单项选择题
A．with the help of a Chevrolet owner B．with the help of computers C．by a witness D．in a car
A．Crime--A Grave Problem in the West B．Chevrolet--A Make of an Old Car C．Computer--A Powerful Aid in Fighting Against Crime D．Police--A Useful Force in the Fight Against Crime
A．Searching through the files of Chevies owners was impossibly difficult. B．The suspect lived within a fifteen-mile radius of the suburb. C．The suspect had received a number of traffic tickets before. D．It took the police hours to find the suspect.