听材料,回答小题。
18. When did the activity start in Northern Ireland?
A.In 2012. | B.In 2017. | C.In 2021 |
19. What does one organizer advise people to do?
A.To buy a bike for their children. |
B.To teach their children traffic rules. |
C.To walk to school with their children. |
20. What does the speaker mainly talk about?
A.Road safety. | B.Green Travel. | C.Healthy habits. |