单项选择题
A．cannot understand the author's instructions B．are all devices used in the kitchen C．are useless without the help of computers D．are invented for the life in the 21st century
A．Earl Joseph is quite optimistic about the ability of computers to do more intelligent work for people in the future. B．Earl Joseph insisted that computers are smarter and more intelligent than human beings. C．Nowadays drivers can feed destinations into a computer that will explain what route to take and even tell where parking space are available. D．Both Ａ and Ｂ.
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