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题型:阅读理解-阅读单选 难度:0.65 引用次数:60 题号:12359371

A troop of a million walking robots could enable scientific exploration at a microscopic level.

Researchers have developed microscopic robots before, but they weren't able to move by themselves, says Marc Miskin at the University of Pennsylvania. That is partly because of a lack of micrometre-scale actuators(微米级致动器)---components required for movement, such as the bending of a robot's legs.

Miskin and his colleagues overcame this by developing a new type of actuator made of an extremely thin layer of platinum, a very valuable silvery-grey metal. Each robot uses four of these tiny actuators as legs, connected to solar cells on its back that can make the legs bend in response to laser light(激光)and push their square metallic bodies forwards.

“Each solar cell is connected to a specific leg and by shooting the solar cells with a laser, you make the legs move in the way you want,“ says Miskin. "It's really cool.”

Through a process similar to that used in creating circuit(电路)boards, Miskin and his team were able to mass-produce more than a million of the microrobots, each of which could only be seen under a microscope.

The robots are only able to walk around, but Miskin says they provide important evidence of concept, showing that it is possible to develop and mass-produce microrobots with on-board electronics. The next step will be to put additional functions together, he says. "We're developing things where we'll have sensing capabilities and well have programmability.”

He also wants to develop microrobot groups that work together. “There's all sorts of cool stuff that happens when you wind up with a lot of robots working together,“ he says.

In the future, these robots could let us explore the world at a microscopic scale. They could potentially be developed to wander inside the human body. "The hope is that these robots are really going to take us into the micro-world," says Miskin.

1. What is the problem with previous microscopic robots?
A.Their lack of adjustable metal legs.B.Their wrong way of walking alone.
C.Their insensitivity to tiny actuators.D.Their inability to move automatically.
2. What directly enables microscopic robots' legs to bend?
A.Solar cells.B.Circuit boards.
C.A normal metal.D.Natural sunlight.
3. What is Marc Miskin's expectation?
A.To train an army made of microscopic robots.
B.To replace human employees with microscopic robots.
C.To change present microscopic robots into smaller ones.
D.To mass produce walking microscopic robots with on-board electronics.
4. What can be the best title for the text?
A.Robots Are Exploring the Micro-world
B.An Army of Tiny Robots Are in Concept
C.Walking Microscopic Robots Are Created
D.Robots Will Walk Inside the Human Body

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文章大意:本文是一篇说明文。文章主要介绍了中国科学家和工程师在开发空间太阳能项目方面的努力和挑战。

【推荐1】Amid global efforts to replace fossil fuels with clean energy, Chinese scientists and engineers are working on a bright idea — soaking up abundant energy from the sun and then beaming it back to Earth.

Multiple teams in China are currently focused on technologies needed for building and running a space-based solar power facility, which will allow the sun’s energy to be captured nonstop, something that isn’t possible from Earth, said Hou Xinbin, a senior researcher.   

After collecting solar energy, the space facility will transform it into electromagnetic radiation, such as microwaves, and laser beams and send it wirelessly back to the Earth’s surface. Receiving stations will, then turn these electromagnetic waves and laser beams into electricity for distribution to power grids (电网).

“As a key step to testing the workability of space-based solar power generation,   we want to make and place into orbit a pair of satellites — a large one that will collect solar power and transform it to microwaves and laser beams, and a smaller one responsible for receiving laser beams, Meanwhile, a ground station will be in charge of receiving the microwaves. The two satellites will form an in-orbit testing system for wireless power transfer, ”Hou said.

However, a host of technical issues must be solved before any commercially viable solar power project can take shape in space, Hou said. The challenges include developing high-performance components with acceptable sizes and weights these cannot be too big or too heavy — and integrating them into a satellite; and also ensuring that the power beams reach ground receiving stations with great accuracy, he said.

Hou noted that there is an urgent need in China to develop new sources of clean energy, which are sustainable, affordable and secure, and can be widely used, as China has announced that it aims to peak carbon emissions before 2030 and realize carbon neutrality before 2060. The power generated in this manner will be free of pollution and limitless, and this source of energy could also be used to power any spacecraft within its beaming range.

1. What is the advantage of a space-based solar power facility over an earth-based one?
A.It will capture the sun’s energy continuously.
B.It will capture the sun’s energy cheaply.
C.It will capture the sun’s energy directly.
D.It will capture the sun’s energy conveniently.
2. What’s the third paragraph mainly about?
A.Why the space facility will be built.
B.How the space facility will work.
C.What parts the space facility will consist of.
D.What benefits the space facility will bring.
3. Which will Hou probably agree with?
A.The construction of this space facility means a lot in China’s efforts to go green.
B.The construction of this space facility will soon become commercially available.
C.The construction of this space facility faces both support and protest.
D.The construction of this space facility is more of a dream than of a reality.
4. What is the best title?
A.China aiming to realize carbon neutrality by promoting clean energy
B.China aiming to shine in space-based solar power tech to boost clean energy
C.China aiming to take the lead in exploring solar power for clean energy
D.China aiming to become a space power by building a space-based facility
2024-02-16更新 | 66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】Researchers have been looking forward to using tiny flying robots to settle important tasks. The various machines could be used to help astronauts on space missions, and even to help bees with plant pollination(授粉). However, fitting the heavy electric equipment that is used to power and control the wings into the tiny robot has been challenging. Now thanks to RoboBee X-Wing—the world’s lightest aerial vehicle that can fly not tied to a power source.

