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题型:阅读理解-阅读单选 难度:0.65 引用次数:84 题号:17832803

More than a third of the world’s population lives in drylands, areas that experience significant water shortages. Engineers and scientists at the University of Texas at Austin have developed a unique solution to help people in these areas access clean drinking water.

They developed a low-cost gel film (凝胶膜) that can pull water from the air in even the driest climate. Combining two simple ingredients, cellulose and konjac gum, the gel is inexpensive to produce. Just one kilogram of gel can absorb up to six liters of water in a dry climate. For those living in a climate with relative humidity, one kilogram of gel can collect up to13 liters of water a day. As the gel is so inexpensive and easy to make, it may offer a way of providing drinking water to countries with water shortages.

Previously, researchers have harvested fresh water from fog and dew, but that only serves areas with high humidity. Other attempts at pulling water from desert air are typically energy-intensive and do not produce much. In fact, this gel is a vast improvement from previous water harvesting technologies. The maximum water harvested has been 5. 87 liters in places with relative humidity. This new gel doubles this amount, uses no energy and is simple to operate and it can be molded into a shape or size that best suits the user.

“This new work is about practical solutions that people can use to get water in the hottest, driest places on Earth,” said Guihua Yu, professor at the Cockrell School of Engineering. “This could allow millions of people without consistent access to drinking water to have simple, water generating devices at home that they can easily operate.”

“This is not something you need an advanced degree to use,” the paper’s lead author, Youhong “Nancy” Guo said. “It’s straightforward enough that anyone can make it at home if they have the materials.” Scientists are planning on making a thicker gel that will increase the yield, making this technology a practicable solution to drought.

1. What do we know about the gel film from paragraph 2?
A.It can increase the humidity of the air.
B.It can harvest drinking water from the air.
C.It has been widely applied in desert areas.
D.It costs lots of money and energy to produce.
2. What is Guihua Yu’s attitude towards the new water-harvesting method?
A.Indifferent.B.Skeptical.C.Unfavourable.D.Hopeful.
3. What does the underlined word straightforward in paragraph 5 mean?
A.Plain.B.Obvious.C.Tough.D.Direct.
4. What will scientists intend to do next?
A.Develop a thicker gel.
B.Produce the gel on a large scale.
C.Raise money for further research.
D.Teach people to make the gel at home.

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【推荐1】A UK supermarket has become the first in the world to let shoppers pay using just the veins (纹理)in their fingertips. Customers at the Costcutter Store, at Brunel University in London, can now pay using their unique vein pattern to identify themselves.

The firm behind the technology, Sthaler, has said it is in "serious talks" with other major UK supermarkets to adopt hi-tech finger vein scanners at pay points across thousands of stores. It works by using infrared(红外线)to scan people's finger veins and then links this unique biometric map to their bank cards. Customers' bank details are then stored with payment provider Worldpay and in the same way you can store your card details when shopping online. Shoppers can then turn up to the supermarket with nothing on them but their own hands and use them to make payments in just three seconds.

Previous studies have found fingerprint recognition, used widely on mobile phones, is likely to be hacked and can be copied even from fingerprint left on phone screens. But Sthaler claims vein technology is the most secure biometric identification method as it cannot be copied or stolen. The technology uses an infrared light to create a detailed map of the vein pattern in your finger. It requires the person to be alive, meaning in the unlikely event a criminal hacks(非法侵入)off someone's finger, it would not work.

Sthaler said it takes just one minute to sign up to the system firstly and, after that, it takes just seconds to place your finger in a scanner each time you reach the supermarket checkout. Simon Binns, commercial director of Sthaler, told the Daily Telegraph, ''This makes payments so much easier for customers. There are no known occurrences where this security has been broken. ''

