What was the most probable cause for Lisa’s weakness?

• A、She had run a long way．

• B、She felt hot in the subwav．

• C、She had done a lot of work．
  

• D、She had donated blood the night before．

 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

What is the main subject of the passage?

• A、How to beat a bad mood.

• B、How to talk bad moods out.

• C、How to do physical exercises.
  

• D、How to do aerobic exercise.