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To persist, life must reproduce. Scientists at the University of Vermont, Tufts University, and the Wyss Institute for Biologically Inspired Engineering at Harvard University have discovered an entirely new form of biological reproduction and applied their discovery to create the first-ever, self-replicating (自我复制的) living robots.

Named Xenobots after the African clawed frog from which scientists take their stem cells, the machines are less than 0.04 inches wide—small enough to travel inside human bodies. They can walk and swim, survive for weeks without food, and work together in groups. They even have regenerative capabilities; when the scientists sliced into one robot, it healed by itself and kept moving.

The Xenobots could potentially be used toward a host of tasks. Xenobots could be used to clean up radioactive waste and collect microplastics in the oceans. Some Xepobots had holes in their center, which could potentially be used to transport drugs or medicines. “Traditional robots degrade (降解) over time and can produce harmful ecological and health side effects,” researchers said in the study, which was published in the Proceedings of the National Academy of Sciences. As biological machines, Xenobots are more environmentally friendly and safer for human health. Aside from these immediate practical tasks, Xenobots could also help researchers to learn more about cell biology—opening the doors to future advancement in human health and longevity.

While the prospect of self-replicating biotechnology could spark concern, the researchers said that the living machines were entirely contained in a lab and easily destroyed, as they are biodegradable and regulated by experts. “There are many things that are possible if we take advantage of this kind of plasticity (可塑性) and ability of cells to solve problems,” said Joshua Bongard, one of the lead researchers at the University of Vermont.

【小题1】What can we learn about Xenobots from Paragraph 3?
A.They can be widely applied to curing diseases.
B.They can serve well the research on human health.
C.They are specially designed to collect radioactive waste.
D.They are harmless to the environment by degrading plastics.
【小题2】What is Bongard’s attitude towards the self-replicating biotechnology?
A.Positive.B.Indifferent.C.Doubtful.D.Ambiguous.
【小题3】What does the text mainly talk about?
A.A new application of a machine in medicine.
B.The latest trend of developing biotechnology.
C.The invention of the first self-reproduction robots.
D.An experiment on cells from African clawed frogs.
【小题4】In which column of a newspaper may the text appear?
A.Entertainment.B.Health.C.SportsD.Science.
21-22高二下·陕西咸阳·期中
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Sometimes it takes a work of art to give the inspiration for advances in science. For example, Elon Musk’s dream of humans living on other planets was first inspired by Isaac Asimov’s Foundation book series. Amazon CEO Jeff Bezos, a massive fan of the Star Trek television series, founded his very own space company Blue Origin. Let’s explore some of the technologies from science fiction that have been brought to life.

Remote control

Frank Herbert’s 1965 novel Dune features a small flying robot device that is piloted remotely, one of the earliest appearances of drones in science fiction. With the first permit for commercial drone use in the US given in 2006, drones became a reality, and can now be found taking on multiple roles in photography, farming and military.

From thin air

The television show Star Trek, first appearing on screens in 1966, inspired science. One of the most unexpected examples may be the 3D printer. In the program, a device can create any object desired within a matter of seconds. Researchers at the University of California, Berkeley, US, developed a 3D printer in 2019 that shapes objects using rays of light. The device uses light to alter the density of resin (树脂), changing the material from a liquid to a solid in order to shape the desired object.

Starting the heart

One of the first sci-fi novels, Frankenstein by Mary Shelley has had a huge impact on science. Earl Bakken, the inventor of the pacemaker (起搏器), a device placed into the chest that helps the heart to pump blood using small electrical impulses, was inspired by the 1931 movie adaptation of the book. “What impressed me the most... was the creative spark of Dr Frankenstein’s electricity,” Bakken told the Atlantic. Defibrillators (除颤仪), which restart the heart with an electrical current after a cardiac arrest (心脏停搏), also resemble the electric shock that gave the monster life.

【小题1】Whose work inspired science?
A.Elon Musk’s.B.Jeff Bezos’.C.Frank Herbert’s.D.Earl Bakken’s.
【小题2】Which of the following can create new things from “nowhere”?
A.Drones.B.3D printer.C.Pacemakers.D.Defibrillators.
【小题3】Which can be summarized from the passage?
A.Science fiction thinks big.B.Technology flies out of our imagination
C.Imagination leads to advanced civilization.D.Scientific development relies on technology.

