win7 uefi启动:what room has no walls,o doors,no windows,and no floors?

What room has no walls，no doors，no windows and no head？是什么东西来的？ Brain Teasers:What room has no walls，no doors， no windows，and no one what room has no walls,o doors,no windows,and no floors? What table has no leg? 动脑筋（what kind of room has----） what has no beginging and no end what kind of dog has no tail What has an eye but no head? what has a neck but no throat what has a neck,but no head