| A.has made people feel younger |
| B.has changed people’s social position |
| C.has changed people’s understanding of age |
| D.has slowed down the country’s social development |
| A.a society | B.America |
| C.a place | D.population |
| A.be active when they are old |
| B.do the right thing at the right age |
| C.show respect to their parents young or old |
| D.take more physical exercises suitable to their age |
| A.normal | B.wonderful |
| C.unbelievable | D.unreasonable |