（In an English class）
Mr Wu: Boys and girls, yesterday I asked you to collect some information about China's Tianwen 1 probe. Let's see what you've 1 .
Li Ping: I downloaded something. May I use the PPT, Mr Wu?
Mr Wu: Sure. 2 .
Li Ping: Look at his picture. On May 15, China's Tianwen 1 probe made a historic landing on Mars! Following the US, China is now the 3 country in the world to 4 land a probe on Mars. It will give Chinese 5 their first chance to study the Red Planet closely.
Gu Yue:6 was Tianwen 1 probe sent?
Li Ping: In July
2020. The probe entered Mars orbit(轨道) in February
2021. Experts said the 7 of sending the probe into orbit was equal to hitting a small ball from Paris and landing it in a hole in Tokyo. And the final 8 was even more difficult.
He Mei: I hear it's 9 called the "nine minutes of terror".
Li Ping: Yes. In nine minutes, the probe had to reduce its 10 from 20,000 km per hour to zero, landing from 125 km above Mars. 11 the probe is 320 million km away from Earth, there is a signal delay(延迟) of over 10 minutes if the research team tries to control it from Earth. So the probe had to 12 the landing on its own!
Gu Yue: That's amazing!
Li Ping: Indeed. When the probe finally slowed down, at 100 meters above Mars, it stayed in the air and 13 the landing area. It had to move away from the objects in its way such as rocks, 14 finally touching down.
Mr Wu: Well done, Li Ping! Thank you for showing our 15 Tianwen 1 probe. Let's see who has something else to share...
