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
The newest satellite can ______ a thousand telephone conversations and a colour TV program at the same time.

A．carry
B．extend
C．bring
D．take
单项选择题
The psychologist picked several students ______ and said that they were highly intelligent and would achieve great success.
A．by accident
B．at random
C．on occasion
D．by chance
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