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题型:阅读理解-阅读单选 难度:0.65 引用次数:149 题号:9201405

Engineers in Upstate New York have invented a folded paper device that looks like a decorated art project. But don't be fooled. This is actually a paper-based battery. No, it doesn't look like any of those metal batteries running flashlights or smartphones. In these systems, the battery can be printed on a page. The battery 's power consists of living bacteria.

Paper electronics are simple to make and inexpensive, notes study leader Seokheun Choi, an engineer at Binghamton University. They need no electrical outlet to recharge. They just need more bacteria, which can be found everywhere — including dirty water.

“ Most batteries use chemicals to generate electricity. Substituting bacteria can be an advantage,” Choi says.“They are cheap and self-repairing.” What paper-based batteries won't do is generate much power. They do, however create enough to run small devices in faraway or dangerous places — such as a battlefield . They might also find use in medicine . For instance, they might power tiny sensors, such as the types used to measure blood sugar.

This invention is based on an observation made more than a century ago — that microbes (微生 物) produce electricity as they digest food. Scientists refer to the bio-batteries based on this principle as microbial fuel cells. A fuel cell generates electricity like a regular battery. But a regular battery stops producing electricity when its inner chemical reactions stop. A fuel cell uses fuel that can be refilled. In this case, bacteria serve as the fuel. By refilling more microbes, as needed, scientists can keep these fuel cells running.

Lab tests have shown that the new battery can produce a current. Now, Choi and his team are looking at ways to increase the power. They're studying different shapes and materials for the anode and cathode (正负 极). They're also looking for the best ways to combine batteries for more power. The beauty of the paper devices is that you can simply fold them to connect them. And they surely will be a trend in the near future.

1. What makes the paper-based batteries different from other batteries?
A.They are mainly used to run smartphones.
B.They use bacteria to generate electricity.
C.They are used to decorate small devices.
D.They take a much shorter time to recharge.
2. What can the paper-based batteries do?
A.Power tiny devices.B.Lower blood sugar levels.
C.Produce much electricity.D.Change chemicals in the paper.
3. What is the fourth paragraph mainly about?
A.The application of the new battery.
B.The characteristics of the paper batteries.
C.The intention to invent the device.
D.The working principle of the invention.
4. What is the author's attitude towards the development of the paper-based batteries?
A.Defensive.B.Optimistic.
C.Doubtful.D.Ambiguous.

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【推荐1】Loud cheers and applause broke out at NASA’s Jet Propulsion Lab on Monday, November 25, 2018, as the unmanned lander, called Insight, touched down on Mars, after nearly seven

years from design to launch to landing.

The great arrival of the spacecraft—designed to listen for quakes and shakes as a way to discover the Red Planet’s inner secrets, how it formed billions of years ago and, how other planets like Earth took shape—marked the eighth successful landing on Mars in Nasa’s history.

Minutes after InSight landed on the surface of Mars, the first image was sent back, showing a wide flat area as seen through a dirty camera.

The touchdown came after a nearly seven-month, 300 million-mile travel from Earth to Mars, during which the InSight spacecraft had to slow down from a speed of more than 12,000 mph. The spacecraft’s heat shelter helped the lander survive temperatures as high as 2,700℉.

Each step along the way was watched nervously at JPL, with updates delayed by the eight-minute light travel time between Earth and Mars. Mission controllers hugged each other with joy when the signals were received. “We are proud of everything that has gone on today,” they told us reporters.

The first picture of the surface of Mars was sent back to Earth by one of the MarCO nanosatellites (马可纳米卫星) that accompanied InSight during its travel to Mars. The dust from the landing made the view unclear. Pictures from it were expected to be clearer once the dust settled and the lens cover (镜头盖) was removed.

Hours later, InSight’s batteries were charging as expected. The InSight team also passed on another picture, taken by a different camera that’s fixed on the lander’s robotic arm. The view is clearer, showing the robotic arm and the seismometer, which is used to discover the actual movement of the ground.

