【答案解析】[参考范文]
To Whom It May Concern,
I"m one of those who live away from their hometowns and who will return home by train before the Spring Festival. I want to consult you about the ID-based ticket booking system.
The following information is essential for me. First, how many tickets can I buy at most under the new system? Second, do I have to provide detailed personal information if I buy tickets in groups? Third, I know that the system is effective in reducing the number of ticket scalpers, but is it possible that it will detain me long in the waiting room?
I would be grateful if it"s so kind of you to provide me with the above information. Thank you for your time and consideration. I"m waiting for your quick reply.
Sincerely yours,
Li Ming
[解析] 第一段表明写信的目的，即询问一些有关实名制购买火车票的问题；
第二段列举三个个问题：实行实名制购票后个人最多可以买几张票；若购买团体票，需不需要提供个人
详细信息；这种实名制会不会延长乘客候车的时间；
第三段表达谢意，并期待对方及时回复。