问题描述：
猜谜（In English）
1.In this room,there is no door or floor.But this white room has only one wall.And in this room,we can see a nice yellow ball.It's an______
2.What is the smallest room in the world.It's a_________
1.In this room,there is no door or floor.But this white room has only one wall.And in this room,we can see a nice yellow ball.It's an______
2.What is the smallest room in the world.It's a_________
问题解答：
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