1. What do we know about InSight lander from the passage?
A.It has landed successfully on Mars eight times.
B.It travelled all the way at the speed of 12,000 mph.
C.Mission controllers helped it survive high temperature.
D.The task of it is to find out the inner mysteries of Mars.
2. We know what Mars looks like by _______.
A.studying pictures InSight lander sends back
B.reading reports sent back by the person on Mars
C.collecting images sent back by MarCO nanosatellites
D.analyzing information the robot on InSight lander sends back
3. How did the mission controllers feel when they received signals from Insight?
A.Unconcerned.B.Worried.
C.Amazed.D.Excited.
4. The passage is most probably taken from _______.
A.a fiction novelB.a news report
C.a travel magazineD.an official statement
2020-03-22更新 | 121次组卷
阅读理解-阅读单选(约320词) | 适中 (0.65)
文章大意:这是一篇说明文,文章介绍了一种利用海洋自然发生的温度差异为海洋机器人提供动力的方法。以及电源模块的工作原理及突破。

【推荐2】For centuries, humans have explored the Earth’s mountains, jungles and deserts. But despite covering more than 70% of the Earth’s surface, the ocean is still a relative mystery. In fact, just over 20% of the ocean bed has been mapped. Getting a fuller picture would enable us to guide ships more safely, build wind-farms and protect ocean species—all part of what’s known as the “blue economy”, projected to be worth $3 trilling by 2030.

Underwater robotic vehicles are helping gather that data quicker and more cheaply than ever before. But many of these vehicles depend on batteries which need to return to a boat or the shore to recharge, making it difficult to map more remote (遥远的) parts of the sea.

A startup called Seatrec is rising to the challenge, founded by oceanographer Yi Chao. Yi Chao developed technology to power ocean robots by taking advantage of “the naturally temperature difference” between colder and warmer parts of the sea, which in turn creates energy and powers the robot’s generator (发电机). They get charged by the sea, so their lifetime will be almost limitless,” Chao said.

The power module (组件) can be fixed on existing data-gathering robots which dive a kilometer down to examine the chemistry and shape of the seabed, creating a map of the surrounding area. The robot returns to the surface to send back its findings via satellite. A basic power module costs as much as $20,000. But the access to free, renewable energy and the ability to stay in the water longer make data gathering up to five times cheaper in the long run.

Started in 2017, the Seabed 2030 Project has increased awareness about the importance of the ocean floor and given researchers and companies a clear goal to work towards: map the entire seafloor by the end of this decade.

1. What’s the purpose of the first paragraph?
A.To uncover the mystery of the ocean.
B.To introduce the idea of “blue economy”.
C.To stress the importance of seabed mapping.
D.To explain the difficulty of exploring the sea.
2. What’s the disadvantage of the previous underwater robotic vehicle?
A.Its work efficiency is low.B.It needs a land power station.
C.It has a data gathering problem.D.Its battery limits the mapping area.
3. What do we know about Seatrec product?
A.It is a new kind of ocean robot.B.It adds cost to seabed mapping.
C.It sends mapping data via satellite.D.It applies energy-renewable technology.
4. What does this text mainly talk about?
A.Ocean robots mapping further.B.A project of exploring the ocean.
C.A new way to protect the ocean bed.D.Underwater batteries becoming powerful.
2023-07-09更新 | 33次组卷
阅读理解-阅读单选(约260词) | 适中 (0.65)

【推荐3】Animals can be reproduced by technology now; researchers can clone them. A clone is an exact copy of another animal or plant. Scientists have cloned a sheep which they have named Dolly. Researchers took genes from a ewe (母羊) and used them to create a copy (Dolly) of the ewe.

Why are scientists doing this research? One reason is to get information about genes so they can improve our health. They also want to learn how better farm animals can be produced. Cloning is a controversial issue for people. Some people think it is good because this research can help us, but other people think cloning is unacceptable. Some people think it might be possible to save endangered animals by cloning them. Tigers, elephants, and other endangered animals might be saved in this way.

In China, pandas are endangered because they are hunted and they are losing their habitat, so some Chinese scientists want to try to clone pandas to save them from extinction.

I don’t really like the idea of cloning animals, but I don’t think I want panda to become extinct. If the best way to save them is to make cloned pandas, they must be cloned.

I want to live with a lot of animals and nature. I don’t want animals to die out, especially pandas. I think humans must think more about protecting animals and nature. Maybe cloning is the way to save all endangered animals.

1. What is Dolly like?
A.It is like other ordinary sheep we often see.
B.It is a bit like the ewe.
C.It is exactly like the ewe researchers took genes from.
D.It is like a perfect sheep that researchers want to make.
2. What is the technology scientists use to clone animals?
A.They use the technology of animal improvement.
B.they take genes from an animal and use them to make a copy of it.
C.They change the genes of a ewe and then get them improved.
D.They combine advantages of some animals to make a better one.
3. By studying cloning, scientists can____.
A.make copies of many famous people in the world.
B.start a new industry where many more people may find jobs.
C.find ways to feed the whole world.
D.improve our health and produce fine animals.
4. From the passage we can learn that____.
A.people are all for the technology of cloning.
B.only scientists are interested in cloning.
C.people don’t hold the same opinion about cloning.
D.all the people think cloning unacceptable.
2018-08-06更新 | 52次组卷
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