1. 听录音，判断正误。

Our city is a beautiful place. There are clean streets. On both sides of the streets,<br />there are many tall trees. They make the city beautiful. There is a river through our city.<br />The water is clean, but it was dirty before. Some people threw rubbish into the river,<br />and there is a factory with a bad strong smell. But now people know that clean air and water<br />are very important to their health, so they don't throw rubbish into the river anymore.<br />The factory doesn't make any dirty black smoke now.

1. （1） Our city is a beautiful place.
3. （2） There were many tall trees in the clean streets.
5. （3） There was a clean river through our city.
7. （4） People throw rubbish into the river.
9. （5） There was a factory with a bad strong smell.