1. Which supermarket in the world can now use the vein-recognition technology?
A.Grocery stores in London.
B.Thousands of stores in the UK.
C.University supermarkets in the UK.
D.Costcutter Store at Brunel University in London.
2. What message does Sthaler intend to convey according to Paragraph 3?
A.The system is safe.B.Hacker attacks are unlikely.
C.Vein patterns can be copied.D.The technology is convenient.
3. What should customers do before using the system?
A.Copy the fingerprint.B.Protect against hacking.
C.Contact the supermarket.D.Register on the system.
4. What do we know about the vein-recognition system?
A.It has been hacked.
B.It will be adopted by more shops.
C.Its company is optimistic about it.
D.Its technology needs further improvement.
2020-07-10更新 | 30次组卷
阅读理解-阅读单选(约320词) | 适中 (0.65)
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【推荐2】Stroke(中风) survivors often struggle with manipulating objects. They lose the sensation (知觉) in their hands and fingers, which is the usual impairment(损伤) they experience daily. This condition affects their activities and lowers the quality of their lives to an extent. As a solution to this problem, a group of scientists from the UK’s University of Hertfordshire has developed a special touchpad that can allow them to feel once again.

In an article by E&T, the University of Hertfordshire researchers have created a unique invention that can bring back the sense of touch among stroke survivors. This particular device is capable of sending tiny vibrations(振动) to the patient’s fingertips. This will give life to the brain cells so they can function once again and restore the sensation of the limbs.

If the survivor wears this device, they could now normally function as before. They can do tasks on their own without asking for help from other people. “Improvement in touch sensation should lead to them being able to sense that they are holding hands. That definitely should be possible,” Dr. Am it Pujari, the inventor of the device, said.

During the British Science Festival, the device developer urged the participants to tell if they had sensations on their hands while the tool was placed. The trial lasted for 10 minutes. The researchers found that 20 to 40%of them have shown an improved sensation in their limbs.

Besides enhancing the patient's movements, the test proved that it could also be a huge help in improving a patient's mental well-being. The study is expected to undergo a peer review in the future. The experts are still wondering about the device's impact in the long run. They also want to tackle how effective it is for patients who suffer from stroke.

1. What’s the function of the special touchpad?
A.Increasing stroke survivors' brain cells.
B.Changing the way stroke survivors seize objects.
C.Helping stroke survivors regain the sense of touch.
D.Monitoring the life quality of stroke survivors.
2. What does “That” in paragraph 3 refer to?
A.Preventing stroke.B.Restoring the sensation of hands.
C.Turning to others for help.D.Wearing the special device.
3. What can we learn about the special device?
A.It has undergone a peer review.
B.It cures stroke immediately.
C.It helps improve patients' mental health.
D.It has produced long-term impact on patients.
4. What can be inferred about the outcome of the 10-minute trial?
A.It’s negative.B.It’s typical.
C.It’s encouraging.D.It’s disappointing.
2023-04-26更新 | 80次组卷
阅读理解-阅读单选(约280词) | 适中 (0.65)

【推荐3】Lions are the top tourist attraction to Kenya and also considered critically endangered. One of the main causes of their death is that people kill them in return for lions attacking their cows. “We put our cows in a small cow shelter at night,” locals said, “and that’s when the trouble would start. Lions would jump in the shelter and kill the cows”.

There have been a lot of efforts to try to protect the lions, but it’s a crisis and everyone is looking for a solution. One idea was land leases(租用), another was lion-proof fences. However, no one even knew that Richard Turere, a 13-year-old Maasai from Kenya, had already come up with something that worked.

One night Richard was walking around with a flashlight and discovered the lions were scared of a moving light. An idea was born. Three weeks and much repairing later, Richard invented a system of lights that flash around the cow shelter, mimicking a human walking around with a flashlight. His system is made from broken flashlight parts and an indicator box from a motorcycle. “The only thing I bought was a solar panel(电池板), which charges a battery that supplies power to the lights at night.” Richard says. He calls the system Lion Lights.

His simple solution was so successful: his neighbors heard about it and wanted Lion Lights, too. He put in the lights for them. From there, the lights spread and are now being used all around Kenya. Someone in India is trying them out for tigers. In Zambia and Tanzania they’re being used as well.

1. Why do local people kill lions?
A.To attract tourists.B.To protect their cows.
C.To sell them for money.D.To scare away large animals.
2. What makes Richard’s idea successful?
A.That the lights will cost nothing.
B.That the system can protect lions.
C.That the lions are afraid of light.
D.That the cows are lawfully killed.
3. What may be the best title of the text?
A.Lion LightsB.Protecting Lions
C.Endangered CowsD.Lion-proof Fences
2018-06-27更新 | 69次组卷
共计 平均难度:一般