This morning, China successfully launched the Shenzhou-21 spaceship from the Jiuquan Satellite Launch Center. Three Chinese astronauts — Zhang Lu, Wu Fei, and Zhang Hongzhang — have arrived at the Tiangong Space Station. This is Zhang Lu’s second space mission, while his two teammates are experiencing space for the first time.

The astronauts will stay in space for six months. One of their main jobs is to look after some special “mouse astronauts” — two males and two females. This is China’s first experiment to raise mice in space. Scientists want to learn how space life affects the mice’s health and behavior. The research will help us understand how space travel might change living things.

Mice are mammals like humans. By watching how they adapt to space, scientists can learn more about how human bodies might react during long space trips. This knowledge will be important for future missions to the Moon or Mars.

After launching, the Shenzhou-21 spacecraft took about 3.5 hours to automatically dock with the Tiangong space station. The new crew meet the Shenzhou-20 astronauts who have been in space for over six months. After working together for several days, the earlier crew will return to Earth.

1.1. What is true about the Shenzhou-21 crew members?

A All are first-time fliers.

B Two are new to space.

C All are experienced.

D One is from another country.

解析：选B。B细节理解题。第一段明确指出张陆是第二次执行太空任务，而他的两位队友是首次进入太空，因此“有两名队员是太空新手”是正确答案。故选B。

2.2.What is one main task of the Shenzhou-21 astronauts?

A Study plant growth.

B Give a speech.

C Care for space mice.

D Build new rooms.

解析：选C。C细节理解题。原文第二段明确提到“One of their main jobs is to look after four special ‘mouse astronauts’”，照顾太空老鼠是宇航员的主要任务之一。故选C。

3.3. Why are mice good animals for space experiments?

A They are similar to humans.

B They are easy to feed.

C They are very small.

D They are strong.

解析：选A。A推理判断题。第三段明确指出“老鼠是和人类相似的哺乳动物”，研究它们在太空中的反应，是为了推断和了解人类在长期太空旅行中身体可能发生的变化。虽然老鼠体型小（C选项）可能是一个客观条件，但原文强调的核心原因是其与人类的生理相似性（A选项），这使得实验数据对我们更具参考价值。其他选项（B、D）在文中均未提及。故选A。

4.4. What happened after the new crew arrived at the station?

A The old crew left immediately.

B Both crews worked together.

C The station became crowded.

D New experiments started.

解析：选B。B细节理解题。第四段说明新乘组到达后，将与已在站上工作六个月的神舟二十号乘组会面并共同工作几天，然后老乘组才会返回地球。因此“两个乘组一起工作”是正确答案。故选B。

5.5. What other work will the Shenzhou-21 astronauts do?

A Build a new station.

B Train other astronauts.

C Do spacewalks.

D Make spaceships.

解析：选C。C细节理解题。最后一段提到“The Shenzhou-21 astronauts will also do spacewalks, repair equipment”，即太空行走是他们将要进行的工作之一。故选C。