阅读短文, 回答问题。

John is seven years old. He is short. But he is polite. So his friend and his parents like him very much. It is Saturday today. John is at home. He is watching TV and his sister is doing her homework. At eleven, his father comes back with some oranges and bananas. John likes oranges very much and he wants to eat one. His mother asks,” Which orange do you want, John?

“The biggest（最大的）one, Mum. ”

“What?” says his mother. “You should be polite and want the smallest(最小的)one. ”

“Should I tell a lie（说谎）just to be polite, Mum?”