1 . On May 15, 2021, China’s Tianwen Ⅰ probe (探测器) successfully landed on Mars (火星)! This was a very difficult job. Only the US has done it before Tianwen I’s long journey began in July 2020. It went into the orbit (轨道) of Mars in February. After lying around Mars for 3 months, it finally touched down on Mars.
The final landing was very dangerous. People call it the “nine minutes of terror (恐怖)”. The probe had to do everything by itself because the control room on Earth had no way to help it. It had to slow down from 20,000 km per hour to zero. How did Tianwen I do it?
1. What’s the best title of the text?A.Flying around Mars | B.Making a hard landing | C.On Mars | D.On Earth |
A.On May 15, 2021. | B.On August 15, 2021. | C.In July, 2020. | D.In February, 2020. |
A.With the help of humans. | B.Through the control room. |
C.On its own. | D.By making itself faster. |
A.dangerous | B.easy | C.boring | D.interesting |
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3 . Chinese scientists found Changesite-(Y)—the sixth new lunar mineral in moon samples (样品) brought back by the Chang’e 5 lunar probe (探测器) in December 2020. It has become the first lunar mineral found by Chinese scientists, making China the third nation in the world, after the United States and Russia, to have achieved such a success, reported China Daily.
Changesite-(Y) looks crystal clear like a diamond (钻石). But its chemical content (化学组成) is different from any other known mineral. It has a high level of rare earth, reported China Science Daily. Li Ziying, chief scientist of the lunar sample research, said that the finding of this new mineral will help researchers study the history and physical traits (特征) of the moon. The value of the rare earth in it will also be studied.
Besides the new mineral, scientists also measured the content of helium-3 (氦-3) from the Chang’e 5 samples. Helium-3 is a valuable fuel (燃料) that can provide safer nuclear energy (核能). It is not radioactive (放射性的) and would not produce dangerous waste. On Earth, we have only 15 to 20 tons of helium-3 that can be used. But after studying the moon’s soil, scientists said there could be at least 1 million tons of helium-3 on the moon. That’s enough for all people on Earth to have clean energy for 10,000 years!
1. How many kinds of lunar minerals have scientists found so far?A.One. | B.Three. | C.Six. | D.Seven. |
A.Its shape. | B.Its history. | C.Its looks. | D.Its size. |
A.Helium-3 will not produce any waste. | B.Helium-3 on the moon may be radioactive. |
C.The moon can provide us with enough clean energy. | D.There is enough nuclear energy on the moon for humans. |
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In Chinese traditional culture, the moon is a
Besides, with respect to the history of Chinese civilization(文明), China is the first nation to have the dream of flying to the sky.
The Chinese exploring moon project, named after Chang’e,
5 . We have seen lots of science fiction movies about aliens. People travel to stars and even fight with aliens in the movies. But are there real aliens in the universe(宇宙)? Most of us think it is impossible, just like fairy tales. But the answer of some scientists is yes. So they have been searching for aliens in outer space for many years. They hope to find life signs of aliens.
Some scientists are used to using radio telescopes(望远镜)to search for aliens in space. In order to find aliens, they have worked hard for over half a century, but so far they have found nothing. Then some scientists guessed aliens might not want to connect us, but aliens could answer our messages. So some scientists sent radio signals into the universe. They hope one day they would be picked up by alien technology. These scientists want to prove(证明)that we are not alone in the universe.
But what should we do if the “alien phone” rings one day? Should we answer it? Stephen Hawking, the famous physicist, thought it could be dangerous to connect aliens. He said that the main purpose of aliens’ visiting to the earth could be searching for our resources(资源). But other scientists think we have no need to worry. David Morrison, a NASA scientist, said, “If an alien radio signal reaches the earth from a planet thousands of light-years away, then they almost surely have solved all the problems we still have including the short of resources. Maybe they are much smarter than us, but why do they want to hurt us? I think we can try to connect them.”
根据短文内容,选择最佳答案。
1. ________ scientists believe there are aliens.
A.Few | B.All | C.Most | D.Some |
A.50 years | B.more than 50 years |
C.40 years | D.more than 100 years |
A.Aliens are friendly. | B.Aliens are dangerous. |
C.Aliens can’t be found. | D.Aliens have been on the earth. |
A.Because we want to find aliens. |
B.Because aliens have many skills. |
C.Because we want to help aliens. |
D.Because aliens are much smarter than us. |
A.Are We Alone? | B.Stephen Hawking’s Idea |
C.Protect Our Earth | D.How to find aliens |
6 . There are only two big astronomy (天文学) Museums in our country. One is in Beijing, the other is in Shanghai. The Shanghai Astronomy Museum opened to the public several months ago. The museum is in the Pudong New Area.
