. | B.Unclear. | C.Concerned. | D.Positive. |
A.Ultrasound Helps Remove Microplastics in Water |
B.Scientists Have Found the Cause of Water Pollution |
C.Efforts Are Made to Turn Microplastics into Energy |
D.Plastics Have a Bad Influence on Our Everyday Life |
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【推荐1】Wherever we go, we are surrounded by history. Across the globe, cultural heritage is passed down through the generations. It is in the buildings and structures around us. It is in the arts and artifacts (手工艺品) we treasure. It lives in the languages we speak and the stories we tell. But today, it is under attack as never before. Not only are the damages of time threatening our cultural heritage, but conflicts, climate change, globalization and tourism are all exacting a heavy price. Technology is now the most essential weapon in the battle. Here’s how technology is preserving our cultural heritage.
As you can imagine, creating the replicas (复制品) via crowd sourced 2D images is extremely time-consuming. Increasingly, artificial intelligence (AI) algorithms (算法) are being used to do all the required sourcing, allowing millions of images to be stored in a matter of hours. AI will also make restoration and preservation of existing cultural heritage far easier and vastly superior to previous methods.
Virtual reality (VR) technology will play a leading role in preserving our cultural heritage in the coming years. Many of the most important sites and architecture are extremely fragile. Human interaction with these locations is doing a great deal of harm. Wastes accumulate everywhere, causing enormous problems. As more cultural heritage sites and objects are digitally mapped and recorded, VR technology will increasingly become the way that people experience them. We’ll all eventually be able to walk through places, look at (and touch!) artifacts and works of art without ever seeing them with our own eyes.
Finally, our cultural heritage will be preserved via technology. Efforts in research, innovation, data sharing and project work will help promote and preserve the cultural heritage of countries all across the world.
1. What does the underlined word “exacting” in paragraph 1 mean?A.Paying. | B.Cutting. | C.Receiving. | D.Demanding. |
A.It generates 2D images. | B.It makes restoration easier. |
C.It makes preservation safer. | D.It creates replicas in seconds. |
A.By recycling huge amounts of waste. | B.By reducing human impact on the site. |
C.By forbidding visitors from touching artifacts. | D.By educating people about the sites’ importance. |
A.Ignoring. | B.Compromising. | C.Approving. | D.Disagreeing. |
【推荐2】Imagine being able to go to your local park and pick some tomatoes, potatoes or even bananas to take home for dinner. Sounds too good to be true, right? For residents of Andernach, a German city, it’s not just a Utopian dream — it’s their reality. In 2010, Andernach began its “edible city” project, planting 101 varieties of tomatoes in public green spaces around the city centre. Its 30,000 residents are free to help themselves to whatever grows, as are any other visitors. Every year a new type of plant is introduced. In 2011, 100 types of beans were planted, while 2012 saw the introduction of 20 onion varieties. The town’s motto (座右铭) is, “Picking is encouraged — help yourself!”
It’s a community effort, as local citizens are encouraged to help plant and maintain the gardens. This offers an opportunity to socialize as well as to learn about planting, cultivating and harvesting food. “I often drop by to pick some herbs that I’m missing at home. Everything is easily accessible. There aren’t any fences. You just take what you need. The only thing is you have to be quick once the fruits are ripe or they’ll all be gone!” said a local historian.
Andernach may be the first, but it isn’t the only edible city. It’s part of the Edible Cities Network, an EU-funded project connecting green urban food initiatives (倡议) around the world. Other edible cities include Carthage in Tunisia, Havana in Cuba and Šempeter-Vrtojba in Slovenia. In February 2022, the first Edible Cities Network Conference took place. Dr. Ina Säumel, Principal Investigator of the Edible Cities Network, called it, “a unique opportunity to invite researchers and practitioners (从业人员) of Edible City Solutions to the same table and unite theory with practice”.
Ultimately, the Edible Cities Network aims to create “greener, more edible and, above all, more livable cities”. It is a response to the pressures of climate change, and a cause for hope.
