The universe (宇宙) is so wide that we still don’t know much about it. It     1     the earth, the sun, the moon and the stars, and the space between them as well. Many of the stars can not be     2     because they are too far away. The moon travels around the earth. It’s our satellite. It’s the     3     to our earth. So far, humans have visited it already. And spaceships without people have reached other parts of the universe. Many countries have launched lots of man-made satellites into space. The satellites travel around the earth and help us     4     more about the earth, the weather and other things. They are used for     5     messages. With their help, TV and radio programs can be sent to countries all over the world. Satellites can also help us make telephone calls to foreign countries.

Our knowledge of the universe has been growing all the time.     6     space satellites (人造卫星), the world itself is becoming a much     7     place and people from different countries now understand each other better.

What do you know about Mars? What does it look like?

Mars is the fourth planet from the sun in our solar system and is     1     after Mars, the Roman God of War. Its diameter（直径）is 53% as long as     2     of the earth. Mars goes around the sun at a distance of about 228     3     kilometers. You can     4     which planet is Mars because it is bright red in the night sky. It looks like a red and orange ball. It’s very beautiful. But during spring and summer, the surface of Mars is covered by strong     5    . The gravity on the surface of Mars is about two     6     as strong as it is on earth. So a person who weighs 90 kilos on earth weighs only 36 kilos on Mars. The temperature on Mars is     7     -138°C and 28°C. The air has only 0.13% oxygen.

It     8     a spaceship about eight months to reach Mars from the earth when the two planets are the     9     to each other. Scientists are still     10     for more information about Mars.

Lots of scientists believe there’s life on other planets. Because of this, they keep doing research     1     the universe. They have sent astronauts to the moon. And they have     2     the answer. There’s no life on the moon. Not long ago they     3     spaceships to Mars. There, they didn’t find life. And they found the environment of Mars was     4     from that of the earth. Then they knew it was     5     for people to live on Mars.

    6     they haven’t received a message from other planets, they believe their idea is right. Recently they have discovered a planet. It’s     7     Proxima Centauri (比邻星). It’s very     8     to our earth. It is just over four light years away. Proxima Centauri is     9     than the earth. And there’s water on this planet. That     10     mean that life is possible there. Now scientists are studying this planet. Soon they will tell people the answer.

We use computers for study or play. But they are very different from supercomputers. Supercomputers can do operations quickly and have large amounts of memory. They are usually much     1     than the computers we use at home and school.

In 1983, China successfully developed its first supercomputer, the Galaxy-1. It could do     2     100 million operations per second, reported CRI.

The     3     of the Galaxy-1 made China the third country in the world to design（设计）and build its own supercomputers after the US and Japan. Since then, China has developed many other supercomputers.

Supercomputers are     4     our lives in different ways. Since they can operate very quickly, they are     5     in areas that need many quick calculations, such as weather forecasting.

A 12-man Chinese team landed on the Antarctic icecap peak(南极冰盖最高点) on January 18.They are the first people to     1     the peak of Dome A(冰琼A). It is 4039 meters above sea level(海拔)。

The team built a     2     there to study the changes of the weather, get ice samples(样本) from 150 meters to 200 metres below,and do other     3     . So far, the team has got nearly 100-meter-long ice samples have been able to get samples from the icecap peak in Antarctic and it is very important for people to study the weather changes and     4     changes in this area.

The Chinese scientists have also built a weather study system at the peak. The system can send out     5     about temperature, how strong the wind is, and many     6     about the weather.

The Antarctic icecap makes up 70% of the earth’s fresh water. By studying Dome A, scientists can get the lowest temperature of the earth and other information     7     the world’s weather changes. We     8     get this information from other places on the earth because Dome A is the best place for this kind of studies. So it is very important to land on the peak of Dome

Have you seen two robots argue with each other? In a library in Nanchang, Jiangxi Province, such     1     interesting scene took place.

The two robots are named Tutu and Wangbao. When a reader scanned the QD code (二维码) on Tutu     2     accident, Wangbao got angry, beginning to argue with Tutu. This amused (使人笑) the reader     3     posted a video of the argument on December 30th, 2020. Soon, the video     4     popular online.

In the video, Wangbao later said, “Tutu, let’s stop fighting, OK?” But Tutu seemed to be     5     “Your mood (情绪) sure swings a lot!” she said.

“    6     looks like how you argue with your girlfriend, ha ha,” one Internet user posted. “It’s terrible to hear people arguing, but I didn’t     7     I’d love to listen to robots arguing.” another user wrote.

The online video was     8     spread on Sina Weibo, with 50, 000 opinions by Saturday. This way, Tutu and Wangbao started to be Internet stars. When they were     9     on January 1st, 2021, the two seemed to have already forgiven (原谅) each other.

According to Zhong Xiaotong, a worker from the library, the two robots are set to help guide     10     in the library. But they can also sing and dance to have fun with readers. They can learn and act when they communicate with readers.