dialogue: Julianne: Do you know anything about health food?
  Karly: It is so popular among people to preserve health now, so I read some books about health food.
  Julianne: Can you give me some examples?
  Karly: Drinking warm and fresh water in the morning on wakening up is one of ways to keep healthy.
  Julianne: Really? Why we must have warm and fresh water?
  Karly: Warm water can be good for your stomach, which is empty at that moment. And freshness can keep the water active to clean your digest system.
  Julianne: Anything else?
  Karly: Yogurt, because it has protein, vitamins and it is acidic. If you drink it everyday, your stomach will be more comfortable.
summary: Julianne asks Karly about health food and concrete examples. Karly lists warm and fresh water and yogurt and explains the reason.