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题型:阅读理解-阅读单选 难度:0.4 引用次数:116 题号:10472877

A black hole is created when a large star burns out. Like our sun, stars are unbelievably hot furnaces (熔炉) that burn their own matter as fuel. When most of the fuel is used up, the star begins to die.

The death of a star is not a quiet event. First, there is a huge explosion. As its outer layer is blasted off into space, the dying star shines as brightly as a billion suns.

After the explosion, gravity pulls in what’s left of the star. As the outside of the star sinks toward the center, the star gets smaller and smaller. The material the star is made of becomes tightly packed together. A star is so dense that a teaspoon of matter from it weighs billion of pounds.

The more the star shrinks, the stronger the gravity inside it becomes. Soon the star is very tiny, and the gravity pulling it in is unbelievably strong. In fact, the gravity is so strong that it even pulls light into the star! Since all the light is pulled in, none can flee. The star becomes black when there is no light. Then a black hole is born!

That’s what we know about black holes. What we don’t know is this: What happens inside a black hole after the star has been squeezed into a tiny ball? Does it keep getting smaller and smaller forever? Such a possibility is hard to imagine.

But if the black hole doesn’t keep shrinking, what happens to it? Some scientists think black holes are like doorways to another world. They say that as the star disappears from our universe, it goes into another universe. In other words, a black hole in our universe could turn into a “white hole” in a different universe. As the black hole swallows light, the white hole shines brightly — somewhere else. But where? A different place, perhaps, or a different time — many years in the past or future.

Could you travel through a black hole? Right now, no. Nothing we know of could go into a black hole without being crushed. So far the time being, black holes must remain a mystery.

Black holes are a mystery — but that hasn’t stopped scientists from dreaming about them. One scientist suggested that in the future we might make sure of the power of black holes. They would supply all of Earth’s energy needs, with plenty to spare. Another scientist wondered if a black hole could someday be used to swallow earthly waste — a sort of huge waste disposal in the sky!

1. What do we know about stars in the universe?
A.When a star begins to die, there’s no fuel left in it.
B.After the explosion, a star gets as small as a teaspoon.
C.A star explodes when it dies and then becomes smaller and smaller.
D.A star gets smaller and smaller because the outer layer of a star sinks toward the center.
2. Which of the following doesn’t help produce a black hole?
A.The dying star shines very brightly.B.The light can’t go out of the star.
C.The gravity inside the star is very strong.D.The star becomes very tiny and dense.
3. What can we know from the passage?
A.A star will blast and die when it lacks fuel to support its burning.
B.Man can never travel through a black hole but can make use of its power.
C.A black hole can swallow everything because it becomes smaller all the time.
D.Scientists have found that a black hole goes into another universe and becomes a white hole.
4. What is the best title for the passage?
A.A New Scientific Discovery: Black HolesB.How Do Black Holes Come into Being?
C.What Are Black Holes?D.Travel Through A Black Hole

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文章大意:本文是一篇议论文,主要讲述了虽然近来好莱坞似乎对多元宇宙欲罢不能,但它在科学家中仍然存在着深刻的争议。

【推荐1】If you live on this planet, there’s a decent chance you’ve seen the classic Star TrekEpisode, in which captain Kirk and several members find themselves in what appears to be another universe.

These days, it seems the idea of the multiverse—many worlds—is having its Hollywood moment. Its appeal as a storytelling device is obvious—characters explore a multi-world with varying degrees of similarity to our own, as well as different versions of themselves. Hence, it has been fully established in mainstream pop culture.

While Hollywood can’t seem to get enough of the multiverse, it remains deeply controversial (有争议的) among scientists. Advocates on the two sides show no mercy toward each other in their books, on their blogs. But physicists didn’t pull the idea out of thin air—rather, several distinct lines of reasoning seem to point to the multiverse’s existence. However, critics warn that making the multiverse legal could make it harder for the public to distinguish speculative (推测性的) theories from established fact, making it more difficult to keep pseudo-science (伪科学) at bay. Giving credit to such speculation risks “turning fundamental physics into pseudo-science”.

The multiverse controversy is rooted in the idea of test ability. If we can’t interact with these other universes, or detect them in any way, some experts insist that reduces them to mere philosophical speculation. But Carroll, an advocate for “many worlds”, argues that mathematics is the language describing our physical theories. Since Schrdinger’s equation (方程), on which Quanturr (量子) mechanic rests, predicts the existence of many worlds, so be it.

Could a more expansive view of the universe itself be the next breakthrough? As Siegfried puts it: “Every time in the past that we’ve thought, ‘We’ve got it; this is what the whole universe is’—the people who’ve said, ‘Maybe there’s more than one of those’ have always turned out to be right.”

1. Why is Hollywood so occupied with the multiverse?
A.It makes for engaging plots.
B.It is a much-talked-about topic.
C.It is helpful to popularize science.
D.It dominates the mainstream pop culture.
2. What do the underlined words in paragraph 3 probably mean?
A.Out of date.B.Out of place.C.Out of nowhere.D.Out of question.
3. According to the opponents, the basic standard of fundamental physics is that ______.
A.it can be detected somehow
B.it can be reasoned logically
C.it can be interpreted philosophically
D.it can be predicted by mathematics equation
4. What might be the author’s attitude toward the multiverse?
A.Doubtful.B.Dismissive.C.Unclear.D.Approving.
2024-03-12更新 | 569次组卷
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文章大意:本文为一篇新闻报道。文章报道了美国研究人员在《自然天文学》的两篇论文中指出,2019年澳大利亚望远镜检测到的比邻星无线电信号似乎来自地球,而不是外星人。

【推荐2】A radio signal detected by an Australian telescope in 2019, which seemed to be coming from the star closest to the Sun, was not from aliens, researchers report today in two papers in Nature Astronomy.