As the planet gets hotter, the need for cool living environments is becoming more pressing. But air conditioning (AC) is the main cause of global warming since AC units use lots of energy. Now, researchers from McGill University have found in a new study an inexpensive and green solution to AC in hot climates.

The researchers set out to answer how to achieve a new benchmark (基准) in natural cooling inside naturally conditioned buildings in hot climates such as Southern California. They checked the use of roof materials that radiate (散发) heat into the open air, even under direct sunlight, and how to put them together with temperature driven ventilation (通风). These cool radiator materials and coatings are often used to stop roofs overheating. Researchers have also used them to improve the performance of coolers. There is a real possibility of applying the materials to housing design more fully, so they can not only radiate indoor heat into the outside of a house in a natural way, but also drive regular and healthy air changes.

“We found we could maintain air temperatures several degrees below the surrounding temperature,” said Remy Fortin, lead author of the study. “We did this taking healthy ventilation air changes into consideration.” This was a significant challenge, considering air exchanges are a source of heating when the aim is to keep a room cooler than the outside.

The researchers hope the findings will be used to positively impact communities suffering from dangerous climate heating. “We hope that materials scientists and engineers will be interested in these results, and that our work will inspire more creative thinking for how to make breakthroughs in radiative cooling materials while finding simple but effective housing design solutions,” said Salmaan Craig, who took part in the project.

【小题1】What does paragraph 2 mainly tell us about the study?
A.Its process.B.Its priority.C.Its reason.D.Its schedule.
【小题2】What did the researchers have to consider while carrying out the study?
A.Houseplants.B.The cost of a house.
C.Air exchanges.D.The pay of a designer.
【小题3】What does Salmaan expect of the findings?
A.They’ll cut the price of the power.B.They’ll bring about creative ideas.
C.They’ll speed up the production.D.They’ll benefit local developers.
【小题4】Which is the most suitable title for the text?
A.A Green Solution to Air ConditioningB.The Hardship of Building an AC Unit
C.A Promising Future of New EnergyD.The Cause of Rising Temperatures

Steve Davies, a 23-year-old board designer in Wales, is developing a surfboard made from mycelia (菌丝体) instead of plastic.

A 2022 report showed that more than 400, 000 boards are made each year. The global market for surfboards reached $2.2 billion in 2020 and is expected to reach $3.2 billion by 2027. But about 80% of boards are made from plastic, which can take hundreds of years to break down. This will be a serious problem for the environment as the market grows.

“And even when it does break down, it can go into fish’s ecosystem (生态系统), which means that humans will end up eating this plastic,” Davies said.

Davies made his first surfboard in 2020, but the experience showed him many harmful materials were produced in making each board. During his final year at university, he started looking into mycelia and making his beloved sport more environment-friendly.

“My family owns a farm with horses, so I was quickly able to collect substrate material (基料) in the form of horse bedding, to allow the mycelia to grow in,” Davies explained. “This gave me an idea to start a surfboard business—growing surfboards on a farm near the beach and using waste materials from that very same farm, reducing the transport of materials, and therefore reducing carbon (碳) given out into the environment.”

“In the right conditions, we will grow a mycelium board in around 21 days,” Davies said. “The dream would be to make it the new standard. Connecting with nature would be the new design rules and that would be really cool. We’re using the sea and we should give back to the sea.”

【小题1】What do the numbers in Paragraph 2 mainly show?
A.Going surfing costs a lot of money.B.Surfing is popular with young people.
C.Designing surfboards is a good business.D.Making eco-friendly surfboards is necessary.
【小题2】Why does Davies mention “fish’s ecosystem”?
A.To explain a rule.B.To present a reason.
C.To make a comparison.D.To share an experience.
【小题3】What is Paragraph 5 mainly about?
A.Why Davies loved to design surfboards.
B.What made Davies’ surfboard business possible.
C.Why Davies wanted to study mycelia at university.
D.How Davies collected substrate material to make surfboards.
【小题4】What can we learn from Davies’ words in the last paragraph?
A.He supports environment-friendly products.B.He hopes to succeed in selling surfboards.
C.He loves to get designing ideas from sea.D.He dreams of creating cooler surfboards.

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