The speaker attracted the audience at the very beginning of the lecture by giving a ______description of his personal experience.

A．stationed
B．perched
C．placed
D．deposited

A．it suggested a way to keep some foods fresh without preservatives
B．it discovered tiny globules in both cream and butut
C．it revealed the secret of how bacteria multiply in cream and butter
D．it found that cream and butter share the same chemical composition