1. What is paragraph 1 mainly about?A.The process of Andernach’s growth. |
B.The green food project in Andernach. |
C.Methods of planting vegetables in Europe. |
D.The popularity of Andernach’s city design. |
A.Doubtful. | B.Indifferent. |
C.Positive. | D.Negative. |
A.Green urban food has drawn more attention. |
B.German rural areas will follow the trend too. |
C.Asia will join the Edible Cities Network soon. |
D.Edible cities hold meetings on a regular base. |
A.Start a Green Food Campaign Now |
B.Gain Easy Access to German Food |
C.Quick Response to Climate Change |
D.An Incredible “Edible City” Initiative |
【推荐3】Your Internet experience is terrible when the net speed is too slow—it takes so long to open a web page and the film you’re watching stops every few minutes. That can be very annoying. But it could be a thing of the past. In the near future, major telecom carriers will start to provide 5G services.
What is 5G? What difference will it really make to our lives? The “G” in “5G” refers to the generations of mobile network technologies.
1G let us talk to each other, 2G let us send messages, 3G gave us mobile data and the Internet, and 4G made all of these things faster. Now 5G promises much faster data download and upload speeds, and more stable connections. This means that you will be able to download an entire HD movie in seconds and only experience a short delay between sending and receiving data. For example, when you have a video chat with your friend, there is generally a 200 milliseconds delay with 4G, but 5G will reduce the delay to 1 millisecond, which is almost real time.
5G will be able to improve many advanced technologies, such as driverless cars, wearable devices and entertainment. With a 5G network, the short delay in information exchange will allow driverless cars to run more safely, as they will be able to communicate in real time and avoid dangers. Meanwhile, 5G-enabled wearable devices will keep doctors updated on the health status of their patients, so doctors can give patients advice immediately if there’s something wrong. Besides, VR games will become more popular with 5G.The short delay of 5G will make the games feel even more real.
Though 5G will make our lives more convenient, it will not be perfect. For one thing, 5G will not “travel” far. On 4G networks, you can be 10 kilometres away from the nearest transmission base and barely lose signals. But 5G will only cover about 300 metres, meaning that we will need more transmitters so that we can get signals. And in order to use 5G, we will have to buy new products specifically designed for 5G that are currently expensive.
1. What does the “G” in “5G” refer to?A.Games. | B.Groups. | C.Grades. | D.Generations. |
A.How much does 5G cost in real time. | B.Why will 5G reduce the delay. |
C.How will 5G improve the driverless cars. | D.What changes will 5G bring us? |
A.3G gave us mobile data and the Internet. |
B.5G will allow driverless cars to run more safely. |
C.5G will cover about 300 metres to 1,000 metres. |
D.5G will make the VR games feel even more real. |
A.A diary. | B.A magazine. | C.A storybook. | D.A novel. |
【推荐1】What kind of dinosaur are you? If you answered Tyrannosaurus rex, then the bad news is that you probably won’t get the job you’re applying for.
Welcome to the strange world of extreme interviewing, the latest trend in which interviewers throw bizarre questions at candidates to see how they react.
It may seem like a game, but extreme interviewing is deadly serious. The idea is to see how quickly job seekers think on their feet and, at a time when 25 percent of recent graduates are unemployed, it offers employers a new way of separating the brilliant candidates from the merely very good.
This new approach to selecting candidates comes from Silicon Valley in California. One of the early pioneers of extreme interviewing was Steve Jobs, co-founder of Apple, who could be famously cruel with job seekers. Faced once with a candidate he considered boring, Jobs suddenly pretended to be a chicken, flapping his arms and making clucking noises around the unfortunate applicant, waiting to see what he would do. In fact, the secret to extreme interviewing is neither in the question nor the answer. It is in the candidate’s reaction.
David Moyle, a headhunter with the recruitment agency Eximius Group, who admits to using the dinosaur question selecting candidates, said: “Essentially, that kind of interviewing is used by us to give someone an opportunity to show they are smart.”
“Most candidates actually get something out of it, it’s not about trying to crush them. We are trying to give them an opportunity to show their personality, rather than just showing how they perform in an interview.”
