从方框中选出恰当的句子完成下面对话。 A. I like blue. B. Oh! It's great.How much does it cost? C. I'd like a sweater for my son. D. Size 'L'. E. Hmm. That's cheap. I'll have it. F. Size 'L' A: What can I do for you? B: 1 A: What size do you want? B: 2 A: What color do you like? B: 3 A: Which would you prefer, the woolen ones or the cotton ones? B: 4 A: What about this one? B: 5 A: Fifty-five Yuan. B: 6