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．to find the suspect B．to find the murdered couple C．to arrest the suspect D．to search a 1950 or 1951 Chevrolet
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