• A. a longer life expectancy for most people
• B. artists are adroit in dealing with their painting subject
• C. engage in the medical profession
• D. careful study and experimentation
• E. the chief centers for medical care in most countries
• F. science and technology

Doctors are skillful in dealing with patients just as______.

A．It has a sensor system that could issue a warning if the driver is drunk.
B．It has sensors that detect traces of alcohol inside the car.
C．It has sensors locked up in the ignition system.
D．It has a breathalyzer-like detection system.