An American manufacturer is showing his machine factory to a potential customer. At noon, when the lunch bell rings, two thousand men and women immediately stop working and leave the building.

　　“Your workers, they’re escaping!” cries the visitor. “You’ve got to stop them.”

　　“Don’t worry, they’ll be back,” says the American. And indeed, an exactly one 0’clock the bell rings again, and all the workers return from their break.

　　When the tour is over, the manufacturer turn s to his guest and says, “Well, now, which of these machines would you like to order?”

　　“Forget the machines,” says the visitor. “How much do you want for that bell?”

　　1.T 2.F 3.F 4.T 5.T