单项选择题

In Redwood City, police can hear gunfire within ______.

A．five seconds
B．seven seconds
C．seven minutes
D．thirty seconds
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单项选择题
The red dot on the police map shows ______.
A．the address of the criminal
B．Redwood City
C．the capital of California
D．the location of the gunfire
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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