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Questions 11-14 are based on the following conversation. You now have 20 seconds to read the questions 11-14. According to the man, why did the astronauts made the beads in space

A．To produce them more cheaply.
B．To keep them a uniform size.
C．To make them lighter.
D．To make them perfectly round.

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单项选择题

单项选择题

Questions 11-14 are based on the following conversation. You now have 20 seconds to read the questions 11-14. According to the man, why did the astronauts made the beads in space 您的浏览器不支持 audio 元素。