选出恰当的句子,补全对话。 A. Are these carrots? B. Who is this man? C. Thirty-five. D. He's a farmer. E. Is this a dog? A: Look at the picture of my family B: 1____ A: He's my uncle B: What's your uncle? A: 2____ Look! It's his farm B: Wow! It's so big! 3____ A: Yes, they are B: 4____ A: No, it isn't. It's a mother pig B: How many pigs are there in his farm ? A: 5____