[交流] Funny English quiz in everyday（NO.29）

Previously
Q: Sometimes it looks like a boat. Sometimes it looks like a small white sun. What is it？

A:Moon.

Today’s Question
What room has no walls, no doors, no windows, and no floors?

We will hold this column everyday, the one who write the right answer first can earned 1 BB.
If u missed it this time, please come on and come here early, then use your smart head to find the answer.
I will give u the right answer in the column tomorrow.
So good luck to u!