题目

It was a sunny day. A city man was driving along a country road with a new wagon（马车）and a beautiful pair of horses. He didn’t pay a lot of  16  to where he was going. Pretty soon he  17_ that he was lost, but he continued to drive, expecting to re-find his way or to  18  someone who could tell him how to get back to the  19  .     It was a long  20  road. For many __21__ he kept on driving. When it was almost  dark ，he saw in a field a tall  22   ploughing（犁地） the land. He stopped his   23  team of horses near the fence and called out如图，已知长方形ABCD中AB = 8cm，BC = 10cm，在边CD上取一点E，将△ADE折叠，使点D恰好落在BC边上的点F，则CF的长为（ ）A. 2cm B. 3cm C. 4cm D. 5cm