听下面一段材料，回答第1至3题。 1. What are the speakers mainly talking about? [ ]A. A research plan made in space. B. A certain ball made in space.C. A pr-高中英语-n多题

◎ 题干

听下面一段材料，回答第1至3题。

1. What are the speakers mainly talking about?

[ ]

A. A research plan made in space.
B. A certain ball made in space.
C. A problem in making things in space.

2. What might the balls most probably be used for?

[ ]

A. Children's games
B. Earth protection
C. Medical research

3. Why have astronauts made the ball in space?

[ ]

A. To keep them smaller
B. To keep them perfectly round
C. To produce them more cheaply

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