Made by Harvard researchers, the insect-inspired robot weighs only 259 milligrams, has four wings whose distance is 3.5 centimeters, and stands 6.5 centimeters high. Its four small wings, which can flap up(拍动) to 170 times a second, are controlled by actuators(驱动器). They become small when the electricity passes through them. Six small solar cells, fitted above the wings to prevent them from disturbing the flight, provide the power.

RoboBee X-Wing is powered by six solar cells. To test its flying abilities, the team, led by doctor Noah Jafferis and PhD student Elizabeth Helbling, exposed the RoboBee X-Wing’s solar cells to LED lighting. To their delight, the tiny robot’s wings began to flap, and it rose, keeping a flight for about half a second. Though the robot lost its flight ability as soon as the power source was turned off, its short flight was cheered for its huge effect on the future of tiny flying robots.

However, though the current RoboBee X-Wing is a step in the right direction, it is not quite ready for main time. The researchers also hope to experiment with other power sources, such as batteries, sun light or radio frequency signals, and to add more advanced “brains” and sensor systems to navigate and complete tasks independently.

1. What can we know about small flying robots according to the first paragraph?
A.They are made to do ordinary tasks by scientists.
B.They can be used only for very dangerous task.
C.They can be powered directly by the energy of the sun.
D.It’s not easy to fit the heavy electric equipment into them.
2. Why is RoboBee X-Wing considered having a big effect on the future of tiny flying robots?
A.Because it is ready for the instant use.
B.Because it can take off and fly out of control.
C.Because it can fly not tied to a power source.
D.Because it can settle important tasks.
3. Which of the following is TRUE about RoboBee X-Wing?
A.It can’t be used in crowded places.
B.It can be used for giving directions.
C.It can use radio signals to power itself.
D.It still can’t be used widely at present.
4. In which section of a newspaper may this text appear?
A.Entertainment.B.Science.
C.Education.D.Health.
2020-06-29更新 | 23次组卷
阅读理解-阅读单选(约350词) | 适中 (0.65)
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文章大意:这是一篇说明文。文章主要介绍了一项针对机器人的凝视对人的影响的研究,介绍了研究开展的过程以及研究结果表明机器人的目光会影响人类做出决定和做出反应的方式。这些发现可能有助于决定类人机器人应该被放置在哪里以及如何放置。

【推荐3】Making eye contact with a robot can be a very strange experience. Scientists even have a name for the teeing: the “uncanny valley”. Now, researchers at the Istituto Italiano di Tecnologia (IIT) in Italy have found that it is more than just a feeling. They ran an experiment that showed how a robot’s gaze can trick people into thinking they are socially interacting with a human being. That experience can slow a person’s ability to make decisions.

“Gaze is an extremely important social signal,” said the lead writer, Professor Agnieszka Wykowska, “The question is whether the robot’s gaze will evoke very similar mechanisms in the human brain as a human’s gaze would.”

The team asked 40 participants to play a video game of “chicken”. Each player had to decide whether to permit a car to run straight toward another car or to turn to avoid a crash. The people played against a human-like robot sitting across from them. During breaks in the game, players had to look at the robot. Sometimes the robot would look back and at other times it would look away. As the interactions happened, the scientists collected data on participants’ behavior and brain activity.

“Our results show the gaze of the robot had an impact on the way humans made decisions and humans’ responses so humans were much slower in making decisions in the game,” Wykowska said. Given that the robot, is designed loosely to copy the shape and appearance of people, it’s not altogether startling perhaps that its gaze can influence people’s attention.

The findings could be useful for deciding where and how human-like robots might be placed. When we understand when and how robots change people’s social behavior, “then we can decide in which sort of context this is desirable and beneficial for humans and in which context this should not occur,” Wykowska said.

1. What does “it” mean in paragraph 1?
A.Making eye contact with a robot.B.A strange valley.
C.The research on robots.D.A robot’s experience.
2. According to the research, which of the following sentence is correct?
A.Robots were designed to make decisions to avoid a crash.
B.40 people were asked to play against each other.
C.Players were not allowed to look at the robot
D.Robot gaze could affect people’s decision making abilities.
3. What does the author think of the results according to paragraph 4?
A.Unsurprising.B.Amazing.
C.Disappointing.D.Threatening.
4. What’s the purpose of the text?
A.To advertise the robot.B.To introduce a study.
C.To stress the importance of eye contact.D.To show robots’ ability to make decisions.
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