根据短文理解完成下列各题。
Shopkeeper: What can I do for you?
Mrs. Green: I'd like a sweater for my son.
Shopkeeper: What size do you want?
Mrs. Green: Size "L".
Shopkeeper: What colour do you like?
Mrs. Green: I like blue.
Shopkeeper: Which would you like, the woolen ones or the cotton ones?
Mrs. Green: I'll have a look at the cotton ones.
Shopkeeper: What about this one?
Mrs. Green: Oh! It's great. How much does it cost?
Shopkeeper: Fifty-five yuan.
Mrs. Green: Hmm. That's cheap. I'll take it.