A young couple were becoming anxious about their four-year-old son, who had not yet talked. They took him to specialists, but the doctors found nothing wrong with him. Then one morning at breakfast the boy suddenly blurted（突然说出） , "Mom, the toast is burned."

"You talked! You talked!" shouted his mother. "I'm so happy! But why has it taked this long?"

"Well, up till now," said the boy, "things have been okay."