| 改错题。 |
| For different reasons，people are pouring into big cities，which cause much more trouble than expected.As the growth of the population，city problems are grown day by day.To begin with，big cities are becoming so crowded that it makes find jobs very difficult.As a result， people without jobs are likely to become danger to our society.In additional，the environment is getting worse and worse，but there is pollution and traffic  problems as well as.We can’t choose but face with them.In my opinion，big cities need to control the population to help develop itself for the future.In terms of improving the environment, every citizen should be called on to contribute to protect the environment. |