“It is human-made radio interference (干扰) from some technology, probably on the surface of the Earth,” says Sofia Sheikh, an astronomer at the University of Berkeley. But the signal, detected by Breakthrough Listen — an organization in search of aliens — looked interesting enough at first that it sent astronomers on a nearly year-long research to understand its origins.

“It’s really valuable for us to have these experiences,” says Jason Wright, the leader astronomer of the organization. “We need these signals so we can learn how we will deal with them — how to prove they are alien or human-made.”

Since 2016, Breakthrough Listen has used telescopes around the world to listen for possible broadcasts from alien civilizations. The program has picked up millions of signals of unknown origin, nearly all of which could be classified as coming from radio interference on Earth, from sources such as mobile-phone towers or aircraft radar.

The 2019 signal was different. It was detected by the radio telescope in southeastern Australia and came from the direction of Proxima Centauri — the nearest star to the Sun. Proxima Centauri is of great interest to alien researchers not just because it is nearby. The star has at least two planets, one of which orbits at the right distance for liquid water to be on its surface. Breakthrough Listen even plans to send a tiny spacecraft to this planet in the future to look for life there.

In November 2020, and in January and April this year, the researchers pointed telescope at Proxima Centauri to see if they could pick up the signal again. They could not. Instead, the team spotted other “look alike signals”. These signals had been proved out by the team’s analysis as being earthly interference. Further analysis showed that these signals were all interference from an unknown source, maybe electronic equipment that got shut down or fixed

The Universe gives us a “haystack (干草堆)”, says Sofia Sheikh. “It is our need to find the needle in it, and make sure that it is actually a needle that we found.”

1. Who devoted much efforts to the research of the 2019 signal?
A.Some scientists in southeastern Australia.
B.An astronomer at the University of Berkeley
C.The leader astronomer of Nature Astronomy.
D.An alien research organization Breakthrough Listen.
2. How did they find out the truth?
A.They sent a spacecraft to Proxima Centauri.
B.They confirmed the origin of similar signals.
C.They got signals from the same direction again.
D.They found some dead electronic equipment.
3. What did Sheikh want to tell us in the last paragraph?
A.It's very hard to direct an alien signal.
B.There are too many unknown signals.
C.There are very few needles in universe.
D.They should give up the research of aliens.
4. Which is the best title for the text?
A.Alien research moved a step forward
B.Signals from aliens were picked up
C.Signals interfered Astronomy research
D.Mysterious alien beacon was false alarm
2022-02-25更新 | 160次组卷
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【推荐3】A study confirmed that the cracks found on Mars’s surface last year by the Curiosity Rover are evidence of ancient lakes that likely dried up about 3.5 billion years ago. The new study provides further evidence of what the climate on the Red Planet may have been like in its ancient past.

The study, published online in Geology, proved that cracks on Mars’s surface previously photographed by Curiosity are dry mud cracks which could have only been formed when wet ground was exposed to the air. This conclusion was based on an analysis of a single area of rock known as “Old Soaker.”

Researchers used the Curiosity rover and information from its many tools including the Mars Hand Lens Imager, ChemCam Laser-Induced Breakdown Spectrometer (LIBS) and the Alpha Particle X-Ray Spectrometer (APXS) to study both the physical appearance and the chemistry of the rock, which is described as no bigger than a coffee table.

The analysis showed that cracks on the rocks were formed by exposure to air, rather than heat or the flow of water. In addition, the shape of the cracks suggests it experienced a single drying event on the planet, rather than getting wet and drying over repeatedly. The position of the cracks, closer to the center of the ancient lake rather than alongside it, also suggests that the lake levels changed often, rising and falling over time.

“The mud cracks are exciting because they help us to understand this ancient lake system,” lead study author Nathaniel Stein, a geologist at the California Institute of Technology in Pasadena, said, referring to the ancient lake system on the planet.

Scientists have known of the existence of ancient water on Mars for years. A 2015 NASA study that measured water in Mars’s atmosphere suggested that ancient oceans may once have had more water than our own Arctic Ocean. However, because the planet has less gravity and a thinner atmosphere than Earth, this water evaporated(蒸发) into space over the course of several billion years.

1. What is the Curiosity Rover?
A.An organization.B.A scientist.
C.A planet.D.A machine.
2. What do we know about the discovery on Mars?
A.The cracks are near the center of an ancient lake.
B.Mars was getting wet and drying more than once.
C.The lake level on Mars seldom changes over time.
D.The cracks on the rocks were formed by water flow.
3. What can we infer from the last paragraph?
A.Ancient water still exists on Mars now.
B.The gravity on Mars is stronger than that on Earth.
C.The atmosphere on Earth is thicker than that on Mars.
D.The ancient Arctic Ocean had more water than it has now.
4. What is the text mainly about?
A.Water on Mars.B.A trip to Mars.
C.A study on Mars.D.Cracks on Mars.
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