单项选择题

The service operates 36 libraries throughout the country, while six ______ libraries specially serve the countryside.

A．mobile
B．drifting
C．shifting
D．rotating
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单项选择题
The toy maker produces a ______ copy of the space station, exact in every detail.
A．minimal
B．minimum
C．miniature
D．minor
单项选择题
The ______ stuck on the envelope says By Air .
A．diagram
B．label
C．signal
D．mark
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