请听下面一段材料,回答第1至4题。 1. What's the talk mainly about? A. Reading. B. Travelling. C. History. 2. What does the speaker compare books to? A. Close friends. B. Experienced teachers. C. Food for the mind. 3. Who wrote the book Uncle Tom's Cabin? A. Harriet Stowe. B. John Quincy. C. Rachel Carson. 4. What kind of book did John Adams's son carry with him? A. A history book. B. A poetry book. C. A dictionary.