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.