Here is a good idea for the future cars.There will be electronic tracks everywhere in the streets.Electronic cars will run on these tracks.All the tracks and all the cars will be controlled by a great computer.For example,if you want to go from your school to a large factory,you just go out of your school and get into one of those cars outside.Then you press the button for the fatory.A signal is from the car to the central computer and the computer finds the route.The car takes you to the factory at high speed.How easy!
Don't you think it is a good idea for the future?If we really want to realize it,we must do something.
填入适当单词（每个“？”一词）
1.A great computer can be？ for controlling all the tracks and cars
2.The signal ？ the car to the place where you want to go
