1. 听短文，判断下列句子正误。

1. （1） The longest wall in the world is the great Wall.
3. （2） The Great Wall is more than twenty thousand kilometres long.
5. （3） The Great Wall is more than three thousand years old.
7. （4） The Great Wall is about 7 metres high.
9. （5） Nobody died while they were building the wall.