阅读理解：

　　Mr．Black is a businessman(商人)．What does he look like? Oh, he is bald．He goes to the barber(理发店)every month to have a haircut(理发)．He sometimes takes his little son Robert with him．Robert always sits there and reads a picture book during his father’s haircut．The barber never cuts Robert’s hair because Mrs．Black always cuts it at home．

　　One day, Mr．Black says to his wife(妻子), “Robert is six now, and the barber is going to cut his hair next time．”

　　He takes Robert there the next day, and the barber cuts Mr．Black’s hair first．Then he puts Robert in the chair and says,” What do you want your hair to be like, young man?”

　　“Like my father’s,” says Robert, “with a hole(洞，窟窿)in the middle．”