听下面一段材料,回答第1-3题。 1. For what purpose were dogs NOT used in the old days? A. Guarding chickens. B. Hunting other animals. C. Keeping thieves away. 2. Which of the following is true? A. Dogs still perform all the duties they used to do. B. Dogs are now treated as part of a family. C. Only old people are seen walking their dogs. 4. What is the speech mainly about? A. Reasons for keeping dogs. B. Dogs and other animals. C. What dogs can do now.