1 . In many science fiction (科幻) movies, men travel to faraway stars and even fight with aliens. But are there real aliens in the universe (宇宙)? The answer of some scientists is yes. So they have been searching for aliens in outer space for many years. They hope io 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 our solar system 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 don’t they hurt us? I think we can try to connect them.”
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1. ______ scientists believe there are aliens.
A.Few | B.Some | C.Most | D.All |
A.more than 50 years | B.50 years | C.40 years | D.30 years |
A.Aliens are dangerous. | B.Aliens are friendly. |
C.Aliens can’t be found. | D.Aliens have been on the earth. |
A.Because we want to find aliens. | B.Because aliens are much smarter than us. |
C.Because we want to help aliens. | D.Because aliens have many skills. |
A.How to Use Radio Telescope. | B.Stephen Hawking’s Idea. |
C.Protect Our Earth. | D.Are We Alone? |
Are we alone in space? Is the Earth the only planet that has life?
On Feb. 22nd, NASA said they found seven Earth-like planets.
For scientists, the finding is not an end. Next, they will try to find out if the planets have atmospheres(大气层).
A.It means there could be liquid water on them. |
B.That seems too far away from us. |
C.These are big questions in the science world. |
D.The seven planets are very close to one another. |
E.They all nearly have the same size as Earth. |
3 . The universe (宇宙) is everything out in space. Nobody
Now let me tell you something about the
We live on the outside part of the Earth. Around us is the air. It takes the Earth 24 hours to turn in a full
Can you tell me something else about the universe? I’m
A.studies | B.knows | C.asks | D.forgets |
A.protect | B.leave | C.mean | D.see |
A.universe | B.Sun | C. Earth | D.Moon |
A.goes | B.waits | C.shows | D.keeps |
A.water | B.ice | C.snow | D.cloud |
A.watch | B.hear | C.feel | D.touch |
A.world | B.circle | C.part | D.way |
A.easily | B.brightly | C.quickly | D.slowly |
A.cleaner | B.brighter | C.warmer | D.darker |
A.honest | B.lucky | C.interested | D.tired |
The Sun is very i
The universe (宇宙) is everything out in space. Nobody
Now let me tell you something about the
We live on the outside part of the Earth. Around us is the air. It takes the earth 24 hours to turn in the full
Can you tell me something else about the universe? I’m
A.studies | B.knows | C.asks | D.forgets |
A.protect | B.leave | C.mean | D.see |
A.universe | B.Sun | C.Earth | D.Moon |
A.goes | B.waits | C.shows | D.keeps |
A.water | B.ice | C.snow | D.cloud |
A.watch | B.hear | C.feel | D.touch |
A.world | B.circle | C.part | D.way |
A.easily | B.brightly | C.quickly | D.slowly |
A.cleaner | B.brighter | C.warmer | D.darker |
A.honest | B.lucky | C.interested | D.tired |
6 . We all live on Earth and enjoy our life every day. Do you know all the interesting facts about the Earth?
The Earth is not round.
Do you think the Earth is round? Will the Earth is not completely round.
The Earth is really old.
Grandmas and grandpas are old, but the Earth is much older. Scientists think that the earth is about 4.5 to 5 billion (十亿) years old.
Much of the Earth is water.
About 70% of Earth is water, and only about 30% of Earth is land.
Earthquakes happen all the time.
Earthquakes (地震) take place all the time. But most of the time, they are very small and human beings cannot even feel them.
________.
There are many mountains on Earth. Mount Everest is the most famous one because its peak is five and one-half miles above sea level. It is the highest. There are more interesting facts about the Earth. Can you tell us some?
1. How old is the Earth?A.4 billion. | B.4.5 billion to 5 billion. | C.5 billion. | D.5 billion to 5.5 billion. |
A.Three. | B.Four | C.Five. | D.Six. |
A.Many mountains. |
B.Mount Everest is very famous. |
C.Mount Everest is five and one-half miles high. |
D.Mount Everest is the highest mountain. |
A.Facts about Earth | B.The earthquake |
C.Life on Earth | D.Mountains on Earth |
7 . Do you know anything about the Moon? How much do you know about it?
The Moon is an unfriendly place. There is no air or water. There are only lots of dust and mountains around on it.
But from the Moon, you can see our beautiful Earth. It is shining more brightly than the other stars in the dark.
