读对话，判断句子对(√)错(×)。
John: I have (有) a dog. It is big.
Mary: I have two cats. They are small. What color is your dog?
John: It is black. What color are your cats?
Mary: They are white.
( ) 1. John has (有) two dogs.
( ) 2. John has a big black dog.
( ) 3. John has no cats.
( ) 4. Mary has two black and white cats.
( ) 5. The cats are big.
( ) 6. The cats are small and white.
