完形填空。阅读下面短文，从短文后所给各题的四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项。
When it is Tom’s turn for a cut, Mr. Smith places a wooden board covered with a piece of red leather across the arms of the chair, so that the barber doesn’t have to bend to cut the boy’s hair.
“Hey, young man, you’re 1 , you won’t need this soon, you’ll be able to sit in the chair.” the barber says.
