A.The changes of future transportation |
B.What cars will be like in the future. |
C.How the world .is different from today |
D.The relationships between cars and people. |
A.-Because cities-take up a lot of space. |
B.Because cars cost too much of the city |
C.Because people prefer to take the subway |
D.Because roads are sometimes too crowded. |
A.New buses will take the place of cars as a way of transportation. |
B. Electric cars with sensors will be able to put an end to traffic jams. |
C.Future cars could be lighter because of strong and powerful batteries. |
D. Future buses can receive signals and change their routes accordingly: |
A.Uncertain. | B. Worried. |
C. Hopeful. | D. Careful. |