听下面一段较长对话，回答以下小题。
1. What are the speakers mainly talking about?
2. What might the balls most probably be used for?
3. Why have astronauts made the ball in space?
1. What are the speakers mainly talking about?
| A．A certain ball made in space. |
| B．A research plan made in space. |
| C．A problem in making things in space. |
| A．Children’s games. | B．Medical research. | C．Earth protection. |
| A．To keep them smaller. |
| B．To keep them perfectly round. |
| C．To produce them more cheaply. |
23-24高一下·全国·课后作业 查看更多[1]
（已下线）人教版2019必修三unit 4课后作业B层 巩固练Listening and Talking(含听力）
更新时间：2024-05-03 14:58:05
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