https://online2.tingclass.net/lesson/shi0529/10000/10090/foods05.mp3
https://image.tingclass.net/statics/js/2012
A: Why are some apples green and others red?
B: Won't the green ones turn red later?
A: No, I think they will always stay green.
B: Then they're just different kinds of apples.
A: But what makes them different?
B: Their genetics, I guess.
A: What if a long time ago someone colored apples red?
B: Then why are there green ones?
A: Because the painter made a mistake.
B: What do you think happened to that painter?
A: The apple queen probably chopped off his head.
B: I think you've seen Alice in Wonderland too many times.