1. Discuss both the cheapest and most expensive means of transport based on your knowledge or experience. 2. You can provide reasons why certain modes are cheaper or more expensive, considering factors like fuel efficiency, maintenance costs, or infrastructure requirements.

1. 根据你的知识或经验，讨论最便宜和最昂贵的交通方式。 2. 您可以提供某些交通方式更便宜或更昂贵的原因，考虑到燃油效率、维护成本或基础设施需求等因素。