(2026·广东深圳高级中学期末)On the afternoon of November 14th, 2025, the three astronauts of the Shenzhou-20 spaceship—Chen Dong, Chen Zhongrui, and Wang Jie—safely landed at the Dongfeng Landing Site. They returned aboard the Shenzhou-21 spaceship, successfully completing their 204-day-long mission in space.
At first, the astronauts were scheduled to return earlier. However, they had to wait nine days longer because a piece of space debris(碎片) hit the spaceship and made a small crack(裂痕) in one of the windows of Shenzhou-20.
China had prepared a good backup plan for such situations. Following the plan, the crew transferred to the Shenzhou-21 spaceship for their return journey. This was the first time in China's space history that a different working spaceship was used to bring astronauts back to Earth. During the extra days in orbit, the Shenzhou-20 crew continued to work with the Shenzhou-21 astronauts, carrying out valuable scientific experiments together.
Throughout their long mission, the Shenzhou-20 team completed many important tasks. They performed four spacewalks, moved cargo many times, and did a series of scientific experiments. One successful experiment involved heating a special metal called tungsten alloy(钨合金) to an extremely high temperature of 3,100 ℃.
This smooth and safe return shows the strength and trust of China's space programme. The well-prepared backup return plan was carried out effectively. The ground team worked together to finish the mission perfectly, and the intelligent spacecraft responded well. After landing, all astronauts were in good health. The mission marks another great achievement for China in space exploration.
()16. Which of the following best shows the structure of the passage?

A.Introduction→problem→solution→achievements→result.
B.Problem→introduction→solution→achievements→result.
C.Introduction→solution→problem→achievements→result.
D.Achievements→introduction→problem→solution→result.