单项选择题
A．Talking on giant screens. B．Automatic language translators. C．Computers that respond to brain waves. D．Computers that do not need wires.
A．The electricity had gone off during the night. B．Bob had set the alarm wrong. C．Bob did not want to be late. D．The Internet had informed the radio of a traffic jam.
A．One of the biggest barriers to Internet use is getting wires into rural areas. B．The wireless computers will be cheaper. C．People in rural areas don't have anything else to do. D．People in rural areas already have wireless boxes on their roofs.