Passage Three What kind of car will we be driving by the year 2010？ Rather different from the type we know today. With the next decade bringing greater change than the past 50 years， the people who will be designing the models of tomorrow believe that environmental problems may well accelerate the pace of the car s development. The vision is that of a machine with 3 wheels instead of 4， electrically-powered environmentally clean and able to drive itself along intelligent roads ，equipped with built-in power supplies. Future cars will pick up the fuel during long journeys from a power source built into the road， or stored in small quantities for traveling in the city. Instead of today s seating arrangement two in front， two or three behind， all facing forward， the 2010 car will have an interior with adults and children in a family circle. This view of future car based on a much more sophisticated road system. Cars will be automatically controlled by a computer. All the driver will have to do is say where to go and the computer will do the rest. It will become impossible for cars to crash into one another. The technology already exists for the car to become a true automobile.
17. What is the designer s vision of the cars of tomorrow？
18. What else does the passage tell us about the future car？
19. What is the seating arrangement for future cars？
20. What is the only thing the driver of the future car has to do？