answer: #Person1# buys a kilo of fresh Xinjiang grapes from #Person2# because they are sweeter.
documents: #Person1#: Can I help you, sir?
  #Person2#: Yes, I want to buy some grapes.
  #Person1#: What kind of grapes do you want?
  #Person2#: People say grapes from XinJiang are much sweeter than other kinds. Please give me a kilo of that.
  #Person1#: Ok, wait a moment please.
  #Person2#: Make sure they are fresh.
  #Person1#: Trust me.