1.When answering this question, consider the various challenges the government might face in replacing petrol cars with electric cars. These challenges could include the cost of infrastructure development, such as building charging stations, the economic impact on industries related to petrol cars, and the need for technological advancements in electric vehicles. 2.You can also discuss the social and environmental benefits of making this transition, such as reducing carbon emissions and pollution. Additionally, consider the role of government policies and incentives in encouraging the adoption of electric cars.

1. 在回答这个问题时，考虑政府在用电动车替代汽油车时可能面临的各种挑战。这些挑战可能包括基础设施建设的成本，例如建设充电站，与汽油车相关产业的经济影响，以及电动车技术进步的需求。 2. 你还可以讨论这一转变的社会和环境效益，比如减少碳排放和污染。此外，考虑政府政策和激励措施在促进电动车普及中的作用。