| A.in 28 years | B.by 2020 |
| C.by 2053 | D.in 38 years |
| A.modern ideas | B.other choices |
| C.wise methods | D.natural means |
| A.the Spring Festival travel may still be a problem |
| B.90percent of the population will live in the city |
| C.robot teachers will check homework on computers |
| D.readers can discuss with each other through Internet |
| A.future changes in many ways | B.computers will be important |
| C.new things will be | D.old things will be gone |