单项选择题

A．Space particles.
B．Precious stones.
C．Plastic.
D．Metal.
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单项选择题
A．The woman will be more careful, next time.B．They try to think of a solution.C．The woman find a spare key.D．They come downstairs.
A．The woman will be more careful, next time.
B．They try to think of a solution.
C．The woman find a spare key.
D．They come downstairs.
单项选择题
A．To produce them more cheaply.B．To keep them a uniform size.C．To make them lighter.D．To make them perfectly round.
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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