【正确答案】G. Leech has put forward the Politeness Principle which is almost universally acknowledged as a principle that governs conversation. According to Lecch, the PP consists of six maxims, namely, Tact Maxim, Generosity Maxim, Approbation Maxim, Modesty Maxim, Agreement Maxim, and Sympathy Maxim. In this note, Tom has applied the PP and clearly shows his politeness.
First of all, Tom uses "Dear Professor Wang" as the address term to show his respect and hence praise of the addressee, which conforms to the Approbation Maxim.
Secondly, "I'm writing to apologize for my failure to turn up for our appointment yesterday." is an apology that maximizes dispraise of self, that is, it conforms to the Modesty Maxim.
Thirdly, the expression "I wonder if it is possible for us to have another appointment sometime this weekend" is one to minimize cost to other and maximize cost to self, that is, it conforms to the Tact Maxim.
Finally, "Please pardon me" is a sentence of directive, which minimizes benefit to self. In this sense, it conforms to the Generosity Maxim.

【答案解析】[解析] 本题主要应当从礼貌原则入手，分析这则便条是如何遵守了礼貌原则中的准则的。答题时要先把什么是礼貌原则以及礼貌原则有哪些准则讲清楚，这样会方便后面的分析。