单项选择题
A．dissolve some new chemicals B．find out what may have happened on the Earth 4 billion years ago C．simulate bolts of lightning on the ancient Earth D．analyze a liquid
A. Put in. B. Take out. C. Change, D. Possess.
A．computers can not 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