单项选择题

A．Friends.
B．Colleagues.
C．Brother and sister.
D．Husband and wife.
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单项选择题
A．Playback parts.B．Recording mechanism.C．Speakers.D．Headphone.
A．Playback parts.
B．Recording mechanism.
C．Speakers.
D．Headphone.
单项选择题
A．Creation.B．Revolution.C．Reproduction.D．Painting.
A．Creation.
B．Revolution.
C．Reproduction.
D．Painting.
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