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题型:阅读理解-阅读单选 难度:0.65 引用次数:34 题号:10775005

Although air travel comes with jet lag, delays and awful food, it offers a brief digital detox—a precious few hours away from the wave of emails, messages and app announcements. But not anymore, In flight Wi-Fi is getting faster and cheaper, and is an increasingly common offering on budget and flagship airlines.

But how does in-flight Wi-Fi actually work? To simplify, there are two ways for an internet signal to reach your device when you’re up in the clouds. The first is via ground based mobile broadband towers, which send signals up to the aircraft’s antennas (天线). As you travel into different sections of airspace, the plane automatically connects to signals from the nearest tower, so there is (in theory at least) no interruption to your Internet. But if you’re passing over large areas of water or particularly remote zones, connectivity can be an issue.

The second method uses satellite technology. Planes connect to satellites in space (35,000 km above the planet), which send and receive signals via receivers and transmitters. Information is transmitted to and from your smart phone via an antenna on the top of the aircraft. These are the same satellites that are used in television signals and weather forecasting. Information is passed between the ground and the plane via the satellite.

All of that technology is expensive. The costs are usually passed on to customers. Over half of the world’s aircraft will be equipped with in-flight Wi-Fi within the next few years. It is set to become a billion-dollar industry by 2020. In the near future you’ll need to find a better excuse than “Sorry I missed your message—I was on a plane”.

1. What sends signals up to the aircraft’s antennas?
A.Internet companies.B.Ground-based receivers.
C.Budget and flagship airlines.D.Ground-based mobile broadband towers.
2. Who will pay for the in-flight Wi-Fi technology in the end?
A.Aircraft passengers.B.Satellite company.
C.Broadband towers.D.The local government.
3. What can we infer about in-flight Wi-Fi from the last paragraph?
A.It serves every customer.B.It has a bright future.
C.It develops very slow.D.It’s a high-tech industry.
4. What is the best title for the text?
A.How to Use In-flight Wi-Fi?B.Why Only Some Airlines Have In-flight Wi-Fi?
C.Why Is In-flight Wi-Fi Expensive?D.How Wi-Fi Works on a Plane?

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文章大意:本文是一篇说明文。文章主要讲述了放射性碳测年法在画作防伪上的应用,工作原理。但是原子弹测试也会产生碳-14,会影响检测精度。

【推荐1】Radiocarbon dating has revealed two fake (伪造的) paintings in France — probably the first time the technique has been used in a police investigation. The paintings were supposedly works from around the early twentieth century. But a team led by scientist Lucile Beck at the University of Paris-Saclay dated them to sometime within the past 70 years.

The use of radiocarbon dating is gaining popularity, thanks to advances that require smaller samples than ever before. Removing tinier samples from artwork is becoming more palatable to museums and owners of paintings. If there is a chance that a painting is genuine — and therefore valuable — they don’t want the collection of larger samples to damage it.

All living things take in carbon, including radioactive carbon-14, from the atmosphere and from food. When a plant commonly used to make oil painting cloth dies, the carbon-14 that it contained continues to fall off. Radiocarbon dating measures what’s left to estimate the time that’s passed, says Mariaelena Fedi, a physicist at the National Institute for Nuclear Physics in Florence, Italy.

Atomic-bomb (原子弹) testing, which began in the 1940s and took off in the 1950s, quickly increased the amount of carbon-l4 in the atmosphere.Carbon-l4 peaked around 1964and went down after a partial ban on nuclear tests. Researchers can easily identify materials containing modern bomb-produced radiocarbon because their carbon-14 concentrations are higher than pre-1950s levels. Beck’s team tested its samples to see whether they bore the feature of that bomb-produced radioactive carbon-14.

The canvas fiber from the paintings clearly contained carbon from either the mid-1950sor after the year 2000, the researchers reported. Beck acknowledged that, ideally, the team would do further chemical analysis to support its findings, but the researchers were limited by the tight time.

1. What does the underlined word “palatable” in Paragraph 2 probably mean?
A.Impressive.B.Acceptable.C.Expensive.D.Difficult.
2. How does radiocarbon dating work?
A.By analyzing samples from artwork.
B.By removing the smaller samples.
C.By measuring the carbon-14 left.
D.By testing the carbon in the sample.
3. What can we learn about atomic-bomb testing in Paragraph 4?
A.It produces more carbon-14.
B.It helps identify fake paintings.
C.it reduces carbon concentration.
D.It has been stopped completely.
4. Which of the following is the best title for the text?
A.Paintings waiting to be identified
B.Two fake paintings found in France
C.New technology in painting becomes a hit
D.Radiocarbon dating proves an anti-fake helper
2023-01-12更新 | 336次组卷
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文章大意:本文是一篇说明文。讲述的是的日常生活中的机器人化和智能化给人们带来了便利的同时,使得人们对机器人化变得更加的焦虑。

【推荐2】We’re increasingly relying on automation and artificial intelligence in everyday life. But we still don’t quite trust robots and fear they will take our jobs.

