单项选择题
A．for at least five years B．for ten years C．for as long as you take good care of them D．for your whole life
A．they should change their taste B．it is difficult to find a repair shop C．they will spend less money buying a new object than repairing an old one D．industrial products will be out of style too soon
A．teens never left their families B．teens often left their parents C．teens never went to school D．teens never make friends with each other