单项选择题

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

A．mobile
B．drifting
C．shifting
D．rotating
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单项选择题
If you don't know the answer to this question, it is ______ to leave it blank and deal with the other items first.
A．valuable
B．advisable
C．considerable
D．probable
单项选择题
The professor recommends that we ______ tile experiment until it is carefully designed.
A．don't start
B．not start
C．will not start
D．are not to start
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