PREVIEW
... uss each other excitedly.
The teacher named Xu took everyone inside.
First stopped in a public place on the first floor.
There are five floors in the school building, but there are no stairs.
There are three elevators on each side of the public places on the first floor.
Mr. Xu stopped by the elevator and introduced: "Every student will have their own card. The elevator is made by credit card. High-level can enter low-level floors, and low-level can only enter ...
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