单选题：Introduction to letters to Sam Dear Reader, Please allow me

Introduction to letters to Sam Dear Reader, Please allow me to tell you something before you read this book. When my 36 ,Sam,was born , my heart was filled with joy . I had been sitting in a wheelchair for 20 years before then ,and I have been 37 ill many times . So I wondered if I would have the 38 to tell Sam what I had 39 . For years I have been hosting a program on the 40 and writing articles for a magazine . Being 41 to move freely , I have learned to sit still and keep my heart 42 , exchanging thoughts with thousands of listeners and 43 . So when Sam was born .I 44 to tell him about school and fridship , romance and work , love and everything else . That how I started to write these 45 , I hope that Sam would 46 them sooner or later . However , that expectation 47 when Sam showed aigns of autism (自闭症) at the age of two , He had actually stopped talking before the discovery of the signs . He 48 to communicate with others , even the family members . That was 49 for me but didn’t stop me writing on . I realized that I even 50 now to tell him . I wanted him to 51 what it means to be “diffenet” from others , and learn how to fight against the misfortune he’ll 52 as I myself .. his grandfather ,did ,I just 53 if I could write all that I wanted to say in the rest of my life . Now . 54 the book has been pubhshed . I have been given the chance , Every chapter in the book is a letter to Sam: some about my life .and all about what it means to be a 55 . Daniel Gottlied A.sonB. nephewC.brother D.grandson