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题型:阅读理解-阅读单选 难度:0.65 引用次数:30 题号:21809379

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.
2. What can we infer about the water treatment?
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.
3. What is Al-Abed’s attitude to Piyasena’s research?
A.Hopeless.B.Unclear.C.Concerned.D.Positive.
4. Which is the most suitable title for the text?
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
【知识点】 科学技术 说明文

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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.
2. What is the advantage of AI in preserving cultural heritage?
A.It generates 2D images.B.It makes restoration easier.
C.It makes preservation safer.D.It creates replicas in seconds.
3. How does VR help to preserve cultural heritage?
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.
4. What is the author’s attitude towards technology application in preserving the cultural heritage?
A.Ignoring.B.Compromising.C.Approving.D.Disagreeing.
2022-04-21更新 | 243次组卷
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【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.

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4. Which of the following could be the best title for the text?
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
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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.

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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.
4. Where is the article possibly from?
A.A diary.B.A magazine.C.A storybook.D.A novel.
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