The museum has collected 70 stones from space including those from the moon, Mars and so on.
根据材料内容,从下面五个选项中选出能填入文中空缺处的最佳选项,使短文意思通顺,内容完整。
A.High technologies make the exhibitions lively. |
B.The museum also collects handmade art works. |
C.It covers an area of about 38,164 square meters. |
D.Visitors can watch the stars on a large screen clearly. |
E.If you visit the museum, you will have a truly educational trip. |
7 . Mars is a neighboring planet in our solar system. Scientists study Mars because it could hold clues that could help us learn more about life on Earth. For decades, scientists have used robot technology to better understand Mars. In December 2020, scientists introduced a group of robots named Mars Dogs at a yearly meeting.
The Mars Dog is a four-legged robot created by the company Boston Dynamics. It, along with other similar robots, can move around in ways the wheeled rovers (探测器) that explored the planet never could. Traditional Mars rovers are limited mostly to flat surfaces. However, many scientifically interesting Martian regions are only reachable by crossing very rough (崎岖的) ground or going below ground. Walking Mars Dogs are well-suited for such challenges—even if they fall down, they can get back up again. These robots can also explore underground by walking around rocks and lowering themselves into caves. They are even capable of selecting which path to take. While they do this, they collect measurements to build a map of what they see.
A Mars Dog would also be about 12 times lighter than present rovers. It would be able to travel much faster, reaching normal walking speeds of 5 kilometers per hour during tests. Compare that to the Curiosity rover that is presently exploring Mars. Curiosity rolls along the Martian surface at about 0.14 kilometers per hour.
Before going to Mars, the team members are testing the robot. They even take the robot to outdoor locations similar to Martian landscapes. Those tests show that the robots, without any help, can walk around rocks and map deep caves. “These behaviors could one day enable significant scientific missions to take place on the Martian surface and subsurface,” the scientists said at the yearly meeting.
1. What is the text mainly about?A.Ways robot dogs walk on the Martian surface. |
B.Robot dogs newly created for Mars exploration. |
C.Differences between the Mars Dog and Curiosity. |
D.Studies of Mars with the help of robot technology. |
A.They are much lighter. | B.They travel much faster. |
C.They are better at seeking shelter (避难所). | D.They move around more flexibly (灵活) . |
A.Concerned. | B.Doubtful. | C.Hopeful. | D.Uncertain. |
8 . Venus, the evening star, is a brother planet of our earth.
The United Nations suggested that all leaders in the world should meet to discuss cutbacks(缩减)of CO2. Other people in Europe have started a battle called “Green Peace Movement”.
A.This is called “the greenhouse effect”. |
B.It moves around the sun, just as the earth does. |
C.They try to keep the earth green. |
D.So no living things can live there. |
E.The answer is very simple—because the air has much CO2 in it. |
9 . When you look at the sky at night, the Moon looks bigger than the stars. Actually (实际上), the Moon is much smaller than the stars and the Sun. But the Moon is much closer to us than any star. That is why it looks so big.
The Moon moves around the Earth. It makes one trip in about four weeks. The Moon looks flat (平坦的) to us. But it is a round (圆形的) ball, like the Earth.
People once thought the Moon had fire on it. They thought the fire made it bright. Now we know the Moon is like a mirror. It gets its light from the Sun.
The sunlight comes from the Sun too. The Sun gives us light and warmth (温暖). It makes plants grow and turns leaves green. It makes life possible on the Earth. It is a life-giving star.
1. How long does it take the Moon to travel once (一次) around the Earth?A.Less than a week. | B.Nearly a month. |
C.Half a year. | D.More than a year. |
A.Because there is some fire on it. | B.Because it is near the Sun. |
C.Because there is a big mirror on it. | D.Because it gets light from the Sun. |
A.The Moon is much smaller than the stars and the Sun. |
B.The Moon is much bigger than the stars and the Sun. |
C.The Moon had fire on it. |
D.The sunlight comes from the Moon. |
A.Because it gives us water. |
B.Because there are some living things on it. |
C.Because plants and animals can’t live without it. |
D.Because people have to live in the dark without it. |
A.Interesting facts about the Moon | B.The Moon and the Sun |
C.Light from the Sun | D.The Earth |
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Our earth gets its warmth and light
When our part of the earth looks on to the sun, we see sunlight and we
When our part begins to turn
When we are facing the sun most directly, it is noon. Then the sun is closest to begin straight(直接地)above us. When we begin to