单项选择题

The telephone system is no longer operative.

A．running
B．moving
C．rotating
D．working
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单项选择题
The scientists began to accumulate a huge mass of data.
A．build up
B．put up
C．make up
D．clear up
单项选择题
Data from Voyager II have presented astronomers with a puzzle about why our outermost planet exists.
A．problem
B．mystery
C．question
D．point
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