听短文,选择正确答案。
19. What should we do to enjoy our happy life?
A.Save food. | B.Eat healthily. | C.Both A and B. |
20. In order to save food, how many rules are mentioned (提到) in the passage?
21. How can we eat healthily?
A.Eat more junk food. | B.Eat less junk food. | C.Eat in restaurants. |