设计任务：阅读下面学生信息和语言素材，设计20分钟的英语写作教学方案。
教案没有固定格式，但必须包含下列要点：
·teaching objectives
·teaching contents
·key and difficult points
·major steps and time allocation
· activities and justifications
教学时间：20分钟
学生概况：某城镇普通中学高中一年级学生，班级人数40人。多数学生已经达到《普通高中英语课程标准(实验)》五级水平。学生课堂参与积极性一般。
语言素材：
Dear Zhou Kai,
How are you? We? re doing a class survey and I have to write emails to all my pen friends in other countries. I hope you don? t mind answering these questions.
1 Do most adults smoke in China?
2 In most states in the US, it is now against the law to smoke in public buildings, such as banks and offices, on public transport and in restaurants and cafes. Is it the same in China?
3 Is the government planning to change the law about smoking in public?
Hope you can answer my three questions!
Best wishes,
Paul