单项选择题

A．Before dinner.
B．When she cleaned it.
C．After dinner.
D．When she went to bed.
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单项选择题
A．Playback parts.B．Speakers.C．Recording mechanism.D．Headphone.
A．Playback parts.
B．Speakers.
C．Recording mechanism.
D．Headphone.
单项选择题
A．Creation.B．Reproduction.C．Revolution.D．Painting.
A．Creation.
B．Reproduction.
C．Revolution.
D．Painting.
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