| A.It’s air pollution. | B.It’s sound pollution. |
| C.It’s dirty smoke. | D.It’s pollution and traffic jams. |
| A.there are too many people and cars but there is too little space |
| B.there are too many buses, subways and too many taxis |
| C.they are very narrow and dirty |
| D.there are too many buildings and there is too little space |
| A.more | B.many | C.less | D.fewer |
| A.People are making old roads wider and building more roads and footbridges. |
| B.People are driving fewer cars and walking to school. |
| C.People are riding bikes to work and walking to school. |
| D.People are making old roads wider and building more bridges across the rivers. |
| A.a policeman | B.an inspector | C.a computer | D.a TV set |