1. 根据短文内容，判断正误。

Whose Dogs?

    Tom and his Mum walk in a street. They see a big dog and a small dog there.

    "Tom, do you know whose dogs they are?" his Mum asks.

    "Sorry, I don't know."

    "The big dog is the small dog's Mum." says the mother.

    "Oh, I know. The small dog is the big dog's son." answers Tom.

1. （1） Tom and his mother are going to the park.
3. （2） They see two dogs there.
5. （3） The small dog is the big dog's mother.
7. （4） Mom knows whose dogs they are.
9. （5） The big dog is the small dog's father.