听音选句。 (     )1.A. May I help you?                 B. Can I help you?             C. Could I help you? (     )2.A. How much is it?                 B. How many are they?      C. How much are they? (     )3.A. Where are you going?        B. What are you doing? C. What are you talking about? (     )4.A. I often go out for dinner with my family. B. I often go out for dinner with my friends. C. I go out for dinner on Friday. (     )5.A. My father is surfing the net and my mother is cooking. B. My mother is surfing the net and my father is cooking. C. My father is reading and my mother is cooking.