单项选择题

B
In Kansas City, Missouri, a computer helps fire fighters. The computer, which works very fast, has information about every one of the 350,000 street addresses in the city. Within two or three seconds after a call is received, the computer provides necessary information for the fire fighters. The information is then sent to them by the radio from the computer center in City Hall. The exact place of the burning and its size, type and anything else are clear to them.
The Kansas City computer system also has a medical record of each of the city’s 900 fire fighters. This kind of information is especially useful when a fire fighter is injured. With the information, doctors at the hospital can treat the injured fire fighters more quickly and easily.
The fire fighters themselves greatly appreciate (感激) the computer help. They know about possible danger ahead of them and can prepare for them. Many times the computer information helps to save lives and property (财产). Sometimes the lives are those of fire fighters themselves.
Mike Horan, a fire fighter captain, says, "I feel as if the computer is watching over (守护) me to help me if I get hurt.\
Which of the following is the best title of the text