Humankind has a complicated relationship with robots. On the one hand, we appreciate how they can do dangerous, repetitive work so we don’t have to. Robots don’t need vacations or medical insurance. And in areas such as agriculture, where farmers can’t find enough people to pick the produce, robots can shoulder some of those tasks. But polls (民意调查) show that the growing robotization of the planet makes us feel deeply agitated - and threatened.

Pew Research Center surveys found that more than 80 percent of Americans believed thạt by 2050, robots would do much of the work humans now do and about 75 percent believed that would make economic inequality worse. Across lines of race, age, and education, people who said automation has hurt workers outnumbered those who said it’s helped workers by two to one.

National Geographic sent David Berreby around the world to look at the present and future state of robots in society.

“Robots now deliver food in Milton Keynes, England, carry supplies in a Dallas hospital, disinfect (给……消毒) patients’ rooms in China and some European countries, and wander parks in Singapore, asking pedestrians (行人) to maintain social distance,” Berreby writes.

“It’s an unavoidable fact that we are going to have machines, artificial creatures; that will be a part of our daily life,” Carnegie Mellon University AI roboticist Manuela Veloso told Berreby. “When you start accepting robots around you, like a third species, along with pets and humans, you want to relate to them.”

A third species? That’s a new idea indeed. But were not there yet. So far, Berreby reports, robots can’t equal the human mind’s ability to do a lot of tasks, especially unexpected ones, and robots haven’t yet mastered common sense - all sill required to be a magazine editor.

1. What does the underlined word “agitated” in paragraph 2 probably mean?
A.DisappointedB.Proud.C.ComfortableD.Worried.
2. What did Pew Research Center surveys show?
A.Most people regarded workplace automation as good.
B.Most people agreed robots helped stimulate the economy.
C.More people thought robots did more harm than good.
D.More people feared robots would bring more social problems.
3. What does David Berreby’s description imply?
A.People enjoy robots’ company.
B.People have a growing reliance on robots,
C.Robots will pose a serious threat to humans.
D.Robots will soon replace humans in many fields.
4. What is David Berreby’s attitude to accepting robots as a third species?
A.Disapproving.B.Favorable.C.Concerned.D.Reserved
2022-12-23更新 | 93次组卷
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文章大意:这是一篇说明文。文章讲述了地热发电的好处及工作原理,同时表明了其未来的广阔前景。

【推荐3】Geothermal (地热的) power generation is one of our most stable renewable energy resources. Heat generated below the Earth’s surface can provide an almost unlimited supply to power and heat homes. And while geothermal electricity only accounts for around one percent of global generation, that is set to at least triple by 2050.

The Geysers in California is the world’s largest geothermal electricity complex. It produces enough electricity from its 18 power plants for 725,000 homes, totaling 20 percent of the state’s renewable energy. Superheated“dry steam” is channeled from a large sandstone reservoir heated by a large magma chamber (岩浆房) more than four miles beneath the surface.

Heat is captured from its passage through the rock and the heated water converts into electricity. Cooled water is then recycled and pumped back to gather more heat. EGS (enhanced geothermal systems) technologies will open up many more sites for geothermal energy.“You can effectively put a power plant anywhere,” said Will Pettit, director of the Geothermal Resources Council. “All you have to do is drill deep enough and you will find hot rock.”

Most geothermal plants actually use a flash steam technique, where hot water(at 360F or 180C)is drawn up, passed into lower pressure tanks and flashed into steam to power a turbine (涡轮机).Binary cycle (双元循环) plants are the growth technology because they can operate at lower water temperatures and more diverse geographical locations. They use moderately hot water to heat a secondary fluid with a lower boiling point—as low as 135F—to drive turbines.

Geothermal plants already emit 11 times less carbon dioxide per unit of electricity than the average US coal power plant. They can also operate 24 hours a day to provide a solid base load for homes and businesses.

There are drawbacks too. Seismic activity around drilling wells is a factor. High investment costs are another. But the US government is backing the sector with multi-million do llar funds to push forward advanced EGS research. Geothermal energy is set to play a big part in the low-carbon electricity future.

1. What is the significance of EGS (enhanced geothermal systems) technologies?
A.They have made geothermal energy less sustainable.
B.They allow for more efficient use of geothermal resources.
C.They have greatly reduced the need for drilling in geothermal sites.
D.They have opened up new methods of generating electricity from water.
2. What can be inferred from paragraph 4?
A.Power plants are not affected by water.
B.Hot water is used to power a turbine directly.
C.Binary cycle plants are less restricted to locations.
D.A flash steam technique is a must in geothermal plants.
3. What is the writer's attitude towards geothermal power?
A.Indifferent.B.Ambiguous.C.Pessimistic.D.Optimistic.
4. What is the main idea of the article?
A.Geothermal power is likely to be a great chance to sustainable power.
B.Traditional power has been replaced by geothermal power in America.
C.Businesses have been competing to gain an advantage in geothermal power.
D.EGS technologies have come into widespread application around the world.
2024-03-03更新 | 101次组卷
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