【正确答案】Dear Prof. Wang, First of all, please allow me to express my deep sorry for not being able to keep our appointment. I do know that this is very impolite and must have caused you much trouble. I do reckon that at present any explanation is pale and futile. However, I do not want you to misunderstand me. On my way to your office, an old lady suddenly fainted due to heart attack on the bus. I stopped a taxi and sent her into a nearby hospital. I stayed there until her son came, which spoiled our appointment. I am aware that our appointment is of importance. I do hope that you would be kind enough to spare your valuable time to meet me. I am looking forward to hearing from you. Yours sincerely, Li Ming

【答案解析】这篇文章属于应用文体写作。首先应注意信件的格式，其次注意信件的内容，最后要注意正文部分的写作层次。我们可以得知这是一封道歉信。信中第一段先进行道歉，接着说明原因，最后恳切邀请老师再约并回信。此外，要注意结尾和落款，语言要简洁明了，注意信件后面的写信人名字要写“Li Ming”。