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题型:阅读理解-阅读单选 难度:0.94 引用次数:303 题号:11488931

After traveling ten years and hundreds of millions of kilometers, a small probe (探测器) called Philae has for the first time landed on the surface of a comet, a solar system object made of ice and rock.

Philae was sent from the European Space Agency’s main Rosetta spaceship early Wednesday, November 12, 2014. Originally, the mission of the spaceship was to target Comet 46P but when the launch was delayed due to problems with the Ariane 5 launch vehicle, the mission was redirected to Comet 67P, to study the appearance and materials that make up Comet 67P.

The Philae research probe left its mother ship Rosetta and then began a trip toward the comet and landed on its surface hours later. The effort to land on the comet was considered dangerous because just before the planned landing, scientists identified problems in Philae’s active descent system thruster (推进器) used to land the probe.

Rosetta has been orbiting Comet 67P since August 2014. However, it was sent up into space in March of 2004. The spaceship circled the sun until it was in position to meet with the comet.

Comets are the most primitive (原始的) objects in the solar system. Scientists think that they have kept a record of the physical and chemical processes that occurred during the early period when planets were formed. By studying Comet 67P’s make-up and history, scientists wish to unlock the secret of the solar system and even the origin of human lives.

The Philae probe did a series of scientific experiments. Philae examined the materials that make up the comet looking for organic, or carbon-based materials, and inorganic materials. It lasted until March 2015, when the comet was too close to the sun and the surface temperature was too high for Philae to operate.

1. What was Rosetta launched to do?
A.To send Philae to Comet 67P safely.
B.To study the appearance of Comet 46P.
C.To collect information about Comet 67P.
D.To research on the make-up of the solar system.
2. Why was it hard for Philae to land on Comet 67P?
A.Due to technological issues.
B.As a result of power failure.
C.Because of lack of experience.
D.Due to problems in radio systems.
3. What do scientists think of the research on comets?
A.Challenging.B.Satisfying.C.Meaningful.D.Impractical.
4. What may be the best title for the text?
A.Philae landing on Comet 67P
B.Another comet found in space
C.One step further in geography research
D.Great improvement in spaceship design
19-20高一下·山东济南·阶段练习 查看更多[5]

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【推荐1】Driving to a friend’s house on a recent evening,I was attracted by the sight of the full moon rising just above my friend’s rooftops.I stopped to watch it for a few moments,thinking about what a pity it was that most city people,myself included,usually miss sights like this because we spend most of our lives indoors.

My friend had also seen it.He grew up living in a forest in Europe,and the moon meant a lot to him then.It had touched much of his life.

I know the feeling.Last December I took my seven-year-old daughter to the mountainous jungle of northern India with some friends.We stayed in a forest rest-house with no electricity or hot water.Our group had campfires outside every night,and indoors when it was too cold outside.The moon grew to its fullest during our trip.Between me and the high mountains lay three or four valleys.Not a light shone in them and not a sound could be heard.It was one of the quietest places I had ever known,a bottomless well of silence.And above me was the full moon,which struck me deeply.

Today our lives are filled with glass,metal,plastic and fibre-glass.We have televisions,cellphones,heaters,ovens,air-conditioners,cars and computers.

Struggling through traffic that evening at the end of a tiring day,most of it spent indoors,I thought:before long,I would like to live in a small cottage.There I will grow vegetables and read books and walk in the mountains.I may become an old man there,and wear the bottoms of my trousers rolled and measure out my life in coffee spoons.But I will be able to walk outside on a cold silent night and touch the moon.

1. The writer felt sorry for himself because .
A.there was too much pollution
B.he usually missed the full moon sights
C.he didn’t adapt to modern inventions
D.there were too many accidents on the road
2. What impressed the writer most in the mountainous jungle of northern India?
A.No modern equipment.
B.Complete silence.
C.The nice full moon.
D.The high mountains.
3. In Paragraph 4,modern things are mentioned mainly to .
A.show that the writer likes city life very much
B.tell us that people greatly benefit from modern life
C.explain that people have few chances to enjoy nature
D.show that we can also enjoy nature at home through them
4. The best title for the passage would be .
A.Touched by the Moon
B.The Pleasures of Modern Life
C.A Bottomless Well of Silence
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【推荐2】A new study suggests Earth could have lost up to 60 percent of its atmosphere in the collision of space objects that created the moon. Most scientists believe this event happened about 4 billion years ago when Earth was still developing. They think a massive object, possibly the size of the planet Mars, hit the Earth, sending vaporized particles (颗粒)into space. Gravity is believed to have brought these particles together to form the moon.

The study presents evidence that this collision might have caused Earth to lose between 10 to 60 percent of the atmosphere it had. A report on the study appeared in the publication Astrophysical Journal Letters. The researchers‘ impact assumption is one of three leading theories of how the moon was formed. The others suggest the moon was either created at the same time as Earth, or that it was captured by Earth's gravitational field as it traveled through space.

The researchers decided to explore how massive collisions of objects affected rocky planets with thin atmospheres. To do this, they carried out more than 300 “supercomputer simulations (模拟)The experiment considered the positions at which the objects hit the planet, the speed of the impacts, as well as the size and mass of the colliding objects. Earlier research suggested that impact collisions during the latter stages of the formation of a planet can affect its atmosphere. The computer models in this study expanded on this idea. They showed that a collision like the one that may have formed the moon likely took a large part of Earth's atmosphere.

1. What do most scientists believe?
A.Earth has lost its atmosphere in the collision.
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C.The planet Mars hit Earth about 4 billion years ago.
D.The collision of space objects caused the atmosphere to increase.
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A.To inform.B.To persuade.C.To debate.D.To warn.
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【推荐3】When we look at Earth from space, we see a blue, watery world. It is no coincidence that three quarters of the surface is covered by oceans. Water is very common in the universe and is essential for lives. But life needs water in the form of liquid, not ice, and not vapor and that is a little bit less common.

For a planet to have liquid water at its surface, three things are important. First, the planet needs to be large enough that the force of gravity keeps the water molecules (分子)from flying off into space. For example, Mars is smaller than Earth, so it has less gravity, and that is one important reason that Mars has a very thin atmosphere. Second, the planet needs to have an atmosphere. Without an atmosphere, the planet is in a vacuum (真空),and liquid water isn't stable in a vacuum. For example, our moon has no atmosphere, so if you spill some water on the moon, it will either boil away as vapor, or freeze solid to make ice. Third, the planet needs to be at the right distance from its star.

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1. What do we know about water from the text?
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A.It is very hotB.It has no atmosphere
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