单项选择题
A．the history of computer B．the different functions of computer C．the computer in the 21st century D．the scientific breakthroughs in the 21st century
A．computers now cannot yet tell us what symptoms a patient has B．computers now can remind you to turn off the lights in the basement C．the author has a car that can think for itself D．some computers now can already make loud complaints
A．put in B．take out C．change D．possess