阅读理解。 Many people like animals. Now a lot of people keep animals as pets. Usually people like to keep dogs, cats, fish and other animals. Many young people keep animals because they think these animals are interesting. Some old people keep pets because they don't live with their children. Molly lives on No. 25 Garden Street.  He is a doctor, but he helps dogs. People usually call him the Dog Doctor. When their dogs are ill, they call him on the telephone.  He goes to the people's houses and helps them. He gives the dogs the right medicine (药物). Wherever (无论) he goes, he is always welcome. 1. What kind of animals do people keep? A. Dogs. B. Cats. C. Fish. D. All of the above. 2. Why do old people keep pets? A. Because they think animals are interesting. B. Because they don't have children. C. Because they don't like living with their children. D. Because they feel lonely (感到孤单). 3. Molly is____. A. a doctor B. a teacher C. a worker D. a farmer 4. Which of the following sentences is NOT true? A. Molly lives on Garden Street. B. Molly can help all animals. C. He is a dog doctor. D. Molly is always welcome. 5. What is the best title? A. Pets and Doctors B. A New Pet Store C. A Dog Doctor D. An Interesting Animal