" According to the passage, which of the following is true?
The food dropped on the cement floor is not as safe as food dropped on the carpet within 30 seconds.
A toast dropped on the carpet is easier to be polluted than that dropped on the cement floor.
A sticky chocolate dropped on the carpet is easier to be polluted than that dropped on the cement floor within 5 seconds.
The food dropped on the carpet shares the same potential of being polluted with the food dropped on the cement floor.