用数字(1～6)为下列句子排序。(15分)
(  )Oh，baby pigs are called piglets.
(  )Puppies? Can they swim?
(  )I see. They are piglets. How cute! What are those?
(  )Mum. Look at these baby pigs.
(  )They are puppies.
(  )No，they can't.