Which of the following statements indicate the significance of the appearance of chopsticks?

A.The use of chopsticks featured the coming of civilization to food culture.

B.The appearance of chopsticks indicated the scientific advancement in ancient China.

C.The use of chopsticks was a living example of the application of the lever principle of mechanics.

D.The appearance of chopsticks declared the discovery of a great scientific theory.

正确答案：The use of chopsticks featured the coming of civilization to food culture.；The use of chopsticks was a living example of the application of the lever principle of mechanics.