答案:
【The art room is on the second floor.】才对
on the second floor 第二楼
序数词second前面要用定冠词the.
说到第几楼要用序数词而不是基数词.
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The art room is on the floor two .
或者
The art room is on the 2nd floor.
The art room is on the second floor.
美术教室在二楼。
two改成序数词,second
two 错了,这里应该用序数词 second
不能用基数词two.用序数词second