A.So there are no animals or plants there. |
B.The Moon is also a very quiet world. |
C.Do you want to go there? |
D.You can take some photos with your camera. |
E.When the Sun shines in the day, the temperature is very high. |
8 . We live on Earth. It’s our home. But how much do you know about it? Let me tell you something about our Earth. The Earth is like a huge ball. Like the other seven planets(行星), the Earth is running around the sun. It’s the third nearest one to the sun. It takes the Earth about 365 days to run around the sun. At the same time, the Earth is going around itself. If you are in space, you can see lots of white clouds over the surface(表面)of the Earth. Through the clouds, you can see the blue colour of the oceans, and the brown colour of the land. About 70% of the Earth is covered with water. Why do we have day and night? When the half of the Earth is facing the sun, it’s daytime. As the Earth turns, and this half is away from the sun, night is coming. And it’s daytime for the other half.
1. How many planets are running around the sun?A.Seven. | B.Eight. | C.Seventy. | D.Ten. |
A.50% | B.30% | C.About 70% | D.About 30% |
A.All the planets and stars are running around the sun. |
B.The Earth is the nearest planet to the sun. |
C.It takes the Earth about 365 days to run around the sun. |
D.Only the Earth runs around the sun. |
A.the Earth is running around the sun |
B.the Earth is away from the sun |
C.the half of the Earth is away from the sun |
D.the half of the Earth is facing the sun |
A.In storybooks. | B.In newspapers or magazines. |
C.In cartoon books. | D.In fiction(科幻)stories. |
9 . China’s Chang’e 5 mission is the most recent successful lunar sample return mission. On Dec 17, the Chang’e 5 lunar probe(探测器)returned home along with 1.7 kg of lunar rocks and soil.
The main goal of Chang’e 5 was to bring things back. And China’s new samples stand for a fresh start for its lunar research and space exploration.
The samples were collected at Mons Rumker, also known as the Ocean of Storms. The site has never been sampled(取样)before. Samples that were taken by the US previously(以前)are all more than three billion years old, while the Chang’e 5 samples are less than two billion years old. Scientists are now able to study late-stage(后期)volcanic(火山的)activity on the moon. This activity shaped the younger parts of the rocky moon we see today, according to Long Xiao, a scientist at the China University of Geosciences.
The moon’s volcanic history is not the only mystery that Chang’e 5 is going to solve. The mission could also help scientists learn more about the history of the whole solar system(太阳系). Scientists will check the amount of radioisotopes(同位素)in the samples to accurately(精确地)date(确定年代)them-the radioisotopes decay(衰减)over time.
Dating lunar samples will give us more accurate ages not only for the moon, but also for other planets in the solar system. These planets are often dated by comparing them to similarly aged areas of the moon.
1. What did China’s Chang’e 5 lunar probe bring back?A.1.7 kg of lunar rocks and soil. | B.1.7 kg of lunar rocks. |
C.1.7 kg of lunar soil. | D.1.7 kg of lunar water. |
A.A new start of space travel. | B.A great success. |
C.A start for its lunar research and space exploration. | D.A victory of getting the new samples. |
A.At the Mars. | B.At the Ocean of Storms. |
C.Behind the Mons Rumker. | D.Behind the Ocean of Storms. |
A.The moon’s volcanic history. | B.The history of the whole solar system. |
C.The history of the Earth. | D.The moon’s volcanic history and the history of the whole solar system. |
A.give us more accurate ages for the moon |
B.give us more accurate ages for other planets in the solar system |
C.give us more accurate ages both for the moon and for other planets |
D.give us more accurate ages for the Earth |
10 . Thousands of years ago, Chinese poet Qu Yuan wrote the poem Tianwen, meaning quest for heavenly truth. Inspired by the great poet, China has named its upcoming series of planetary exploration missions(任务)
The first step for the Tianwen series is to
Mars has been a popular target for space exploration. Countries like the US and Russia have been exploring it
This is partly because Mars is relatively(相对地) close to Earth
There have been 56 Mars missions so far, of which 26 have been
A.by | B.under | C.after | D.to |
A.land | B.launch | C.fly | D.set |
A.expected | B.wished | C.required | D.invited |
A.pick | B.dig | C.bury | D.collect |
A.since | B.in | C.on | D.during |
A.referred to | B.connected to | C.thanks to | D.compared to |
A.soil | B.air | C.environment | D.temperature |
A.look for | B.look up | C.look through | D.look into |
A.joyful | B.successful | C.peaceful | D.cheerful |
A.broke | B.dropped | C.failed | D.fell |