Which of the following best describes the organization of this passage?？

• A、An exercise and its importance are explained．

• B、A problem is examined and solutions are given．

• C、Two different views of a problem are presented．

• D、Recent developments in medicine are described．
  

 假定你是中國文化知識大賽組委員會主席李華，寫信祝賀參賽選手John Smith獲得本次大賽一等獎，并通知其以下事項：
        1．出席1月10日晚在北京友誼賓館舉行的慶祝晚會。
        2．贏得了免費中國10日游。
        3．如果能夠參加旅游，應將信中所附表格填好，并準備好護照(passport)。組委會將負責其他相關事宜：
        注意：詞數應為100左右
        October l7th，2012
        Dear Mr．John Smith，
        ____________________________________________________________
        ______________________________________________________________
        Sincerely yours，
        Li Hua
        Chair
        Committee of the Chinese Culture Contest

He suddenly returned____a rainy night．

• A、at

• B、on
  

• C、in
  

• D、during