<閱讀測驗>[題組:第44-47題]47. What is the last paragraph mainly about? (A) The origins and sizes of the signs in the Signpost Forest. (B) The quantity and variety of the signs in the Signpost Forest. (C) The difficulty of categorizing the signs in the Signpost Forest. (D) The practice of nailing illegal signs to the posts in the Signpost Forest.
