【正确答案】[参考范文]
Dear Mr. and Mrs. Brown，
Thanks so much for taking care of me during my stay in London．I would avail myself of this opportunity to express my great appreciation for your timely help and assistance when in need．
Your house is really spectacular，and I enjoyed it so much．I thoroughly enjoyed your hospitality．What's more，Mrs．Brown．your cooking is out of the world and beyond my words．You made me feel at ease during my studies in London．I really cherish the memories of those days with you two．
It could be great getting together with you two once again．I sincerely hope you would come to China and I will be your guide．
Best wishes to you!
Yours，
Li Ming

【答案解析】[破题谋篇]
从本题的信息可看出，这里要求考生写一封感谢信。这封信写给一对外国夫妇，感谢他们对自己在国外学习期间的照顾，并邀请他们来中国做客。感谢信是表达自己的感激之情，因此．语言上要热情，发自内心。本文可分为三段来写：第一段表达感激之情；第二段，即文章主体部分，写感谢的原因；第三段邀请对方来中国做客。
本题给出的信息是写信的对象(the Browns)和写信的原因(to express your gratitude)。
[范文点评]
此信为典型的感谢信模式。通常这类信要提及他人的帮助对写信人所产生的积极影响，这也是感谢信中不可缺少的部分。此信写给布朗夫妇，所以信件称呼明确写Dear Mr．and Mrs．Brown。
第一段开门见山说明写信的理由，言简意赅。
第二段具体描述在哪些方面感谢对方，思路清晰。
第三段发出邀请，希望他们来中国。信函的结尾处使用了常规的致谢和期盼用语，以示礼貌。