听下面五段对话,选出问题的最佳答案。 ( ) 1. A. A teacher. B. A doctor. C. A worker. ( ) 2. A.Yellow and white. B. Red and yellow. C. Red and white. ( ) 3. A. On the chair. B. Under the chair. C. Under the desk. ( ) 4. A. Pork. B. Noodles. C. Rice. ( ) 5. A. Potatoes and tomatoes. B. Carrots and tomatoes. C. Carrots and potatoes.