阅读理解。 Bobby is Mr Brown's young son. Mr Brown loves him very much. Now he's talking to his friend about Bobby. 'The boy is only two years old.' Mr Brown says. 'And he knows all animals. He is going to be a great naturalist (他将成为一个伟大的自然科学家). Here, let me show you.' He takes a book, puts Bobby on his knee (膝盖), opens the book and shows him a picture of a giraffe(长颈鹿). 'What's this, Bobby?' 'Horse.' Bobby answers (回答). Mr Brown shows a picture of a lion, and Bobby says, 'Dog.' Then Mr Brown shows him a picture of a chimpanzee (大猩猩), Bobby  says, 'Dad.' 阅读短文，选择正确的答案。 1. Bobby is Mr Brown's _____. A. friend B. son C. daughter D. father 2. Bobby is _____. A. two B. three C. four D. five 3. Now Mr Brown is talking to _____ about his young son. A. his friend B. his sons C. his mother D. his teachers 4. Mr Brown says Bobby is going to be a _____. A. teacher B. doctor C. student D. naturalist