猜谜语选择正确谜底填编号A stamp B blackboard C telephone D rain1 What is
猜谜语选择正确谜底填编号 A stamp B blackboard C telephone D rain 1 What is black when it is clean and white when it is dirty?( ) 2 What doesn't ask questions but needs to be answered?( ) 3 What travels around the world but always stays in the corner?( ) 4 What falls but never gets hurt?( )