Of course, getting the job is just the start. In the modern business world, survival will depend on what kind of dinosaur you really are.
1. The word “bizarre” in paragraph 2 is closet in meaning to ______.A.common | B.unusual | C.instinctive | D.dishonest |
A.They can attract more graduates to apply in this way. |
B.They can learn to answer job seekers properly in this way. |
C.They can find the most outstanding applicants in this way. |
D.They can avoid being cruel to the interviewees in this way. |
A.Their past experience. | B.Their job performance. |
C.Their interview skills. | D.Their real personality. |
【推荐2】Specialists(专家)say it is not easy to get used to life in a new culture. “Culture shock” is what these specialists use when talking about the feelings that people have in a new environment. The specialists say that there are three stages of culture shock. In the first stage, the newcomers like their new environment. Then, when the fresh experience dies, they begin to hate the city, the country, the people, and everything else. In the last stage, the newcomers begin to get used to their surroundings and, as a result, enjoy their life more.
There are some evident factors(因素)in culture shock. The weather may be unpleasant. The customs may be different. The public service systems—the telephones, post office, or transportation—may be difficult to work out. The simplest things seem to be the biggest problems. The language may be difficult.
Who feels culture shock? Everyone does in this way or that. But culture shock surprises most people. Very often the people having the worst culture shock are those who never had any difficulties in their own country. Coming to a new country, these people find they do not have the same positions as they have back home. They find themselves without any identify. They have to build a new self-image.
Culture shock gives rise to (使发生)a feeling of helplessness. This feeling may be homesickness. When homesick, people feel like staying inside all the time. They want to protect themselves from the strange environment, and create an escape inside their room for a sense of security (安全). This escape does solve the problem of culture shock for a short time, but it does nothing to make the person familiar with the culture. Getting to know the new environment and gaining experience—these are the long-term solutions to the problem of culture shock.
1. When people move to a new country, they_______.A.will get used to their new surroundings with difficulty |
B.have well prepared for the new surroundings |
C.will get used to the culture of the country quickly |
D.will never be familiar with the culture of the country |
A.the language communication | B.the weather conditions and customs |
C.the public service systems | D.the homesickness |
A.the fewer difficulties you may have abroad | B.the more difficulties you may have abroad |
C.the more money you will earn abroad | D.the less homesick you may feel abroad |
A.protect ourselves from unfamiliar environment | B.develop a strange sense of self-protection |
C.get familiar with new culture | D.return to our own country |
【推荐3】It’s not easy being a teenager-nor is it easy being the parent of a teenager. You can make your child feel angry, hurt, or misunderstood by what you say without realizing it yourself. It is important to give your child the space he needs to grow while gently letting him know that you you’ll still be there for him when he needs you.
Expect a lot from your child, just not everything. Except for health and safety problems, such as drug use or careless driving, consider everything else open to discussion. If your child is unwilling to discuss something, don’t insist he tell you what’s on his mind. The more you insist, the more likely that he’ll clam up. Instead, let him attempt to solve things by himself. At the same time, remind him that you’re always there for him should he seek advice or help. Show respect for your teenager’s privacy (隐私). Never read his mail or listen in on personal conversions.
Teach your teenager that the family phone is for the whole family. If your child talks on the family’s telephone for too long, tell him he can talk for 15 minutes, but then he must stay off the phone for at least an equal period of time. This not only frees up the line so that other family members can make and receive calls, but teaches your teenager moderation(节制). Or if you are open to the idea, allow your teenager his own phone that he pays for with his own pocket money or a part-time job.
1. The main purpose of the text is to tell parents _______.A.how to play with a teenager |
B.how to help a teenager grow up |
C.how to understand a teenager |
D.how to respect a teenager |
A.become excited | B.show respect |
C.refuse to talk | D.seek help |
A.to use the phone in a sensible way |
B.to pay for his own telephone |
C.to share the phone quickly |
D.to answer the phone quickly |
A.Not allow him to learn driving or take drugs. |
B.Not talk about personal things with him. |
C.Give him advice only when necessary. |
D.Let him have his own telephone. |