Jack is six years old. He has no sisters. But he has a brother. His brother's name is Mike. Jack likes eating apples, oranges and bananas. Sometimes he eats some of his brother's apples. And his brother often beats（打）him for this. He doesn't like Mike. This September he goes to school. It's the ninth（第九） day at school. Jack and his classmates are having a new lesson.

    "Jack, what is five minus（减） three, please？" asks the teacher.

    "It's…it's…"

    "Now, listen to me," says the teacher, "If your sister has five apples, and you eat three of them…"

    "But I have no sisters." Jack says.

    "Oh, sorry. But do you have any brothers？"

    "Yes."

    "Now, if your brother has five apples, and you eat three of them, tell me now…？"

    "He'll certainly beat me," Jack says quickly.