What provides autos with electric power in an automated highway system

A．keep in the right lane
B．wait to arrive at his destination
C．keep in constant touch with the computer center
D．inform the system of his destination by phone

A．doubtful about the necessity of keeping H-bombs at home for safety
B．unhappy with those who vote against the ownership of H-bombs
C．not serious about the private ownership of H-bombs
D．concerned about the spread of nuclear weapons