单项选择题

The ShotSpotter has helped police ______.

A．a little bit
B．cut down the use of weapons
C．tremendously
D．solve all the shootings
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单项选择题
What is the writer's attitude toward ShotSpooters
A．Be indifferent to it.
B．Be for it.
C．Be against it.
D．Be angry at it.
单项选择题
Eight microphones placed on rooftops ______.
A．talk to police
B．warn the public
C．listen for gunfire
D．play rap music
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