A poor boy named Kelly,who was trying to pay his schooling b

A poor boy named Kelly,who was trying to pay his schooling by selling goods from door to door found that he had very little money left,so he decided to 1 for a meal at the next house.
However he was 2 when a lovely young woman opened the door.Instead of a(n) 3 he asked for a drink of water.The woman thought he looked 4 ,so she brought him a large glass of milk.He drank it 5 ,and then asked,“How much do I owe you?”
第二题为什么选B?