单项选择题

Today’s policeman in large cities throughout the world (26) on modem inventions to help them in their work. In most places motor scooters and police patrol cars have (27) away with the need to patrol a beat on foot or on horseback. Policemen use telephones, (28) located throughout their districts, to make immediate (29) with headquarters. Radio, television, and computers (30) to speed the work of the modem force. Even boats and helicopters are part of the equipment of metropolitan police departments.
New technical inventions are widely used to (31) crime and speed the (32) of criminal cases. Electronic computers reduce from hours to minutes the time spent in (33) for fingerprints. Witnesses’ (34) of a criminal are coded and fed (35) a computer. The machine then sorts through the picture file of known criminals and selects the name and photograph of the most (36) suspect. Lie detectors, (37) such evidence is acceptable, are used to (38) the truth. A criminal identification tool in (39) in some places is the image reflector, or "imagemaker". This machine (40) a picture of a face (41) a screen. A detective manipulates the machine to (42) the parts of the face to match those of the suspect (43) described by the witnesses. The final picture is then photographed and sent to police in other areas. Sometimes skilled sketch artists employed by police departments (44) oral descriptions into (45) of a suspect.